From akrherz at iastate.edu Fri Jul 1 11:00:48 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Fri, 1 Jul 2011 11:00:48 -0500 Subject: IEM Daily Bulletin Message-ID: <201107011600.p61G0mtg025612@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 01 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-06-30 | Title : Summer humidity | Date : 30 Jun 05:52 AM | Votes : Good: 16 Bad: 2 +---------------------------------------------- The past few days have seen a respite from the summer like dew points near 70, but that will change today with very warm and humid air set to arrive with high temperatures well into the 90s. The featured chart presents the dew point values reported by the Ames Airport sensor since the first of the month. We have not had many extended periods above 70 degrees and a number of days below 60. The field crops have yet to get to their intensive transpiration periods yet, which is a big source of humidity in the summertime in Iowa. > NWS Watch/Warning Summary for 30 Jun 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 0 0 | 0 0 0 0 0 | 0 Svr Tstorm 113 0 | 0 0 0 0 3 | 5 Fl Flood 3 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 113 Verified: 56 [49.6 %] Reduction of Size Versus County Based [76.6 %] Average Perimeter Ratio [19.0 %] Percentage of Warned Area Verified (15km) [17.4 %] Average Storm Based Warning Size [2168 sq km] Probability of Detection(higher is better)[0.80] False Alarm Ratio (lower is better) [0.50] Critical Success Index (higher is better) [0.44] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Sat Jul 2 11:00:28 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Sat, 2 Jul 2011 11:00:28 -0500 Subject: IEM Daily Bulletin Message-ID: <201107021600.p62G0Sbe028652@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 02 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-01 | Title : Getting to 100 | Date : 01 Jul 05:20 AM | Votes : Good: 16 Bad: 2 +---------------------------------------------- Temperatures soared on Thursday well into the 90s. Dew point temperatures were in the mid to upper 70s as well making for a miserable time outside. The featured chart presents some details on the days when the temperature has reached 100+ degrees for Des Moines. The top chart shows the morning low temperature on the days when the temperature topped 100 and the bottom chart shows the times during the afternoon that 100+ degrees were reported. Low temperatures are typically in the mid to upper 70s and the warmest temperatures occur during the mid afternoon. > NWS Watch/Warning Summary for 01 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 7 0 | 0 0 0 0 3 | 0 Svr Tstorm 119 11 | 10 0 13 0 12 | 2 Fl Flood 9 0 | 0 0 0 0 2 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 126 Verified: 79 [62.7 %] Reduction of Size Versus County Based [60.7 %] Average Perimeter Ratio [14.8 %] Percentage of Warned Area Verified (15km) [23.6 %] Average Storm Based Warning Size [2638 sq km] Probability of Detection(higher is better)[0.85] False Alarm Ratio (lower is better) [0.37] Critical Success Index (higher is better) [0.56] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Sun Jul 3 11:00:38 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Sun, 3 Jul 2011 11:00:38 -0500 Subject: IEM Daily Bulletin Message-ID: <201107031600.p63G0cQ1023589@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 03 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-02 | Title : 100 composite | Date : 02 Jul 04:45 PM | Votes : Good: 7 Bad: 1 +---------------------------------------------- The featured chart presents the daily temperature time series for each day the Des Moines Airport sensor was over 100 degrees. The blue lines in the plot indicate days on which rainfall was also reported. Having rainfall on 100 degree days is rather rare, which is probably an indication of having very warm air overhead that prevents thunderstorms from forming while helping to rapidly warm our temperatures. > NWS Watch/Warning Summary for 02 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 19 0 | 0 0 0 0 0 | 1 Svr Tstorm 196 0 | 0 0 0 0 0 | 4 Fl Flood 21 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 215 Verified: 92 [42.8 %] Reduction of Size Versus County Based [79.4 %] Average Perimeter Ratio [28.2 %] Percentage of Warned Area Verified (15km) [19.9 %] Average Storm Based Warning Size [1232 sq km] Probability of Detection(higher is better)[0.82] False Alarm Ratio (lower is better) [0.57] Critical Success Index (higher is better) [0.39] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Mon Jul 4 11:00:33 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Mon, 4 Jul 2011 11:00:33 -0500 Subject: IEM Daily Bulletin Message-ID: <201107041600.p64G0X3i019275@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 04 July 2011 > News No news is good news > Daily Feature No feature posted > NWS Watch/Warning Summary for 03 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 0 0 | 0 0 0 0 0 | 0 Svr Tstorm 181 0 | 0 0 0 0 0 | 5 Fl Flood 19 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 181 Verified: 79 [43.6 %] Reduction of Size Versus County Based [76.9 %] Average Perimeter Ratio [30.7 %] Percentage of Warned Area Verified (15km) [13.8 %] Average Storm Based Warning Size [1701 sq km] Probability of Detection(higher is better)[0.71] False Alarm Ratio (lower is better) [0.56] Critical Success Index (higher is better) [0.37] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Tue Jul 5 11:01:04 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Tue, 5 Jul 2011 11:01:04 -0500 Subject: IEM Daily Bulletin Message-ID: <201107051601.p65G14pe004379@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 05 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-04 | Title : Looking good for fireworks | Date : 04 Jul 04:42 PM | Votes : Good: 3 Bad: 2 +---------------------------------------------- The fourth of July has been a spectacular day in Iowa with warm temperatures and pleasant humidities. The featured satellite image only shows a few clouds over southwestern Iowa. Looks to be a great evening for fireworks in Iowa. > NWS Watch/Warning Summary for 04 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 8 0 | 0 0 0 0 0 | 0 Svr Tstorm 282 0 | 0 0 0 0 0 | 7 Fl Flood 38 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 290 Verified: 176 [60.7 %] Reduction of Size Versus County Based [76.5 %] Average Perimeter Ratio [21.9 %] Percentage of Warned Area Verified (15km) [20.2 %] Average Storm Based Warning Size [1673 sq km] Probability of Detection(higher is better)[0.82] False Alarm Ratio (lower is better) [0.39] Critical Success Index (higher is better) [0.54] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Wed Jul 6 11:00:38 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Wed, 6 Jul 2011 11:00:38 -0500 Subject: IEM Daily Bulletin Message-ID: <201107061600.p66G0cxK031032@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 06 July 2011 > News +---------------------------------------------- | Title : Top10 Warning Sizes | Date : 05 Jul 02:21 PM | Author: Daryl Herzmann | URL : http://mesonet.agron.iastate.edu/cow/top10.phtml +----------------------------------------------

I've added a simple page printing out the top 10 biggest and smallest storm based warnings issued by the National Weather Service. You can see just the top 10 for this year and limit the listing on a per weather forecast office basis. The IEM maintains an unique collection of these warnings and often gets requests for summary information like this. +---------------------------------------------- | Title : Improved Climate Download | Date : 05 Jul 01:20 PM | Author: Daryl Herzmann | URL : http://mesonet.agron.iastate.edu/COOP/dl/normals.phtml +----------------------------------------------

I have improved the daily climate data download application to allow the user to select which climate dataset they wish to download from. The current climate dataset is about to change from the 1971-2000 period to 1981-2010 period with the release of the new climate normals from the National Climatic Data Center. The IEM has a preliminary estimate of that dataset along with normals for other periods that you can select from. > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-05 | Title : On track with GDDs | Date : 05 Jul 05:45 AM | Votes : Good: 16 Bad: 1 +---------------------------------------------- This growing season has seen its share of warm and cool weather, but the result has been an average accumulation of growing degree days. The shortened work week ahead looks to be about average as well with a good bit of sunshine. Have you taken the opportunity to go listen to and watch the corn grow? :) > NWS Watch/Warning Summary for 05 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 2 1 | 0 0 1 0 0 | 1 Svr Tstorm 144 5 | 2 0 5 7 0 | 4 Fl Flood 34 0 | 0 0 0 1 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 139 Verified: 67 [48.2 %] Reduction of Size Versus County Based [85.8 %] Average Perimeter Ratio [21.8 %] Percentage of Warned Area Verified (15km) [19.3 %] Average Storm Based Warning Size [1508 sq km] Probability of Detection(higher is better)[0.80] False Alarm Ratio (lower is better) [0.52] Critical Success Index (higher is better) [0.43] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Thu Jul 7 11:00:44 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Thu, 7 Jul 2011 11:00:44 -0500 Subject: IEM Daily Bulletin Message-ID: <201107071600.p67G0iCW017096@despam-10.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 07 July 2011 > News +---------------------------------------------- | Title : Jun ASOS Data Uploaded | Date : 07 Jul 09:39 AM | Author: Daryl Herzmann | URL : http://mesonet.agron.iastate.edu/request/asos/1min.phtml +----------------------------------------------

The one minute interval Iowa ASOS data for June has been uploaded to the IEM data coffers. Data for Moline, Sioux Falls, and Omaha are included as well. Enjoy. > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-06 | Title : Severe Storm Motions | Date : 06 Jul 05:40 AM | Votes : Good: 16 Bad: 2 +---------------------------------------------- A severe thunderstorm developed over northcentral Iowa Tuesday afternoon and marched mostly south. This storm motion is not what we typically expect in Iowa of west to east moving storms. When the NWS issues severe thunderstorm warnings, they include a storm motion. The featured chart summarizes these storm motions issued by NWS offices with jurisdiction over Iowa. The upper chart presents a comparison between storm direction and date of year. It shows the favored direction of travel from the southwest in June to more west- northwesterly in July. The bottom chart compares storm speed with direction of travel. The fastest storms are clearly from the southwest with the largest concentration around 30 knots from the west. So our storms from the north-northwest on Tuesday are a bit rare, but not nearly unheard of like storms travelling from the east to west! > NWS Watch/Warning Summary for 06 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 1 0 | 0 0 0 0 0 | 0 Svr Tstorm 156 0 | 0 0 0 0 0 | 3 Fl Flood 39 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 156 Verified: 82 [52.6 %] Reduction of Size Versus County Based [81.0 %] Average Perimeter Ratio [18.1 %] Percentage of Warned Area Verified (15km) [20.4 %] Average Storm Based Warning Size [1902 sq km] Probability of Detection(higher is better)[0.87] False Alarm Ratio (lower is better) [0.47] Critical Success Index (higher is better) [0.49] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Fri Jul 8 11:00:27 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Fri, 8 Jul 2011 11:00:27 -0500 Subject: IEM Daily Bulletin Message-ID: <201107081600.p68G0Rl4005756@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 08 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-07 | Title : Right Turners | Date : 07 Jul 05:43 AM | Votes : Good: 12 Bad: 5 +---------------------------------------------- Following up on yesterday's feature, today's looks at a comparison of tornado warned storm motion versus the severe thunderstorm warnings near in both space in time. Sometimes the sign of a storm that can produce a tornado is when the storm's path deviates from others around it. Typically, this deviation is a slight turn to the right (called right turners). Based on forecasted storm motions, just slightly more than half of the storms exhibit some bit of right turning. Another aspect to "right turners" is a decrease in speed as the storm's circulation strengthens. Again, just over half have forecasted speeds below those of warned severe thunderstorms around it. This is by no means an exhaustive look at this topic, but hopefully an interesting chart nonetheless. The bottom chart does contain an interesting dual maximum (25kts and 40kts) that may be a sign of a separation between isolated supercells (slower speeds) with linear convective complexes (typically faster moving). > NWS Watch/Warning Summary for 07 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 2 0 | 0 0 0 0 0 | 0 Svr Tstorm 108 0 | 0 0 0 0 0 | 2 Fl Flood 51 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 110 Verified: 39 [35.5 %] Reduction of Size Versus County Based [86.3 %] Average Perimeter Ratio [22.4 %] Percentage of Warned Area Verified (15km) [13.6 %] Average Storm Based Warning Size [1468 sq km] Probability of Detection(higher is better)[0.68] False Alarm Ratio (lower is better) [0.65] Critical Success Index (higher is better) [0.30] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Sat Jul 9 11:00:42 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Sat, 9 Jul 2011 11:00:42 -0500 Subject: IEM Daily Bulletin Message-ID: <201107091600.p69G0gni004285@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 09 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-08 | Title : Barely any wind | Date : 08 Jul 04:14 AM | Votes : Good: 11 Bad: 3 +---------------------------------------------- The past five days have seen not much wind to speak of with daily average values for Ames in the 2-4 mph range. The featured chart presents the daily average wind speed since the first of June. The third of July was one of the least windy for the entire year. The forecast does increase our wind speeds along with more chances of rain. > NWS Watch/Warning Summary for 08 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 23 0 | 0 0 0 0 0 | 2 Svr Tstorm 117 0 | 0 0 0 0 0 | 2 Fl Flood 47 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 140 Verified: 42 [30.0 %] Reduction of Size Versus County Based [80.0 %] Average Perimeter Ratio [18.5 %] Percentage of Warned Area Verified (15km) [9.7 %] Average Storm Based Warning Size [1784 sq km] Probability of Detection(higher is better)[0.75] False Alarm Ratio (lower is better) [0.70] Critical Success Index (higher is better) [0.27] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Sun Jul 10 11:00:12 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Sun, 10 Jul 2011 11:00:12 -0500 Subject: IEM Daily Bulletin Message-ID: <201107101600.p6AG0Csu015297@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 10 July 2011 > News No news is good news > Daily Feature No feature posted > NWS Watch/Warning Summary for 09 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 3 0 | 0 0 0 0 0 | 0 Svr Tstorm 54 0 | 0 0 0 0 1 | 2 Fl Flood 14 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 57 Verified: 24 [42.1 %] Reduction of Size Versus County Based [85.5 %] Average Perimeter Ratio [14.7 %] Percentage of Warned Area Verified (15km) [13.2 %] Average Storm Based Warning Size [1752 sq km] Probability of Detection(higher is better)[0.71] False Alarm Ratio (lower is better) [0.58] Critical Success Index (higher is better) [0.36] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Mon Jul 11 11:00:32 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Mon, 11 Jul 2011 11:00:32 -0500 Subject: IEM Daily Bulletin Message-ID: <201107111600.p6BG0WEu000355@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 11 July 2011 > News No news is good news > Daily Feature No feature posted > NWS Watch/Warning Summary for 10 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 21 0 | 0 0 0 0 0 | 1 Svr Tstorm 137 0 | 2 0 0 4 7 | 6 Fl Flood 13 0 | 0 0 0 0 1 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 158 Verified: 80 [50.6 %] Reduction of Size Versus County Based [74.3 %] Average Perimeter Ratio [21.6 %] Percentage of Warned Area Verified (15km) [17.6 %] Average Storm Based Warning Size [2410 sq km] Probability of Detection(higher is better)[0.86] False Alarm Ratio (lower is better) [0.49] Critical Success Index (higher is better) [0.47] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Tue Jul 12 11:00:43 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Tue, 12 Jul 2011 11:00:43 -0500 Subject: IEM Daily Bulletin Message-ID: <201107121600.p6CG0hiR028322@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 12 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-11 | Title : 7-11 unlucky for some | Date : 11 Jul 06:29 AM | Votes : Good: 20 Bad: 4 +---------------------------------------------- The damage reports are rolling in after a powerful storm system plowed through Iowa early this Monday morning. The hardest hit areas are from north of Des Moines to Dubuque as shown by the summary of local storm reports from the NWS. Some of the damage reported this morning is significant from winds probably upwards of 100 mph. > NWS Watch/Warning Summary for 11 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 9 2 | 0 0 2 0 0 | 1 Svr Tstorm 242 15 | 3 6 10 2 10 | 13 Fl Flood 19 0 | 0 0 0 0 1 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 245 Verified: 143 [58.4 %] Reduction of Size Versus County Based [64.9 %] Average Perimeter Ratio [19.2 %] Percentage of Warned Area Verified (15km) [24.7 %] Average Storm Based Warning Size [2501 sq km] Probability of Detection(higher is better)[0.84] False Alarm Ratio (lower is better) [0.42] Critical Success Index (higher is better) [0.52] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Wed Jul 13 11:00:27 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Wed, 13 Jul 2011 11:00:27 -0500 Subject: IEM Daily Bulletin Message-ID: <201107131600.p6DG0RC7012308@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 13 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-12 | Title : Tornado Watches and wind | Date : 12 Jul 06:19 AM | Votes : Good: 17 Bad: 9 +---------------------------------------------- The featured chart presents an analysis of averaged surface wind speed and direction over the domain of a Storm Prediction Center issued tornado watch that was centered over Iowa. The wind values are for a period near issuance. The symbols represent the number of tornadoes reported within the watch box. The plot nicely shows that winds from the southeast to southwest are the most common with a sharp cutoff at the southwest direction. Tornadoes form in environments of wind sheer where wind speeds and/or direction change with increasing height in the atmosphere. So having surface winds out of the southeast and upper level winds out of the west provide the sheared environment in Iowa. > NWS Watch/Warning Summary for 12 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 12 0 | 0 0 0 0 0 | 0 Svr Tstorm 133 0 | 0 0 0 0 0 | 2 Fl Flood 57 0 | 0 0 0 0 1 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 144 Verified: 49 [34.0 %] Reduction of Size Versus County Based [79.7 %] Average Perimeter Ratio [28.6 %] Percentage of Warned Area Verified (15km) [17.3 %] Average Storm Based Warning Size [1123 sq km] Probability of Detection(higher is better)[0.68] False Alarm Ratio (lower is better) [0.66] Critical Success Index (higher is better) [0.29] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Thu Jul 14 11:00:45 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Thu, 14 Jul 2011 11:00:45 -0500 Subject: IEM Daily Bulletin Message-ID: <201107141600.p6EG0j8F026307@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 14 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-13 | Title : Ground Clutter | Date : 13 Jul 08:07 AM | Votes : Good: 13 Bad: 1 +---------------------------------------------- The cleanup continues from the high wind event on Monday morning. The featured title typically refers to having the radar beam hitting objects on the ground, but in this case the actual radar hit the ground. WHO-TV (of Des Moines) had their radar blown off its tower by the storms Monday morning. The photo is of their RADAR radar dish on the ground. Earlier this year, WAFF-TV's (of Huntsville, AL) radar was destroyed by storms there. > NWS Watch/Warning Summary for 13 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 5 0 | 0 0 0 0 0 | 1 Svr Tstorm 219 0 | 0 0 0 0 0 | 3 Fl Flood 30 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 225 Verified: 110 [48.9 %] Reduction of Size Versus County Based [78.5 %] Average Perimeter Ratio [27.4 %] Percentage of Warned Area Verified (15km) [20.7 %] Average Storm Based Warning Size [1361 sq km] Probability of Detection(higher is better)[0.75] False Alarm Ratio (lower is better) [0.51] Critical Success Index (higher is better) [0.42] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Fri Jul 15 11:00:21 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Fri, 15 Jul 2011 11:00:21 -0500 Subject: IEM Daily Bulletin Message-ID: <201107151600.p6FG0L2A009476@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 15 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-14 | Title : Continued dry for July | Date : 14 Jul 07:03 AM | Votes : Good: 9 Bad: 11 +---------------------------------------------- The featured chart presents daily precipitation totals and the departures from average for the Cedar Rapids Airport sensor. Rainfall this month has been not been widespread and most of eastern Iowa has missed out on the heavier events. There are more chances of rain in the forecast, but this weekend looks to start a very hot and dry period in the state. > NWS Watch/Warning Summary for 14 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 2 0 | 0 0 0 0 0 | 1 Svr Tstorm 81 0 | 0 0 0 0 0 | 3 Fl Flood 27 0 | 0 0 0 0 2 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 81 Verified: 36 [44.4 %] Reduction of Size Versus County Based [80.6 %] Average Perimeter Ratio [21.9 %] Percentage of Warned Area Verified (15km) [15.4 %] Average Storm Based Warning Size [1897 sq km] Probability of Detection(higher is better)[0.72] False Alarm Ratio (lower is better) [0.56] Critical Success Index (higher is better) [0.38] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Sat Jul 16 11:00:17 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Sat, 16 Jul 2011 11:00:17 -0500 Subject: IEM Daily Bulletin Message-ID: <201107161600.p6GG0HdM007390@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 16 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-15 | Title : More hot hours ahead | Date : 15 Jul 03:30 PM | Votes : Good: 5 Bad: 9 +---------------------------------------------- The big story is the forecasted upcoming hot weather to begin this weekend and last into at least next week. The featured chart presents the number of hours per year that the heat index was observed to be at or above 100 degrees at the Des Moines sensor. The 2011 total is already above four of the past seven years. This weather will be right on time for the climatological warmest week of the year as well. > NWS Watch/Warning Summary for 15 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 3 0 | 0 0 0 0 0 | 0 Svr Tstorm 70 0 | 3 0 2 2 0 | 3 Fl Flood 22 1 | 3 0 2 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 73 Verified: 29 [39.7 %] Reduction of Size Versus County Based [71.8 %] Average Perimeter Ratio [25.9 %] Percentage of Warned Area Verified (15km) [11.3 %] Average Storm Based Warning Size [2225 sq km] Probability of Detection(higher is better)[0.82] False Alarm Ratio (lower is better) [0.60] Critical Success Index (higher is better) [0.37] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Sun Jul 17 11:00:20 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Sun, 17 Jul 2011 11:00:20 -0500 Subject: IEM Daily Bulletin Message-ID: <201107171600.p6HG0K36028557@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 17 July 2011 > News No news is good news > Daily Feature No feature posted > NWS Watch/Warning Summary for 16 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 17 0 | 0 0 0 0 0 | 1 Svr Tstorm 57 0 | 0 0 0 0 0 | 0 Fl Flood 15 2 | 0 0 1 1 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 72 Verified: 26 [36.1 %] Reduction of Size Versus County Based [81.8 %] Average Perimeter Ratio [16.5 %] Percentage of Warned Area Verified (15km) [11.8 %] Average Storm Based Warning Size [2148 sq km] Probability of Detection(higher is better)[0.64] False Alarm Ratio (lower is better) [0.64] Critical Success Index (higher is better) [0.30] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Mon Jul 18 11:00:18 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Mon, 18 Jul 2011 11:00:18 -0500 Subject: IEM Daily Bulletin Message-ID: <201107181600.p6IG0IRr027525@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 18 July 2011 > News No news is good news > Daily Feature No feature posted > NWS Watch/Warning Summary for 17 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 22 0 | 0 0 0 0 0 | 2 Svr Tstorm 64 0 | 1 0 0 0 0 | 4 Fl Flood 11 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 84 Verified: 39 [46.4 %] Reduction of Size Versus County Based [68.9 %] Average Perimeter Ratio [21.5 %] Percentage of Warned Area Verified (15km) [19.1 %] Average Storm Based Warning Size [2612 sq km] Probability of Detection(higher is better)[0.89] False Alarm Ratio (lower is better) [0.54] Critical Success Index (higher is better) [0.44] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Tue Jul 19 11:01:23 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Tue, 19 Jul 2011 11:01:23 -0500 Subject: IEM Daily Bulletin Message-ID: <201107191601.p6JG1NhA010612@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 19 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-18 | Title : It is that time of year | Date : 18 Jul 05:57 AM | Votes : Good: 14 Bad: 6 +---------------------------------------------- Heat index values soared to well over 100 degrees this past weekend thanks to highs in the 90s and dew point readings in the upper 70s and lower 80s. The featured chart presents frequency of having a 100+ heat index by hour and week of the year based on observations from the Des Moines sensor. The bullseye is right about now, the third week of July which is also the warmest week of the year. The very hot weather looks to continue this week. > NWS Watch/Warning Summary for 18 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 8 0 | 0 0 0 0 0 | 0 Svr Tstorm 88 0 | 2 0 0 0 0 | 6 Fl Flood 16 0 | 3 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 95 Verified: 54 [56.8 %] Reduction of Size Versus County Based [71.4 %] Average Perimeter Ratio [17.1 %] Percentage of Warned Area Verified (15km) [23.6 %] Average Storm Based Warning Size [1544 sq km] Probability of Detection(higher is better)[0.81] False Alarm Ratio (lower is better) [0.43] Critical Success Index (higher is better) [0.50] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Wed Jul 20 11:00:34 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Wed, 20 Jul 2011 11:00:34 -0500 Subject: IEM Daily Bulletin Message-ID: <201107201600.p6KG0Y4E010785@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 20 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-19 | Title : Streaks of 90+ | Date : 19 Jul 05:53 AM | Votes : Good: 10 Bad: 6 +---------------------------------------------- Yesterday was another very hot day in Iowa with high temperatures nearing 100 degrees. It was the fourth day in a row with a high temperature over 90 for Ames. The featured chart presents the yearly maximum daily streak over 90 degrees for high temperature for Ames. Some years, like 2004, the temperature never got that warm for the entire year! Our current streak has a chance of being the longest we have seen in around 20 years. > NWS Watch/Warning Summary for 19 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 7 0 | 2 0 0 0 0 | 0 Svr Tstorm 112 0 | 5 0 0 0 0 | 3 Fl Flood 30 0 | 2 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 119 Verified: 56 [47.1 %] Reduction of Size Versus County Based [74.7 %] Average Perimeter Ratio [19.8 %] Percentage of Warned Area Verified (15km) [20.2 %] Average Storm Based Warning Size [1780 sq km] Probability of Detection(higher is better)[0.82] False Alarm Ratio (lower is better) [0.53] Critical Success Index (higher is better) [0.43] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Thu Jul 21 11:00:28 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Thu, 21 Jul 2011 11:00:28 -0500 Subject: IEM Daily Bulletin Message-ID: <201107211600.p6LG0SEv025527@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 21 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-20 | Title : July comparison | Date : 20 Jul 05:55 AM | Votes : Good: 13 Bad: 4 +---------------------------------------------- The featured chart presents an hourly climatology of temperature, heat index, and humidity (mixing ratio) in July for Ames along with the observations from Monday. The mixing ratio is a measure of the amount of water within a unit mass of dry air. The top chart shows average mixing ratios in the 12-14 range, whereas observations on Monday were in the 19-24 range (blue line). Notice what happens in the last afternoon around 6 PM. While the air temperature was flat for the afternoon, humidity levels kept rising and pushed the heat index well above 110 degrees. This effect was probably heavily influenced by all of the corn transpiring water throughout the day. The hot and muggy weather will continue today. > NWS Watch/Warning Summary for 20 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 5 0 | 0 0 0 0 0 | 0 Svr Tstorm 43 0 | 0 0 0 0 0 | 1 Fl Flood 7 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 48 Verified: 23 [47.9 %] Reduction of Size Versus County Based [75.8 %] Average Perimeter Ratio [19.1 %] Percentage of Warned Area Verified (15km) [15.7 %] Average Storm Based Warning Size [2405 sq km] Probability of Detection(higher is better)[0.78] False Alarm Ratio (lower is better) [0.52] Critical Success Index (higher is better) [0.42] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Fri Jul 22 11:00:13 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Fri, 22 Jul 2011 11:00:13 -0500 Subject: IEM Daily Bulletin Message-ID: <201107221600.p6MG0DJ7026011@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 22 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-21 | Title : Unreliable Dew Points | Date : 21 Jul 12:33 AM | Votes : Good: 54 Bad: 5 +---------------------------------------------- Our recent stretch of extremely hot and muggy weather has gotten Iowa a bit of publicity as some of our automated stations have calculated heat indexes that exceeded 130 degrees! Typically, this is blamed on the abundant transpiring corn crop in the state, but that is not the entire story. The primary source of automated weather data in the state are located at airports, but there are two classes of instruments. The federally administered ASOS sites have higher quality and sometimes different sensors than their state run AWOS counterparts. Unfortunately, their data is typically thrown together in the same pot and reported as such. While the ASOS sites did indicate gaudy heat indexes exceeding 110 at times, they were not as high as the AWOS sites which got all the headlines. The featured chart presents a comparison of an ASOS and AWOS site separated by 30 some miles and both surrounded by farm fields. The bottom plot raises the most doubt as even while visibilities were at 2-4 miles, relative humidity was just 75% at the AWOS site and near 100% at the ASOS site. This is probably an indication that the AWOS air temperature has a warm bias. The second plot shows another issue of having the AWOS dew point rise dramatically during the morning hours at a much higher rate than the ASOS site. It is hard to imagine a natural process that could be putting that much water into the atmosphere in the early morning hours. The first plot of the ASOS site shows a reasonable depiction of transpiring corn (slowly rising dew point throughout the day peaking late afternoon coinciding with plant transpiration), but the dew point temperature barely gets to 80 degrees which keeps the calculated heat index at reasonable values. The moral of the story is that not all automated sensors are alike and while heat indexes over 110 surely were felt in Iowa these past days, the high end values over 120 are questionable. > NWS Watch/Warning Summary for 21 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 0 0 | 0 0 0 0 0 | 0 Svr Tstorm 46 2 | 0 1 1 0 0 | 3 Fl Flood 22 0 | 0 0 0 1 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 46 Verified: 25 [54.3 %] Reduction of Size Versus County Based [73.9 %] Average Perimeter Ratio [24.9 %] Percentage of Warned Area Verified (15km) [22.0 %] Average Storm Based Warning Size [1484 sq km] Probability of Detection(higher is better)[0.71] False Alarm Ratio (lower is better) [0.46] Critical Success Index (higher is better) [0.44] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Sat Jul 23 11:00:50 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Sat, 23 Jul 2011 11:00:50 -0500 Subject: IEM Daily Bulletin Message-ID: <201107231600.p6NG0o8L019366@despam-10.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 23 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-22 | Title : Iowa's deficits | Date : 22 Jul 05:55 AM | Votes : Good: 14 Bad: 12 +---------------------------------------------- With budget deficit talks in Washington dominating the news, some in Iowa are dealing with their own deficits in the form of lack of rainfall. The featured chart presents the four month departure of rainfall from average. The northeastern quarter has been the driest portion of the state. These totals do not include the heavy rainfall falling this Friday morning. This rainfall is coming just in time with corn at pollination stage. > NWS Watch/Warning Summary for 22 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 19 0 | 0 0 0 0 0 | 3 Svr Tstorm 181 13 | 0 5 9 2 1 | 3 Fl Flood 40 0 | 1 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 202 Verified: 119 [58.9 %] Reduction of Size Versus County Based [72.3 %] Average Perimeter Ratio [19.8 %] Percentage of Warned Area Verified (15km) [16.3 %] Average Storm Based Warning Size [2281 sq km] Probability of Detection(higher is better)[0.78] False Alarm Ratio (lower is better) [0.41] Critical Success Index (higher is better) [0.51] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Sun Jul 24 11:00:23 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Sun, 24 Jul 2011 11:00:23 -0500 Subject: IEM Daily Bulletin Message-ID: <201107241600.p6OG0Nwp008290@despam-10.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 24 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-23 | Title : Getting rain where we needed it | Date : 23 Jul 12:54 PM | Votes : Good: 8 Bad: 2 +---------------------------------------------- Friday's rainfall was a very welcome relief to some areas of the state that have been on the dry side this year. It also came at a perfect time for the pollinating corn crop in the state. The featured chart looks at how proportional the rainfall was over areas that needed it the most. Indeed, the heaviest amounts fell more proportionally over the areas with the deficits. The top chart shows the portion of the area with a deficit that got over an inch of rain. So over half of the area with a 3 inch deficit since March got over an inch of rain! The bottom chart is simply the average rain over the area with a given deficit. > NWS Watch/Warning Summary for 23 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 3 2 | 0 0 2 0 0 | 0 Svr Tstorm 145 4 | 4 1 4 2 0 | 5 Fl Flood 33 1 | 0 1 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 138 Verified: 72 [52.2 %] Reduction of Size Versus County Based [72.1 %] Average Perimeter Ratio [25.0 %] Percentage of Warned Area Verified (15km) [15.7 %] Average Storm Based Warning Size [1947 sq km] Probability of Detection(higher is better)[0.71] False Alarm Ratio (lower is better) [0.48] Critical Success Index (higher is better) [0.43] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Mon Jul 25 11:00:32 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Mon, 25 Jul 2011 11:00:32 -0500 Subject: IEM Daily Bulletin Message-ID: <201107251600.p6PG0Wqx023902@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 25 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-24 | Title : Chicago's Record Rainfall | Date : 24 Jul 07:39 PM | Votes : Good: 15 Bad: 6 +---------------------------------------------- Our atmosphere has been loaded with water recently. When storms form in this environment, they can become very efficient rain producers and dump extreme amounts of precipitation quickly. During just Saturday morning, the weather sensor at the Chicago O'Hare Airport recorded their largest daily rainfall total on record. The featured chart presents the one minute interval precipitation data from the weather sensor and shows computed rainfall rates measured over various intervals of time. The rates over 1 and 15 minute intervals are extrapolated out over the hour for comparison. The actual hourly rates are shown in red. For a minute by minute basis, rainfall rates once exceeded 8 inches per hour (0.14 inches reported in one minute)! > NWS Watch/Warning Summary for 24 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 3 0 | 0 0 0 0 0 | 0 Svr Tstorm 169 2 | 2 3 0 3 0 | 2 Fl Flood 36 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 171 Verified: 86 [50.3 %] Reduction of Size Versus County Based [76.6 %] Average Perimeter Ratio [25.7 %] Percentage of Warned Area Verified (15km) [23.2 %] Average Storm Based Warning Size [1353 sq km] Probability of Detection(higher is better)[0.70] False Alarm Ratio (lower is better) [0.50] Critical Success Index (higher is better) [0.41] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Tue Jul 26 11:00:36 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Tue, 26 Jul 2011 11:00:36 -0500 Subject: IEM Daily Bulletin Message-ID: <201107261600.p6QG0aa6004170@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 26 July 2011 > News No news is good news > Daily Feature No feature posted > NWS Watch/Warning Summary for 25 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 3 0 | 0 0 0 0 0 | 0 Svr Tstorm 140 0 | 0 0 0 0 13 | 3 Fl Flood 32 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 142 Verified: 80 [56.3 %] Reduction of Size Versus County Based [80.0 %] Average Perimeter Ratio [22.8 %] Percentage of Warned Area Verified (15km) [20.2 %] Average Storm Based Warning Size [1839 sq km] Probability of Detection(higher is better)[0.86] False Alarm Ratio (lower is better) [0.44] Critical Success Index (higher is better) [0.52] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Wed Jul 27 11:00:24 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Wed, 27 Jul 2011 11:00:24 -0500 Subject: IEM Daily Bulletin Message-ID: <201107271600.p6RG0Ocl010185@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 27 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-26 | Title : Warm July Nights | Date : 26 Jul 05:52 AM | Votes : Good: 56 Bad: 3 +---------------------------------------------- This July has been one of the warmest we have seen in a very long time. As measured by average daily low temperature, this year comes in second behind 1936 based on IEM statewide estimated data as shown by the featured chart. Years above average are shown in red and the 1930s really stand out. One reason why overnight lows have been so warm is the vast amount of moisture in the air this month (more on this tomorrow). The warm weather is expected to continue until the end of the month. > NWS Watch/Warning Summary for 26 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 9 0 | 0 0 0 0 1 | 2 Svr Tstorm 122 1 | 0 1 0 0 7 | 6 Fl Flood 21 0 | 0 0 0 0 1 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 132 Verified: 72 [54.5 %] Reduction of Size Versus County Based [77.4 %] Average Perimeter Ratio [19.0 %] Percentage of Warned Area Verified (15km) [19.2 %] Average Storm Based Warning Size [1850 sq km] Probability of Detection(higher is better)[0.84] False Alarm Ratio (lower is better) [0.45] Critical Success Index (higher is better) [0.50] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Thu Jul 28 11:00:12 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Thu, 28 Jul 2011 11:00:12 -0500 Subject: IEM Daily Bulletin Message-ID: <201107281600.p6SG0Cun022633@despam-12.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 28 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-27 | Title : More Humid than the rest | Date : 27 Jul 05:58 AM | Votes : Good: 39 Bad: 6 +---------------------------------------------- This month has seen a remarkable amount of humidity in the area as shown by the featured chart comparing average mixing ratio for July since 1951 at the Des Moines Airport. Last year had been the previously most humid for July, but this year has soundly beat it by a full gram! Of course, there is still a few days left in this July, but judging by the forecast, the sticky weather looks to stick around until the end of the month. > NWS Watch/Warning Summary for 27 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 5 0 | 0 4 0 0 0 | 1 Svr Tstorm 45 0 | 2 1 0 0 2 | 0 Fl Flood 22 0 | 2 3 0 0 3 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 49 Verified: 22 [44.9 %] Reduction of Size Versus County Based [66.2 %] Average Perimeter Ratio [23.4 %] Percentage of Warned Area Verified (15km) [13.4 %] Average Storm Based Warning Size [2435 sq km] Probability of Detection(higher is better)[0.76] False Alarm Ratio (lower is better) [0.55] Critical Success Index (higher is better) [0.39] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Fri Jul 29 11:00:18 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Fri, 29 Jul 2011 11:00:18 -0500 Subject: IEM Daily Bulletin Message-ID: <201107291600.p6TG0I2s001205@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 29 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-28 | Title : July percentiles | Date : 28 Jul 05:54 AM | Votes : Good: 43 Bad: 7 +---------------------------------------------- The warm and muggy July rolls on with low temperatures again in the mid to upper 70s this Thursday morning. The featured chart presents the daily high and low temperature percentiles so far this month. The low temperatures really stand out with most of the days this month shown well average and near the 100th percentile. The forecast for the rest of July continues this trend with only slightly cooler overnight temperatures expected until this weekend. > NWS Watch/Warning Summary for 28 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 0 0 | 0 0 0 0 0 | 0 Svr Tstorm 97 4 | 0 0 2 6 3 | 2 Fl Flood 23 2 | 3 2 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 88 Verified: 43 [48.9 %] Reduction of Size Versus County Based [78.6 %] Average Perimeter Ratio [23.8 %] Percentage of Warned Area Verified (15km) [15.8 %] Average Storm Based Warning Size [1523 sq km] Probability of Detection(higher is better)[0.85] False Alarm Ratio (lower is better) [0.51] Critical Success Index (higher is better) [0.45] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Sat Jul 30 11:00:35 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Sat, 30 Jul 2011 11:00:35 -0500 Subject: IEM Daily Bulletin Message-ID: <201107301600.p6UG0ZEQ007408@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 30 July 2011 > News No news is good news > Daily Feature +---------------------------------------------- http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2011-07-29 | Title : Dubuque's Record Rainfall | Date : 29 Jul 06:35 AM | Votes : Good: 29 Bad: 5 +---------------------------------------------- Just a few days ago, the Chicago O'Hare weather sensor set a local record for daily rainfall total. This time it is Dubuque's turn. The featured chart displays the one minute interval precipitation data from the Dubuque Airport weather sensor. The hourly rainfall rates are presented looking over various windows of time. On a minute by minute basis, the extrapolated hourly rates exceeded 10 inches per hour (0.19 inches in one minute)! Needless to say, this amount of intense rainfall caused a lot of problems in the area. Other (non-official) weather sensors in the area reported upwards of 14 inches of rain from this event! > NWS Watch/Warning Summary for 29 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 13 0 | 0 0 0 0 0 | 1 Svr Tstorm 124 0 | 0 1 0 0 0 | 5 Fl Flood 16 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report PHP Notice: Undefined index: warned in /mesonet/www/apps/iemwebsite/include/cow.php on line 464 PHP Notice: Undefined index: ts in /mesonet/www/apps/iemwebsite/include/cow.php on line 467 PHP Notice: Undefined index: buffered in /mesonet/www/apps/iemwebsite/include/cow.php on line 401 SVR+TOR Warnings Issued: 137 Verified: 53 [38.7 %] Reduction of Size Versus County Based [77.3 %] Average Perimeter Ratio [26.0 %] Percentage of Warned Area Verified (15km) [16.1 %] Average Storm Based Warning Size [1487 sq km] Probability of Detection(higher is better)[0.81] False Alarm Ratio (lower is better) [0.61] Critical Success Index (higher is better) [0.36] -------------- next part -------------- An HTML attachment was scrubbed... URL: From akrherz at iastate.edu Sun Jul 31 11:00:23 2011 From: akrherz at iastate.edu (daryl herzmann) Date: Sun, 31 Jul 2011 11:00:23 -0500 Subject: IEM Daily Bulletin Message-ID: <201107311600.p6VG0Nlj002225@despam-11.iastate.edu> Iowa Environmental Mesonet Daily Bulletin for 31 July 2011 > News No news is good news > Daily Feature No feature posted > NWS Watch/Warning Summary for 30 Jul 2011 Summary +_________ By WFO ____________+ Watches Type US IA | ARX DVN DMX OAX FSD | US Tornado 7 0 | 0 0 0 0 0 | 0 Svr Tstorm 113 0 | 3 0 0 0 0 | 3 Fl Flood 35 0 | 0 0 0 0 0 | N/A ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD > IEM Cow Report SVR+TOR Warnings Issued: 112 Verified: 53 [47.3 %] Reduction of Size Versus County Based [79.5 %] Average Perimeter Ratio [21.5 %] Percentage of Warned Area Verified (15km) [18.4 %] Average Storm Based Warning Size [1627 sq km] Probability of Detection(higher is better)[0.75] False Alarm Ratio (lower is better) [0.53] Critical Success Index (higher is better) [0.41] -------------- next part -------------- An HTML attachment was scrubbed... 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