IEM Daily Bulletin

[Iowa Mesonet]

Iowa Environmental Mesonet Daily Bulletin
Data valid for 11 July 2007

> News
    No news is good news

> Yesterday's Daily Feature

 +----------------------------------------------
http://mesonet.agron.iastate.edu/onsite/features/cat.php?day=2007-07-11
 | Title : Lowered the floor
 | Date  : 11 Jul 07:06 AM
 | Votes : Good: 16   Bad: 3
 +----------------------------------------------

The featured graph is a time series of recent temperature and dew point observations from the Des Moines airport.  This plot clearly illustrates the importance of the dew point temperature as a floor to overnight low temperatures.  Keep in mind that the dew point is <b>not</b> a function of dry air temperature.  The upward pointing arrow shows how on Monday morning, the air temperature only was able to cool to a few degrees above the dew point near 70.  Since then, a front passed with much drier air (dew points dropped ~15 degrees) and you can see what temperatures have done since yesterday evening.  The floor has been lowered and with clear skies, air temperatures fell like a rock into the 50s.

> NWS Watch/Warning Summary
*** Products issued on 11 Jul 2007

             Summary +_________ By WFO ____________+  Watches 
Type         US   IA | ARX   DVN   DMX   OAX   FSD |  US 
Tornado       4    0 |   0     0     0     0     0 |   1
Svr Tstorm  117    0 |   0     0     0     0     0 |   2
Fl Flood      0    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


> Network Metrics

-----------------------------------------------------------------
 Iowa ASOS            Reporting Stations: 14  Obs Received: 331
-----------------------------------------------------------------
 Low Air Temp[F]     :  50.00 [05:52 AM] SUX   SIOUX CITY
 High Dew Point[F]   :  59.00 [08:52 PM] DVN   QUAD CITIES
 Low Dew Point[F]    :  44.96 [02:52 PM] EST   ESTHERVILLE
 Peak Gust[knots]    :  23.00 [02:53 PM] MCW   MASON CITY
                     :  23.00 [03:53 PM] SPW   SPENCER
-----------------------------------------------------------------
 Iowa AWOS            Reporting Stations: 42  Obs Received: 8577
-----------------------------------------------------------------
 High Air Temp[F]    :  84.20 [04:35 PM] RDK   RED OAK
 Low Air Temp[F]     :  50.00 [05:55 AM] IIB   None
                     :  50.00 [05:15 AM] LRJ   LE MARS
                     :  50.00 [04:35 AM] SHL   SHELDON
 High Dew Point[F]   :  64.40 [08:15 PM] SDA   None
 Low Dew Point[F]    :  41.00 [05:35 PM] CKP   Cherokee
 Peak Gust[knots]    :  26.00 [01:18 PM] IIB   INDEPENDENCE
-----------------------------------------------------------------
 Iowa RWIS            Reporting Stations: 57  Obs Received: 7596
-----------------------------------------------------------------
 High Air Temp[F]    : 102.80 [07:15 PM] RCBI4 Council Bluffs (I-80)
 Low Air Temp[F]     :  48.20 [05:26 AM] RSYI4 Sibley
 High Dew Point[F]   :  71.00 [07:15 PM] RCBI4 Council Bluffs (I-80)
 Low Dew Point[F]    :  35.20 [07:19 PM] RMCI4 Mason City (I-35)
 Peak Gust[knots]    :  25.00 [06:21 PM] RWII4 Williams (I-35)
                     :  25.00 [02:43 PM] RSBI4 Steamboat Rock (US20)
                     :  25.00 [02:29 PM] RMCI4 Mason City (I-35)
-----------------------------------------------------------------
 KCCI SchoolNet       Reporting Stations: 63  Obs Received: 87739
-----------------------------------------------------------------
 High Air Temp[F]    :  83.00 [04:18 PM] SMNI4 Montezuma
 Low Air Temp[F]     :   7.00 [12:17 PM] SIFI4 Iowa Falls
 High Dew Point[F]   :  75.00 [03:55 PM] SLMI4 Latimer
 Low Dew Point[F]    : -33.00 [04:57 PM] SLMI4 Latimer
 Peak Gust[knots]    :  33.02 [01:45 PM] SFOI4 Fontanelle
-----------------------------------------------------------------
 KIMT SchoolNet       Reporting Stations: 25  Obs Received: 32189
-----------------------------------------------------------------
 High Air Temp[F]    :  78.00 [04:44 PM] SRRI4 Rockford
 Low Air Temp[F]     :  50.00 [05:36 AM] SLEM5 LeRoy
                     :  50.00 [04:48 AM] STMM5 West Concord
                     :  50.00 [04:17 AM] SFCM5 Preston
 High Dew Point[F]   :  60.00 [07:42 AM] SNKI4 Northwood
 Low Dew Point[F]    :  41.00 [05:28 PM] SCCI4 Charles City
 Peak Gust[knots]    :  28.00 [03:43 PM] SGMM5 Grand Meadow
-----------------------------------------------------------------
 KELO WeatherNet      Reporting Stations: 34  Obs Received: 14689
-----------------------------------------------------------------
 High Air Temp[F]    :  85.00 [03:25 PM] WHSS2 Winner
 Low Air Temp[F]     :   0.00 [12:31 PM] SALS2 Alcester
 High Dew Point[F]   :  73.00 [04:17 PM] SYAS2 Yankton
 Low Dew Point[F]    : -36.00 [09:30 PM] SYAS2 Yankton
 Peak Gust[knots]    :  33.02 [12:06 AM] SABS2 Aberdeen
-----------------------------------------------------------------
 Iowa NWS COOP        Reporting Stations: 101  Obs Received: 531
-----------------------------------------------------------------
 High Air Temp[F]    :  83.00 [        ] ROKI4 RED OAK
                     :  83.00 [        ] ONAI4 ONAWA 3 NW
                     :  83.00 [        ] LOGI4 LOGAN
                     : 2 Other Duplicates Skipped
 Low Air Temp[F]     :  49.00 [        ] SNBI4 SANBORN
 Max Rainfall [inch] :   0.02 [        ] ROKI4 RED OAK
-----------------------------------------------------------------
 Misc Stations        Reporting Stations: 5  Obs Received: 1952
-----------------------------------------------------------------
 High Air Temp[F]    :  77.00 [11:00 AM] OT0002 ISU | AGRONOMY HALL
 Low Air Temp[F]     :  55.90 [05:45 AM] OT0006 NE Ames
 High Dew Point[F]   :  61.00 [10:47 AM] OT0007 ISU Agronomy II
 Low Dew Point[F]    :  40.00 [12:48 PM] RAWDES Desoto

>  All data subject to revision and is intended for
>  educational use only.