Iowa Environmental Mesonet Daily Bulletin for 18 September 2018

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Daily Feature

September Flight Rules
Date: 17 Sep 05:34 AM
Votes: Good: 7   Bad: 0 Abstain: 0

This September has been seen two distinct periods of weather so far. The first week or so was extremely wet and now the last week or so has been bone dry and warm. The featured chart looks at the hourly flight rule status for the Des Moines airport so far this month. The two periods can be discerned with plenty of flight issues found over the first seven days and no issues since. Monday is expected to be hot and mostly dry for much of Iowa while better rain chances arriving on Tuesday and a turn to cooler conditions.

NWS Watch/Warning Summary for 12 AM 17 Sep 2018 - 12 AM 18 Sep 2018 CDT

Summary By WFO Watches
Type USIA ARXDVNDMXOAXFSD US
Tornado 32 0 0 0 0 0 0 1
Svr Tstorm 28 1 3 0 1 0 0 0
Flash Flood 16 0 0 0 0 0 0---

ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD

IEM Cow Report

SVR+TOR Warnings Issued: 59 Verified: 24  [40.7 %]
Reduction of Size Versus County Based     [72.6 %]
Average Perimeter Ratio                   [30.7 %]
Percentage of Warned Area Verified (15km) [19.8 %]
Average Storm Based Warning Size          [1000 sq km]
Probability of Detection(higher is better)[0.65]
False Alarm Ratio (lower is better)       [0.59]
Critical Success Index (higher is better) [0.33]