Iowa Environmental Mesonet Daily Bulletin for 13 September 2026

> News

    No news is good news

> IEM Code Pushes <repo,branch> on Github
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> Daily Feature

    No feature posted

> NWS Watch/Warning Summary for 12 AM 12 Sep 2026 - 12 AM 13 Sep 2026 CDT
             Summary +_________ By WFO ____________+  Watches
Type         US   IA | ARX   DVN   DMX   OAX   FSD |  US
Tornado       1    0 |   0     0     0     0     0 |   0
Svr Tstorm  102    0 |   0     0     0     4     0 |   1
Flash Flood  44    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: 101 Verified:  31 [30.7%]
Polygon Size Versus County Size            [13.9%]
Average Perimeter Ratio                    [25.6%]
Percentage of Warned Area Verified (15km)  [17.5%]
Average Storm Based Warning Size           [968 sq km]
Probability of Detection(higher is better) [0.75]
False Alarm Ratio (lower is better)        [0.69]
Critical Success Index (higher is better)  [0.28]


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