Iowa Environmental Mesonet Daily Bulletin for 31 August 2026

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NWS Watch/Warning Summary for 12 AM 30 Aug 2026 - 12 AM 31 Aug 2026 CDT

Summary By WFO Watches
Type USIA ARXDVNDMXOAXFSD US
Tornado 0 0 0 0 0 0 0 0
Svr Tstorm 91 0 0 0 0 3 0 2
Flash Flood 30 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:  86 Verified:  22 [25.6%]
Polygon Size Versus County Size            [15.5%]
Average Perimeter Ratio                    [26.0%]
Percentage of Warned Area Verified (15km)  [12.0%]
Average Storm Based Warning Size           [2166 sq km]
Probability of Detection(higher is better) [0.56]
False Alarm Ratio (lower is better)        [0.74]
Critical Success Index (higher is better)  [0.21]

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