Iowa Environmental Mesonet Daily Bulletin for 13 April 2026

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NWS Watch/Warning Summary for 12 AM 12 Apr 2026 - 12 AM 13 Apr 2026 CDT

Summary By WFO Watches
Type USIA ARXDVNDMXOAXFSD US
Tornado 4 0 0 0 0 0 0 0
Svr Tstorm 24 1 0 0 1 0 0 1
Flash Flood 10 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:  28 Verified:   9 [32.1%]
Polygon Size Versus County Size            [14.8%]
Average Perimeter Ratio                    [15.0%]
Percentage of Warned Area Verified (15km)  [20.4%]
Average Storm Based Warning Size           [1262 sq km]
Probability of Detection(higher is better) [0.43]
False Alarm Ratio (lower is better)        [0.68]
Critical Success Index (higher is better)  [0.22]

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