IEM Daily Bulletin for Aug 11 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 11 August 2025

News

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Daily Feature

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NWS Watch/Warning Summary for 12 AM 10 Aug 2025 - 12 AM 11 Aug 2025 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	3	2	0	2	0	1	0	0
Svr Tstorm	153	7	0	1	3	6	0	4
Flash Flood	23	8	3	4	0	2	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: 150 Verified:  43 [28.7%]
Polygon Size Versus County Size            [18.8%]
Average Perimeter Ratio                    [32.0%]
Percentage of Warned Area Verified (15km)  [16.9%]
Average Storm Based Warning Size           [1366 sq km]
Probability of Detection(higher is better) [0.79]
False Alarm Ratio (lower is better)        [0.71]
Critical Success Index (higher is better)  [0.27]