IEM Daily Bulletin for Sep 22 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 22 September 2025

News

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Daily Feature

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NWS Watch/Warning Summary for 12 AM 21 Sep 2025 - 12 AM 22 Sep 2025 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	76	4	1	0	0	0	12	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:  77 Verified:  34 [44.2%]
Polygon Size Versus County Size            [11.6%]
Average Perimeter Ratio                    [20.4%]
Percentage of Warned Area Verified (15km)  [29.6%]
Average Storm Based Warning Size           [753 sq km]
Probability of Detection(higher is better) [0.82]
False Alarm Ratio (lower is better)        [0.56]
Critical Success Index (higher is better)  [0.40]