IEM Daily Bulletin for Aug 31 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 31 August 2025

News

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IEM Code Pushes <repo,branch> on Github

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Daily Feature

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NWS Watch/Warning Summary for 12 AM 30 Aug 2025 - 12 AM 31 Aug 2025 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	0	0	0	0	0	0	0	0
Svr Tstorm	6	0	0	0	0	0	0	0
Flash Flood	12	1	0	0	0	0	1	---

ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD

IEM Cow Report

SVR+TOR Warnings Issued:   4 Verified:   1 [25.0%]
Polygon Size Versus County Size            [27.9%]
Average Perimeter Ratio                    [24.7%]
Percentage of Warned Area Verified (15km)  [22.5%]
Average Storm Based Warning Size           [1359 sq km]
Probability of Detection(higher is better) [0.62]
False Alarm Ratio (lower is better)        [0.75]
Critical Success Index (higher is better)  [0.22]