IEM Daily Bulletin for Oct 27 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 27 October 2025

News

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NWS Watch/Warning Summary for 12 AM 26 Oct 2025 - 12 AM 27 Oct 2025 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	16	0	0	0	0	0	0	1
Svr Tstorm	15	0	0	0	0	0	0	0
Flash Flood	26	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:  30 Verified:   4 [13.3%]
Polygon Size Versus County Size            [17.0%]
Average Perimeter Ratio                    [7.8%]
Percentage of Warned Area Verified (15km)  [6.4%]
Average Storm Based Warning Size           [770 sq km]
Probability of Detection(higher is better) [0.67]
False Alarm Ratio (lower is better)        [0.87]
Critical Success Index (higher is better)  [0.12]