IEM Daily Bulletin for Oct 20 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 20 October 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Oct 19 6:51 PM	iem,main	📝 Sundry rollups	Link
Oct 19 9:10 PM	iem,main	🎨 Address some deprecations	Link
Oct 19 10:01 PM	iem,main	📝 Sundry updates	Link
Oct 19 9:50 PM	iem-database,main	✅ Add IA2203 alldata	Link

Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 19 Oct 2025 - 12 AM 20 Oct 2025 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	2	0	0	0	0	0	0	0
Svr Tstorm	15	0	0	0	0	0	0	0
Flash Flood	0	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:  17 Verified:  11 [64.7%]
Polygon Size Versus County Size            [44.1%]
Average Perimeter Ratio                    [29.6%]
Percentage of Warned Area Verified (15km)  [22.7%]
Average Storm Based Warning Size           [2312 sq km]
Probability of Detection(higher is better) [0.53]
False Alarm Ratio (lower is better)        [0.35]
Critical Success Index (higher is better)  [0.41]