IEM Daily Bulletin for Oct 19 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 19 October 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Oct 18 5:48 PM	iem-database,main	⬆️ Update ruff	Link
Oct 18 5:50 PM	iem-database,main	✨ Store more variables for dyntill refs dailyerosion/dep#365	Link

Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 18 Oct 2025 - 12 AM 19 Oct 2025 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	4	0	0	0	0	0	0	3
Svr Tstorm	77	0	0	0	0	0	0	2
Flash Flood	2	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:  80 Verified:  23 [28.7%]
Polygon Size Versus County Size            [30.0%]
Average Perimeter Ratio                    [20.5%]
Percentage of Warned Area Verified (15km)  [9.3%]
Average Storm Based Warning Size           [1933 sq km]
Probability of Detection(higher is better) [0.82]
False Alarm Ratio (lower is better)        [0.71]
Critical Success Index (higher is better)  [0.27]