IEM Daily Bulletin for Sep 29 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 29 September 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Sep 28 4:20 PM	iem,main	🐛 Fix issues found per log review	Link
Sep 28 6:53 PM	iem,main	🐛 Correct content_type for caching	Link
Sep 28 6:45 PM	pywwa,main	✏️ Fix typo	Link

Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 28 Sep 2025 - 12 AM 29 Sep 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	24	0	0	0	0	0	0	0
Flash Flood	22	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:  24 Verified:   5 [20.8%]
Polygon Size Versus County Size            [3.8%]
Average Perimeter Ratio                    [9.1%]
Percentage of Warned Area Verified (15km)  [9.3%]
Average Storm Based Warning Size           [849 sq km]
Probability of Detection(higher is better) [0.86]
False Alarm Ratio (lower is better)        [0.79]
Critical Success Index (higher is better)  [0.20]