IEM Daily Bulletin for Dec 29 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 29 December 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Dec 28 6:42 AM	iem,main	🐛 Allow float threshold values	Link

Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 28 Dec 2025 - 12 AM 29 Dec 2025 CST

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	24	0	0	0	0	0	0	1
Svr Tstorm	81	0	0	1	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: 105 Verified:  21 [20.0%]
Polygon Size Versus County Size            [37.1%]
Average Perimeter Ratio                    [34.3%]
Percentage of Warned Area Verified (15km)  [7.5%]
Average Storm Based Warning Size           [1662 sq km]
Probability of Detection(higher is better) [0.66]
False Alarm Ratio (lower is better)        [0.80]
Critical Success Index (higher is better)  [0.18]