IEM Daily Bulletin for Dec 26 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 26 December 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Dec 25 9:05 PM	iem,main	🐛 Prevent out of bounds	Link
Dec 25 9:05 PM	iem,main	✨ Add Dense Fog Advisory option https://mesonet.agron.iastate.edu/plotting/auto/?q=232	Link

Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 25 Dec 2025 - 12 AM 26 Dec 2025 CST

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	2	0	0	0	0	0	0	0
Svr Tstorm	13	0	0	0	0	0	0	0
Flash Flood	14	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:  15 Verified:   3 [20.0%]
Polygon Size Versus County Size            [11.1%]
Average Perimeter Ratio                    [21.3%]
Percentage of Warned Area Verified (15km)  [15.7%]
Average Storm Based Warning Size           [766 sq km]
Probability of Detection(higher is better) [0.21]
False Alarm Ratio (lower is better)        [0.80]
Critical Success Index (higher is better)  [0.11]