IEM Daily Bulletin for Dec 8 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 08 December 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
No code commits found in previous 24 Hours

Daily Feature

'25-'26 Winter Storm #4
Date: 07 Dec 08:10 AM
Votes: Good: 12   Bad: 1 Abstain: 1

Our bout of early winter season snowfall storms continued on Saturday with a stripe of snowfall painted from northwestern to east-central Iowa. The largest reports received so far approached ten inches over far northwestern Iowa. The first few storms presented snowfall measurement challenges, but this one fell quickly and didn't blow around too much. More chances of snowfall are in the forecast, but also a period of above freezing temperatures this week.

NWS Watch/Warning Summary for 12 AM 7 Dec 2025 - 12 AM 8 Dec 2025 CST

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	0	0	0	0	0	0	0	0
Svr Tstorm	1	0	0	0	0	0	0	0
Flash Flood	1	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:   1 Verified:   0 [0.0%]
Polygon Size Versus County Size            [13.0%]
Average Perimeter Ratio                    [17.7%]
Percentage of Warned Area Verified (15km)  [0.0%]
Average Storm Based Warning Size           [866 sq km]
Probability of Detection(higher is better) [0.00]
False Alarm Ratio (lower is better)        [1.00]
Critical Success Index (higher is better)  [0.00]