IEM Daily Bulletin for Feb 4 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 04 February 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Feb 3 10:25 PM	iem,main	🔨 Schema updates per akrherz/iembot#132	Link
Feb 3 10:04 AM	iem-database,main	✨ Introduce iembot database for #132	Link
Feb 3 10:12 PM	iem-database,main	📝 Unversioned add of get_or_create_iembot_channel_id	Link

Daily Feature

'25-'26 Winter Storm #15
Date: 03 Feb 08:13 AM
Votes: Good: 12   Bad: 1 Abstain: 0

A compact system dumped a quick inch or two of snowfall over eastern Iowa on Monday evening and into early Tuesday morning. The featured map analysis of available NWS and CoCoRaHS reports shows the largest snowfall totals around two inches found from Cedar Rapids to Davenport. These maps attempt to only show areas that received measurable snowfall, so trace amounts of snowfall are not included. Temperatures are still forecast to nicely warm later this week and any of the meager recently accumulated snowfall over the state will soon be gone.

NWS Watch/Warning Summary for 12 AM 3 Feb 2026 - 12 AM 4 Feb 2026 CST

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	4	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:   5 Verified:   0 [0.0%]
Polygon Size Versus County Size            [7.9%]
Average Perimeter Ratio                    [12.0%]
Percentage of Warned Area Verified (15km)  [0.0%]
Average Storm Based Warning Size           [242 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]