IEM Daily Bulletin for Nov 25 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 25 November 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Nov 24 2:15 PM	iem,main	📝 Sundry updates per log review	Link
Nov 24 2:24 PM	iem,main	💚 Correct and improve PHP smoke test	Link
Nov 24 9:31 PM	iem,main	🐛 Address legend not appearing	Link
Nov 24 3:22 PM	iemlsr,main	⬆️ Update npm deps	Link
Nov 24 3:29 PM	iemlsr,main	📝 Sundry review and coverage improvements	Link
Nov 24 3:34 PM	iemlsr,main	💚 Address deepsource concern	Link
Nov 24 3:37 PM	iemlsr,main	💚 Address codecov config	Link

Daily Feature

Quiet November So Far
Date: 24 Nov 05:30 AM
Votes: Good: 12   Bad: 0 Abstain: 0

The featured chart displays the temporal duration of headlines issued by NWS Des Moines for this November. It has been rather quiet, so far, with only three Dense Fog Advisories and a Winter Weather Advisory shown on the chart. This week does look a bit more active with a number of passing storm systems bringing chances of precipitation. Temperatures will turn much colder as well. At this point, the most significant storm to impact holiday travel looks to arrive for the upcoming weekend.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 24 Nov 2025 - 12 AM 25 Nov 2025 CST

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	5	0	0	0	0	0	0	3
Svr Tstorm	18	0	0	0	0	0	0	0
Flash Flood	12	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:  23 Verified:   5 [21.7%]
Polygon Size Versus County Size            [22.1%]
Average Perimeter Ratio                    [11.7%]
Percentage of Warned Area Verified (15km)  [8.1%]
Average Storm Based Warning Size           [1834 sq km]
Probability of Detection(higher is better) [0.81]
False Alarm Ratio (lower is better)        [0.78]
Critical Success Index (higher is better)  [0.21]