IEM Daily Bulletin for Nov 6 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 06 November 2025

News

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Daily Feature

Cold Weekend Upcoming
Date: 05 Nov 05:30 AM
Votes: Good: 16   Bad: 0 Abstain: 0

For early November, the weather on Monday and especially Tuesday was quite pleasant with highs in the 60s and even a few 70s yesterday. We will have a couple more pleasant days this week before a rude reminder of the upcoming winter season arrives for the weekend. The featured chart is courtesy of the venerable Bufkit Warehouse and shows a time-series of forecast temperatures from various model sources for Des Moines. The times on the x-axis use the meteorological standard of UTC, which is currently six hours ahead of our local central standard time. The slide down in temperatures on Saturday is rather pronounced with forecast highs, at least from the GFS model, on Sunday only in the 30s! There are also chances of snow and the Weather Prediction Center has very small probabilities of four plus inches of snow clipping far northern Iowa on Sunday!

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 5 Nov 2025 - 12 AM 6 Nov 2025 CST

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	1	0	0	0	0	0	0	0
Svr Tstorm	10	0	0	0	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:  11 Verified:   7 [63.6%]
Polygon Size Versus County Size            [51.5%]
Average Perimeter Ratio                    [23.1%]
Percentage of Warned Area Verified (15km)  [28.4%]
Average Storm Based Warning Size           [3075 sq km]
Probability of Detection(higher is better) [0.69]
False Alarm Ratio (lower is better)        [0.36]
Critical Success Index (higher is better)  [0.49]