IEM Daily Bulletin for Oct 25 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 25 October 2025

News

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Daily Feature

Des Moines vs Juneau
Date: 24 Oct 05:30 AM
Votes: Good: 10   Bad: 0 Abstain: 0

For the Des Moines airport, the coolest low temperature so far this fall season was observed Thursday morning at 34°F. Perhaps the taste of fall weather this week has some Iowans thinking about warmer weather places to go. So for today's featured chart, daily high and low temperatures are compared with Juneau, Alaska. The chart presents the daily difference in high and low temperature between the two sites with positive values (red bars) indicating Des Moines being warmer and negative values (blue bars) indicating Juneau being warmer. It is certainly interesting and perhaps not intuitive to see the Juneau being warmer days mostly confined to the winter season. Of course, the Juneau airport is near sea level elevation, surrounded by plenty of water and somewhat protected from cold continental air masses by nearby mountains, all of which help to moderate temperatures during the winter season. Des Moines has none of these things going for it and subject to the cold continental and arctic air masses that will soon be frequenting Iowa.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 24 Oct 2025 - 12 AM 25 Oct 2025 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	3	0	0	0	0	0	0	0
Svr Tstorm	71	0	0	0	0	0	0	3
Flash Flood	15	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:  72 Verified:   9 [12.5%]
Polygon Size Versus County Size            [17.7%]
Average Perimeter Ratio                    [34.1%]
Percentage of Warned Area Verified (15km)  [4.6%]
Average Storm Based Warning Size           [1974 sq km]
Probability of Detection(higher is better) [0.64]
False Alarm Ratio (lower is better)        [0.88]
Critical Success Index (higher is better)  [0.12]