IEM Daily Bulletin for Oct 3 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 03 October 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Oct 2 11:02 AM	iem,main	🐛 Restore missing import	Link

Daily Feature

October 80+°F
Date: 02 Oct 05:30 AM
Votes: Good: 10   Bad: 0 Abstain: 0

The very warm early fall season weather continued on the first day of October with highs reaching 80°F degrees for much of the state. The featured chart presents the daily frequency of such a warm high temperature by day of October for Ames. It is quite interesting to see the increased frequencies during the first few days and then the rapid drop off with a settling around 15% on October 5th. A climate explanation for this is not apparent! Of course, the overall trend is downward for the month with such days becoming more fleeting as we progress. Interestingly and coincidentally, the present forecast has temperatures dropping back near 70°F for highs on the 6th!

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 2 Oct 2025 - 12 AM 3 Oct 2025 CDT

	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	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:   1 Verified:   1 [100.0%]
Polygon Size Versus County Size            [6.2%]
Average Perimeter Ratio                    [0.0%]
Percentage of Warned Area Verified (15km)  [83.0%]
Average Storm Based Warning Size           [748 sq km]
Probability of Detection(higher is better) [0.50]
False Alarm Ratio (lower is better)        [0.00]
Critical Success Index (higher is better)  [0.50]