IEM Daily Bulletin for Oct 22 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 22 October 2025

News

No news is good news

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Daily Feature

Six — Seven
Date: 21 Oct 05:30 AM
Votes: Good: 20   Bad: 8 Abstain: 2

From the "Life mimics Art" department, the high temperature on Monday was 67°F for both the Ames and Des Moines airports. This was much to the delight of many school-aged weather / meme enthusiasts, including those within the IEM's developer's household. So today's featured map takes a look at the observed frequency of this high temperature value over the contiguous US using long term climate sites with at least 50 years of data. The highest frequencies are found over California and the lowest over the southern tip of Texas and the Florida Peninsula. Iowa is situated within the large continental frequency blob in the four to five day range. Within the IEM database, the highest frequency was found for the Hawaii National Park (25.0 days per year), which is an elevation of about 4,000 ft. If you are still reading this and wondering when this last happened for Ames + Des Moines, it was only last year on 24 April 2024!

NWS Watch/Warning Summary for 12 AM 21 Oct 2025 - 12 AM 22 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	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:  10 Verified:   5 [50.0%]
Polygon Size Versus County Size            [28.2%]
Average Perimeter Ratio                    [25.3%]
Percentage of Warned Area Verified (15km)  [33.2%]
Average Storm Based Warning Size           [990 sq km]
Probability of Detection(higher is better) [0.80]
False Alarm Ratio (lower is better)        [0.50]
Critical Success Index (higher is better)  [0.44]