IEM Daily Bulletin for Oct 21 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 21 October 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Oct 20 10:09 PM	iem,main	📝 Sundry updates per log review	Link

Daily Feature

First Sub 43°F Low
Date: 20 Oct 05:30 AM
Votes: Good: 11   Bad: 0 Abstain: 0

Sunday started off chilly with Des Moines setting a new fall minimum low temperature of the season at 42°F. It has been a rather mild fall season so far with not much in the way of chilly weather and very little limited coverage of sub-freezing temperatures across Iowa. The featured chart looks into the first fall season date with a low temperature below 43°F for Des Moines. This year's value is third latest on record, behind 1914 and 1963. Cooler temperatures are expected this week with lows down into the 30s for much of the state and even the first wide spread freeze mid week.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 20 Oct 2025 - 12 AM 21 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	0	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

No SVR+TOR Warnings Issued.