IEM Daily Bulletin for Oct 7 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 07 October 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Oct 6 1:42 PM	iem,main	[pre-commit.ci] pre-commit autoupdate updates: - [github.com/pre-commit/mirrors-eslint: v9.36.0 → v9.37.0](https://github.com/pre-commit/mirrors-eslint/compare/v9.36.0...v9.37.0) - [github.com/astral-sh/ruff-pre-commit: v0.13.2 → v0.13.3](https://github.com/astral-sh/ruff-pre-commit/compare/v0.13.2...v0.13.3)	Link
Oct 6 1:43 PM	pyiem,main	[pre-commit.ci] pre-commit autoupdate updates: - [github.com/astral-sh/ruff-pre-commit: v0.13.2 → v0.13.3](https://github.com/astral-sh/ruff-pre-commit/compare/v0.13.2...v0.13.3)	Link
Oct 6 1:42 PM	iemone,main	[pre-commit.ci] pre-commit autoupdate updates: - [github.com/pre-commit/mirrors-eslint: v9.30.1 → v9.37.0](https://github.com/pre-commit/mirrors-eslint/compare/v9.30.1...v9.37.0)	Link
Oct 6 1:42 PM	iemlsr,main	[pre-commit.ci] pre-commit autoupdate updates: - [github.com/pre-commit/mirrors-eslint: v9.30.1 → v9.37.0](https://github.com/pre-commit/mirrors-eslint/compare/v9.30.1...v9.37.0)	Link
Oct 6 1:42 PM	pywwa,main	[pre-commit.ci] pre-commit autoupdate updates: - [github.com/astral-sh/ruff-pre-commit: v0.13.2 → v0.13.3](https://github.com/astral-sh/ruff-pre-commit/compare/v0.13.2...v0.13.3) - [github.com/tox-dev/pyproject-fmt: v2.6.0 → v2.7.0](https://github.com/tox-dev/pyproject-fmt/compare/v2.6.0...v2.7.0)	Link
Oct 6 1:42 PM	iem-database,main	[pre-commit.ci] pre-commit autoupdate updates: - [github.com/astral-sh/ruff-pre-commit: v0.13.2 → v0.13.3](https://github.com/astral-sh/ruff-pre-commit/compare/v0.13.2...v0.13.3)	Link
Oct 6 9:24 PM	iem-database,main	💚 Add realpath idep test file	Link
Oct 6 1:42 PM	iem-web-services,main	[pre-commit.ci] pre-commit autoupdate updates: - [github.com/astral-sh/ruff-pre-commit: v0.13.2 → v0.13.3](https://github.com/astral-sh/ruff-pre-commit/compare/v0.13.2...v0.13.3)	Link

Daily Feature

Warmest Start to October
Date: 06 Oct 05:30 AM
Votes: Good: 15   Bad: 0 Abstain: 0

The first five days of October were exceptionally warm with highs mostly in the 80s and lows in the 60s for Iowa. The featured chart presents the average temperature for the first five days of October for each year on record for Des Moines. The 2025 average near 75°F is almost 2 degrees warmer than the previous warmest value way back during 1900! A bit of fall reality has settled over Iowa for Monday, but far southeastern Iowa will have another day of very warm October temperatures. Even after this early week drop in temperatures, moderation will happen for the remainder of the weekend with forecast highs expected again to be near 80°F next weekend!

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 6 Oct 2025 - 12 AM 7 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	8	0	0	0	0	0	0	0
Flash Flood	4	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:   1 [9.1%]
Polygon Size Versus County Size            [19.0%]
Average Perimeter Ratio                    [20.9%]
Percentage of Warned Area Verified (15km)  [4.7%]
Average Storm Based Warning Size           [1363 sq km]
Probability of Detection(higher is better) [0.33]
False Alarm Ratio (lower is better)        [0.91]
Critical Success Index (higher is better)  [0.08]