IEM Daily Bulletin for Oct 8 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 08 October 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Oct 7 8:03 AM	iem,main	🐛 Fix js scope issue with autoplot frontend	Link
Oct 7 3:22 PM	iem-web-services,main	🎨 Address pyiem deprecation	Link

Daily Feature

Needed October Rainfall
Date: 07 Oct 05:29 AM
Votes: Good: 9   Bad: 12 Abstain: 0

The featured map presents the combination of NOAA MRMS precipitation estimates from Sunday through early Tuesday morning and the current US Drought Monitor analysis. This needed precipitation event was thanks to a slow moving front that has swept the state clean of the very warm air that started off October. The map shows that much of the heaviest totals missed the parts of the state presently within a "D0" drought analysis, but the entire state needed rain. Once the showers clear southeastern Iowa later this morning, there are a few chances of light rainfall over the coming days along with warming temperatures.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 7 Oct 2025 - 12 AM 8 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	6	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:   4 [40.0%]
Polygon Size Versus County Size            [4.4%]
Average Perimeter Ratio                    [14.1%]
Percentage of Warned Area Verified (15km)  [21.3%]
Average Storm Based Warning Size           [829 sq km]
Probability of Detection(higher is better) [0.83]
False Alarm Ratio (lower is better)        [0.60]
Critical Success Index (higher is better)  [0.37]