IEM Daily Bulletin for Apr 10 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 10 April 2026

News

No news is good news

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Timestamp	Repository	Message	Link
Apr 9 1:08 PM	iem,main	📝 Sundry updates per review	Link
Apr 9 9:06 AM	pyiem,main	🎨 Prevent larger than 10MB memcache write	Link
Apr 9 9:18 AM	pyiem,main	💚 Use Callable ABC type for annotation	Link

Daily Feature

D1+ since Jan 2025
Date: 09 Apr 05:30 AM
Votes: Good: 15   Bad: 1 Abstain: 1

The weekly US Drought Monitor will be released later this morning and likely show some improvements thanks to the heavy rains over the past week, but Iowa is still has a ways to go before being drought free. The driest areas of the state continue to be mostly confined to the SE, SW, and NW corners of Iowa. The featured map presents an IEM computation of the percentage of weeks since the start of 2025 that analyzed drought of at least "D1: Moderate Drought" was present. There's an interesting sliver of area from Creston to south of Des Moines that has avoided D1+ over this period! The near term forecast has plenty of significant rainfall chances, so hopefully continued drought busting can occur before the start of the 2026 growing season!

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 9 Apr 2026 - 12 AM 10 Apr 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	1	0	0	0	0	0	0	0
Svr Tstorm	60	0	0	0	0	1	0	1
Flash Flood	2	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:  61 Verified:  19 [31.1%]
Polygon Size Versus County Size            [10.5%]
Average Perimeter Ratio                    [25.7%]
Percentage of Warned Area Verified (15km)  [22.0%]
Average Storm Based Warning Size           [725 sq km]
Probability of Detection(higher is better) [0.82]
False Alarm Ratio (lower is better)        [0.69]
Critical Success Index (higher is better)  [0.29]

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