IEM Daily Bulletin for Apr 5 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 05 April 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
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Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 4 Apr 2026 - 12 AM 5 Apr 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	18	0	0	0	0	0	0	0
Svr Tstorm	29	0	0	0	0	0	0	2
Flash Flood	5	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:  47 Verified:  10 [21.3%]
Polygon Size Versus County Size            [26.5%]
Average Perimeter Ratio                    [26.9%]
Percentage of Warned Area Verified (15km)  [13.4%]
Average Storm Based Warning Size           [1047 sq km]
Probability of Detection(higher is better) [0.50]
False Alarm Ratio (lower is better)        [0.79]
Critical Success Index (higher is better)  [0.18]

IEMBot Social Media Posts

IEMBot can be configured to post messages to a number of social media services. More details: IEMBot Homepage.

Posts yesterday per supported service:

• ATMosphere (bluesky only attm): 1,680
• Mastodon / Fediverse: 33
• Slack: 73
• Twitter/X: 13,563
• HTTP Webhooks: 81
• Weather.IM Jabber Chatrooms: 12,732