IEM Daily Bulletin for May 11 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 11 May 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

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Daily Feature

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NWS Watch/Warning Summary for 12 AM 10 May 2026 - 12 AM 11 May 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	2	0	0	0	0	0	0	0
Svr Tstorm	125	0	0	0	0	0	0	3
Flash Flood	13	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: 123 Verified:  43 [35.0%]
Polygon Size Versus County Size            [28.4%]
Average Perimeter Ratio                    [32.8%]
Percentage of Warned Area Verified (15km)  [17.6%]
Average Storm Based Warning Size           [1611 sq km]
Probability of Detection(higher is better) [0.88]
False Alarm Ratio (lower is better)        [0.65]
Critical Success Index (higher is better)  [0.33]

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): 1,661
• Mastodon / Fediverse: 10
• Slack: 68
• Twitter/X: 11,624
• HTTP Webhooks: 118
• Weather.IM Jabber Chatrooms: 10,885