IEM Daily Bulletin for Apr 13 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 13 April 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

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Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 12 Apr 2026 - 12 AM 13 Apr 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	4	0	0	0	0	0	0	0
Svr Tstorm	24	1	0	0	1	0	0	1
Flash Flood	10	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:  28 Verified:   9 [32.1%]
Polygon Size Versus County Size            [14.8%]
Average Perimeter Ratio                    [15.0%]
Percentage of Warned Area Verified (15km)  [20.4%]
Average Storm Based Warning Size           [1262 sq km]
Probability of Detection(higher is better) [0.43]
False Alarm Ratio (lower is better)        [0.68]
Critical Success Index (higher is better)  [0.22]

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): 1,677
• Mastodon / Fediverse: 12
• Slack: 38
• Twitter/X: 10,339
• HTTP Webhooks: 21
• Weather.IM Jabber Chatrooms: 10,399