IEM Daily Bulletin for Jul 27 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 27 July 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 26 Jul 2026 - 12 AM 27 Jul 2026 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	75	1	0	0	1	0	0	2
Flash Flood	15	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:  74 Verified:  39 [52.7%]
Polygon Size Versus County Size            [27.2%]
Average Perimeter Ratio                    [32.5%]
Percentage of Warned Area Verified (15km)  [30.0%]
Average Storm Based Warning Size           [1425 sq km]
Probability of Detection(higher is better) [0.83]
False Alarm Ratio (lower is better)        [0.47]
Critical Success Index (higher is better)  [0.48]

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): 2,270
• Mastodon / Fediverse: 42
• Slack: 2,338
• Twitter/X: 10,591
• HTTP Webhooks: 227
• Weather.IM Jabber Chatrooms: 14,010