IEM Daily Bulletin for May 25 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 25 May 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
May 24 3:37 PM	iem,main	📝 Sundry page tweaks and UI improvements	Link
May 24 7:01 AM	pywwa,main	➕ Add CEE6 to pireps	Link

Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 24 May 2026 - 12 AM 25 May 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	5	0	0	0	0	0	0	0
Svr Tstorm	74	3	0	0	0	1	19	1
Flash Flood	36	0	0	0	0	0	1	---

ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD

IEM Cow Report

SVR+TOR Warnings Issued:  78 Verified:  25 [32.1%]
Polygon Size Versus County Size            [27.8%]
Average Perimeter Ratio                    [27.0%]
Percentage of Warned Area Verified (15km)  [17.6%]
Average Storm Based Warning Size           [1104 sq km]
Probability of Detection(higher is better) [0.69]
False Alarm Ratio (lower is better)        [0.68]
Critical Success Index (higher is better)  [0.28]

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): 1,922
• Mastodon / Fediverse: 38
• Slack: 128
• Twitter/X: 9,556
• HTTP Webhooks: 157
• Weather.IM Jabber Chatrooms: 12,783