IEM Daily Bulletin for May 31 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 31 May 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
May 30 7:48 AM	iem-web-services,main	🐛 Fix syslog path within container	Link

Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 30 May 2026 - 12 AM 31 May 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	7	0	0	0	0	0	0	1
Svr Tstorm	129	0	0	0	0	2	0	3
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: 135 Verified:  62 [45.9%]
Polygon Size Versus County Size            [23.8%]
Average Perimeter Ratio                    [26.3%]
Percentage of Warned Area Verified (15km)  [18.4%]
Average Storm Based Warning Size           [1671 sq km]
Probability of Detection(higher is better) [0.81]
False Alarm Ratio (lower is better)        [0.54]
Critical Success Index (higher is better)  [0.42]

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): 2,153
• Mastodon / Fediverse: 28
• Slack: 56
• Twitter/X: 8,870
• HTTP Webhooks: 182
• Weather.IM Jabber Chatrooms: 12,080