IEM Daily Bulletin for May 3 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 03 May 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
May 2 7:16 AM	iem,main	♻️ Use json_response_dict helper	Link
May 2 7:17 AM	iem,main	⬆️ Update eslint precommit	Link
May 2 7:22 AM	iem,main	✏️ Fix typo	Link

Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 2 May 2026 - 12 AM 3 May 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	0	0	0	0	0	0	0	1
Svr Tstorm	8	0	0	0	0	0	0	0
Flash Flood	0	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:   8 Verified:   3 [37.5%]
Polygon Size Versus County Size            [21.1%]
Average Perimeter Ratio                    [12.5%]
Percentage of Warned Area Verified (15km)  [18.9%]
Average Storm Based Warning Size           [1213 sq km]
Probability of Detection(higher is better) [0.80]
False Alarm Ratio (lower is better)        [0.62]
Critical Success Index (higher is better)  [0.34]

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): 1,263
• Mastodon / Fediverse: 10
• Slack: 27
• Twitter/X: 6,802
• HTTP Webhooks: 111
• Weather.IM Jabber Chatrooms: 8,419