IEM Daily Bulletin for Jun 29 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 29 June 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Jun 28 2:49 PM	pywwa,main	⬆️ Update precommits	Link
Jun 28 2:49 PM	pywwa,main	📝 Add CYB3 pirep	Link

Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 28 Jun 2026 - 12 AM 29 Jun 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	70	15	1	2	4	1	12	2
Flash Flood	23	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:  65 Verified:  30 [46.2%]
Polygon Size Versus County Size            [28.8%]
Average Perimeter Ratio                    [36.5%]
Percentage of Warned Area Verified (15km)  [14.5%]
Average Storm Based Warning Size           [2553 sq km]
Probability of Detection(higher is better) [0.76]
False Alarm Ratio (lower is better)        [0.54]
Critical Success Index (higher is better)  [0.40]

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): 2,064
• Mastodon / Fediverse: 35
• Slack: 102
• Twitter/X: 9,098
• HTTP Webhooks: 189
• Weather.IM Jabber Chatrooms: 13,207