IEM Daily Bulletin for Jun 28 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 28 June 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

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Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 27 Jun 2026 - 12 AM 28 Jun 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	21	0	0	0	0	0	0	1
Svr Tstorm	198	0	0	0	0	0	0	7
Flash Flood	73	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: 210 Verified:  78 [37.1%]
Polygon Size Versus County Size            [24.3%]
Average Perimeter Ratio                    [27.1%]
Percentage of Warned Area Verified (15km)  [10.8%]
Average Storm Based Warning Size           [2710 sq km]
Probability of Detection(higher is better) [0.72]
False Alarm Ratio (lower is better)        [0.63]
Critical Success Index (higher is better)  [0.32]

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): 2,440
• Mastodon / Fediverse: 39
• Slack: 78
• Twitter/X: 11,070
• HTTP Webhooks: 193
• Weather.IM Jabber Chatrooms: 16,523