IEM Daily Bulletin for Jun 24 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 24 June 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Jun 23 12:54 PM	iem,main	📝 Update to dep database shard	Link
Jun 23 12:55 PM	iem,main	🔥 Disable Iowa NASS ingest Iowa NASS weekly crop progress is no longer a thing in 2026.	Link
Jun 23 12:55 PM	iem,main	📝 Forgive a provided T	Link
Jun 23 1:39 PM	iem,main	🐛 Encode station as csv	Link
Jun 23 10:48 AM	pyiem,main	🚚 Migrate to dep schema	Link
Jun 23 10:55 AM	pyiem,main	⬆️ Update precommits	Link
Jun 23 7:00 AM	iem-database,main	✨ Create dep schema	Link
Jun 23 9:07 AM	iem-database,main	🚚 Update test data for dep schema	Link
Jun 23 9:10 AM	iem-database,main	📝 Unversioned rectify non-conus dep schema to new dep	Link
Jun 23 9:11 AM	iem-database,main	📝 DEP schema tweaks whilst updating code	Link
Jun 23 9:17 AM	iem-database,main	💚 Fixup! climate_file name	Link
Jun 23 9:31 AM	iem-database,main	💚 Address codereview	Link
Jun 23 10:07 AM	iem-database,main	🎨 Ensure bash is used	Link
Jun 23 11:12 AM	iem-database,main	✏️ Fix typo	Link
Jun 23 1:17 PM	iem-database,main	✨ Add index and constraints on climate_file relation	Link
Jun 23 1:25 PM	iem-database,main	✏️ Replace scenarios with scenario	Link
Jun 23 1:31 PM	iem-database,main	🐛 Address climate_file_id bootstrap	Link
Jun 23 1:23 PM	iem-web-services,main	✨ Allow station to be a csv list	Link
Jun 23 1:24 PM	iem-web-services,main	⬆️ Update ruff precommit	Link

Daily Feature

2026 Tornado Warning Ranks
Date: 23 Jun 05:30 AM
Votes: Good: 14   Bad: 0 Abstain: 1

This past weekend saw another rather significant outbreak of severe weather over Illinois into Indiana. It has been quite the severe weather season over this region as shown by the featured map. The map presents unofficial IEM computed statewide ranks for total number of NWS issued Tornado Warnings. A value of 25 would indicate the most such warnings on record for the given state since at least 2002. The states of Wisconsin, Illinois, and Michigan are shown with the most on record since 2002 with Iowa and Indiana not far behind in relative tally. The map nicely shows the "see-saw" pattern with the near record totals over the eastern corn-belt and much lower values over the southeastern US and especially Texas.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 23 Jun 2026 - 12 AM 24 Jun 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	8	0	0	0	0	0	0	0
Svr Tstorm	185	1	0	0	0	0	1	7
Flash Flood	40	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: 188 Verified:  82 [43.6%]
Polygon Size Versus County Size            [22.2%]
Average Perimeter Ratio                    [22.4%]
Percentage of Warned Area Verified (15km)  [19.7%]
Average Storm Based Warning Size           [1570 sq km]
Probability of Detection(higher is better) [0.89]
False Alarm Ratio (lower is better)        [0.56]
Critical Success Index (higher is better)  [0.41]

IEMBot Social Media Posts

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