IEM Daily Bulletin for Jun 25 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 25 June 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Jun 24 9:46 AM	iem,main	🐛 Fix table3 export buttons in vtec search	Link
Jun 24 8:14 AM	pyiem,main	✨ Add VTEC CON creates logic If a UGC gets CON'd without a database entry, an entry is created.	Link
Jun 24 8:21 AM	pyiem,main	💚 Address coverage	Link

Daily Feature

Mason City Warmest Low
Date: 24 Jun 05:30 AM
Votes: Good: 9   Bad: 0 Abstain: 1

Our recent few days of weather have seen hot, humid, and quite windy conditions. The elevated humidity levels and persistent night-time winds helped to buoy over-night air temperatures with many sites setting daily records for warmest low temperatures. Mason City (NC Iowa) reported a low temperature of 77°F on Saturday, which established a new June record for the site. The featured chart presents the monthly warmest low temperatures for Mason City. The right hand side cartoons show the dates of the month where the given month's records reside.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 24 Jun 2025 - 12 AM 25 Jun 2025 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	2	0	0	0	0	0	0	0
Svr Tstorm	77	0	0	1	0	0	0	1
Flash Flood	34	2	0	0	1	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:  77 Verified:  35 [45.5%]
Polygon Size Versus County Size            [14.6%]
Average Perimeter Ratio                    [18.5%]
Percentage of Warned Area Verified (15km)  [26.4%]
Average Storm Based Warning Size           [868 sq km]
Probability of Detection(higher is better) [0.75]
False Alarm Ratio (lower is better)        [0.55]
Critical Success Index (higher is better)  [0.40]