IEM Daily Bulletin for Jun 22 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 22 June 2025
News
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Daily Feature
Extreme Parameter Space
Date: 21 Jun 09:17 PM
Votes: Good: 1
Bad: 0 Abstain: 0
The weather on Saturday was an extremely rare combination of heat, humidity, and strong winds. Typically, those three don't happen simultaneously as strong winds are more limited during the hottest time of the year and strong winds tend to promote lower atmosphere mixing, which lowers afternoon humidity levels as drier air aloft is mixed down to the surface. For some on Friday and now much of the Midwest on Saturday, the combination of high temperatures, high humidity, and strong winds occupied a parameter space unobserved for many of the major airport weather stations. The featured table presents an unofficial IEM accounting of observations without any comparables. This means that no other observation for the site on record had at least the same temperature, dew point, and wind speed combination shown in the table. To clarify, there have certainly been observations with higher temperatures, dew points, and wind speeds, but none occurring simultaneously. Sunday will be a near repeat of Saturday, so will update the table if new extremes are set tomorrow!
NWS Watch/Warning Summary for 12 AM 21 Jun 2025 - 12 AM 22 Jun 2025 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Svr Tstorm | 69 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Flash Flood | 5 | 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: 75 Verified: 31 [41.3%] Polygon Size Versus County Size [38.4%] Average Perimeter Ratio [25.2%] Percentage of Warned Area Verified (15km) [10.0%] Average Storm Based Warning Size [4539 sq km] Probability of Detection(higher is better) [0.80] False Alarm Ratio (lower is better) [0.59] Critical Success Index (higher is better) [0.37]