IEM Daily Bulletin for Aug 19 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 19 August 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Aug 18 7:15 AM | pyiem,main | ⬆️ Update ruff | Link |
| Aug 18 7:21 AM | pyiem,main | 🎨 Forgive 3char TAF station ID | Link |
| Aug 18 7:52 AM | pyiem,main | 📝 Account for more TAF quirks | Link |
| Aug 18 8:03 AM | pyiem,main | ✏️ Denote the examples are from 2008 | Link |
| Aug 18 12:23 PM | pyiem,main | 💥 Support TAF Collectives closes #913 by breaking prod.data from type TAFReport to list[TAFReport] |
Link |
| Aug 18 12:26 PM | pyiem,main | 💚 Address deepsource API concern | Link |
| Aug 18 1:15 PM | pyiem,main | 🎨 Allow for TAF AMD | Link |
| Aug 18 1:48 PM | pyiem,main | 🎨 Allow for more TAF one-offs | Link |
| Aug 18 9:24 AM | iem-database,main | ✨ Add storage of DOT Roadway Cams refs akrherz/iemone#47 |
Link |
| Aug 18 9:25 AM | iem-database,main | ⬆️ Update ruff | Link |
Daily Feature
Steamy 2025 State Fair
Date: 18 Aug 05:30 AM
Votes: Good: 10
Bad: 0 Abstain: 0
The Iowa State Fair concluded on Sunday with quite steamy conditions with heat index values above 100°F. Using the Des Moines Airport hourly weather reports as a close proxy to the fair conditions, the featured chart presents an IEM accounting of the number of hours each year during the days of the fair with a heat index of at least 86°F. While data does exist prior to 1973, this chart starts off during that year due to observation changes and a troublesome period prior to 1973 with only three-hourly reports. The 2025 total is the highest since 2010 and well within the top 10 for this plotted period. The steamy weather will stick around for a few more days this week before much more pleasant conditions arrive and last into the weekend.
NWS Watch/Warning Summary for 12 AM 18 Aug 2025 - 12 AM 19 Aug 2025 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Svr Tstorm | 108 | 2 | 0 | 6 | 0 | 1 | 1 | 3 |
| Flash Flood | 31 | 2 | 1 | 0 | 0 | 0 | 1 | --- |
ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD
IEM Cow Report
SVR+TOR Warnings Issued: 109 Verified: 30 [27.5%] Polygon Size Versus County Size [19.0%] Average Perimeter Ratio [25.4%] Percentage of Warned Area Verified (15km) [13.0%] Average Storm Based Warning Size [1113 sq km] Probability of Detection(higher is better) [0.61] False Alarm Ratio (lower is better) [0.72] Critical Success Index (higher is better) [0.23]