IEM Daily Bulletin for Jun 26 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 26 June 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Jun 25 9:32 AM | iem,main | ✨ Add bling to obhistory listing https://mesonet.agron.iastate.edu/sites/obhistory.php?station=AMW&network=IA_ASOS |
Link |
| Jun 25 12:05 PM | iem,main | 🐛 Ensure PK WND comes along for HFMETAR ride | Link |
| Jun 25 3:41 PM | iem,main | ✨ Add bling to COOP extremes app https://mesonet.agron.iastate.edu/COOP/extremes.php |
Link |
| Jun 25 3:42 PM | iem,main | 🎨 Modernize more javascript + bootstrap5 | Link |
| Jun 25 4:51 PM | iemone,main | 🐛 Make sbw/sps popups work again | Link |
| Jun 25 8:05 AM | iem-web-services,main | ⬆️ Update ruff | Link |
| Jun 25 8:09 AM | iem-web-services,main | ✨ Add PK WND METAR information to obhistory | Link |
Daily Feature
Flash Flood Warning Issuance
Date: 25 Jun 05:30 AM
Votes: Good: 10
Bad: 1 Abstain: 0
On Tuesday morning, National Weather Service Des Moines issued a Flash Flood Warning over a portion of southern Iowa due to an ongoing heavy rainfall event that brought three inches plus overnight. This warning was issued during the 6 AM hour and the featured chart today looks into the timing of the warning issuance based on text product archives dating back to 2002 for the office. The chart summarizes the number of warnings issued by hour and week of the year. The right hand side numbers present the hourly totals. The early evening hours are the most frequent time of day as late afternoon thunderstorms driven by the heating of the day have a number of hours to produce enough rainfall to lead to flooding. The early afternoon hours are the least frequent as storms are typically yet to get started by that time. The seasonality is clear as well with the largest frequencies from late May through July as storms tend to not move as quickly and thus produce larger rainfall totals over more isolated areas.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 25 Jun 2025 - 12 AM 26 Jun 2025 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 19 | 2 | 7 | 0 | 1 | 0 | 0 | 1 |
| Svr Tstorm | 317 | 6 | 3 | 5 | 2 | 2 | 0 | 3 |
| Flash Flood | 24 | 3 | 0 | 0 | 2 | 3 | 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: 329 Verified: 171 [52.0%] Polygon Size Versus County Size [28.7%] Average Perimeter Ratio [27.1%] Percentage of Warned Area Verified (15km) [29.7%] Average Storm Based Warning Size [1282 sq km] Probability of Detection(higher is better) [0.85] False Alarm Ratio (lower is better) [0.48] Critical Success Index (higher is better) [0.48]