IEM Daily Bulletin for Sep 11 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 11 September 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Sep 10 8:10 AM | iem,main | 💚 Add libgdal-grib and fix var reuse per CI | Link |
| Sep 10 9:21 AM | iem,main | ⚡️ Improve CI logic/speed | Link |
| Sep 10 11:55 AM | iem,main | 💚 Omnibus fixes addressing failures without web | Link |
| Sep 10 12:07 PM | iem,main | 💚 Address deepsource and CI concerns | Link |
| Sep 10 12:59 PM | iem,main | 💚 Address some of coverage hit | Link |
| Sep 10 10:57 PM | iem,main | 📝 Sundry rollups and coverage improvements | Link |
Daily Feature
SE Iowa Dryness
Date: 10 Sep 05:30 AM
Votes: Good: 9
Bad: 1 Abstain: 0
Starting around mid-June, much of the state began receiving significant amounts of rainfall and it did not take long to remove all analyzed drought classifications within the US Drought Monitor for Iowa. The wet pattern continued into July, but some parts of the state missed out during August and now with a very dry start to September, drought is again back on many folks minds. One of the driest locations since early August is southeastern Iowa. The featured chart presents trailing 31 day percent of average precipitation totals evaluated each day since the start of 2005. The bottom row of data tells the 2025 story with well above average during early August being replaced with a below average value by September. Rainfall totals over the next seven days look very meager and with increasing temperatures, additional drought impacts will likely show up shortly.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 10 Sep 2025 - 12 AM 11 Sep 2025 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Svr Tstorm | 20 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Flash Flood | 3 | 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: 20 Verified: 4 [20.0%] Polygon Size Versus County Size [10.6%] Average Perimeter Ratio [12.0%] Percentage of Warned Area Verified (15km) [5.1%] Average Storm Based Warning Size [1477 sq km] Probability of Detection(higher is better) [0.27] False Alarm Ratio (lower is better) [0.80] Critical Success Index (higher is better) [0.13]