IEM Daily Bulletin for Aug 28 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 28 August 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Aug 27 9:17 AM | iem,main | 🎨 Cleanup and increase testing of PHP content | Link |
| Aug 27 11:56 AM | iem,main | 📝 Address sundry lint | Link |
| Aug 27 12:31 PM | iem,main | ✨ Start a cache of midwest winter roads | Link |
| Aug 27 12:41 PM | iem,main | 💚 Address CI issues with enhanced testing | Link |
| Aug 27 9:23 AM | iem-database,main | 📝 Add RH trigger on current_log as well | Link |
Daily Feature
August Precip Totals
Date: 27 Aug 05:30 AM
Votes: Good: 6
Bad: 0 Abstain: 0
While there are a few chances of precipitation over the coming days to close out August, the areal averaged statewide total is very likely to come in below average as shown by the featured chart. The chart presents the IEM estimated August precipitation totals for Iowa. A trailing 30 year average is plotted along with period of record and a thirty year average. Six out of the previous seven years have been below long term average with 2020 and now this year coming in significantly below average. While the statewide number is below average for August, a number of locations in the state are well above their respective averages from the numerous heavy rainfall events to start off the month.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 27 Aug 2025 - 12 AM 28 Aug 2025 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Svr Tstorm | 21 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| Flash Flood | 11 | 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: 24 Verified: 3 [12.5%] Polygon Size Versus County Size [7.3%] Average Perimeter Ratio [15.7%] Percentage of Warned Area Verified (15km) [10.2%] Average Storm Based Warning Size [696 sq km] Probability of Detection(higher is better) [0.50] False Alarm Ratio (lower is better) [0.88] Critical Success Index (higher is better) [0.11]