IEM Daily Bulletin for Aug 22 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 22 August 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Aug 21 7:26 AM | iem,main | 🎨 Use requireElement | Link |
| Aug 21 7:30 AM | iem,main | 💚 Address deepsource concern | Link |
| Aug 21 8:33 AM | iem,main | 🐛 Fix strlen provision | Link |
| Aug 21 10:08 AM | iem,main | ✅ Add test for poor prod regression | Link |
| Aug 21 1:19 PM | iem,main | ⚡️ Template provided headextra should come last | Link |
| Aug 21 1:20 PM | iem,main | 🔥 Drop unused template bodyextra | Link |
| Aug 21 1:43 PM | iem,main | 📝 Sundry ARIA,bootstrap5,icon fixes | Link |
| Aug 21 1:44 PM | iem,main | ⬆️ Update ruff | Link |
Daily Feature
Two-Thirds of Monthly Average
Date: 21 Aug 05:30 AM
Votes: Good: 14
Bad: 0 Abstain: 0
Even with about ten days to go for August, most of the state is already above average for rainfall for the month. August will finish as yet another wet month during 2025. For Ames, only the months of January and February were substantially below their respective long term averages. The monthly reliability of being at or above some average accumulation is the subject of today's featured chart. The chart presents the percentage of years over the past 30 that had a monthly precipitation accumulation of at least 66% of the climatological average. The months of March and October show up as being the least reliable and May being the most. While the differences are not all that large, it is interesting to see how comparable the spring and fall seasons are vs winter and summer. Getting sufficient rainfall during July and August is certainly important to production agriculture as moisture stress negatively impacts yields. You can generate this chart for different sites, periods, and your arbitrary percentage threshold of your choice and see if you can spot any trends!
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 21 Aug 2025 - 12 AM 22 Aug 2025 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Svr Tstorm | 43 | 0 | 0 | 0 | 0 | 0 | 2 | 0 |
| Flash Flood | 13 | 0 | 0 | 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: 48 Verified: 11 [22.9%] Polygon Size Versus County Size [10.5%] Average Perimeter Ratio [23.5%] Percentage of Warned Area Verified (15km) [13.1%] Average Storm Based Warning Size [983 sq km] Probability of Detection(higher is better) [0.61] False Alarm Ratio (lower is better) [0.77] Critical Success Index (higher is better) [0.20]