IEM Daily Bulletin for Sep 6 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 06 September 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Sep 5 11:56 AM | iem,main | 🎨 Improve hi/lo estimator logic | Link |
| Sep 5 11:57 AM | iem,main | ⬆️ Update ruff | Link |
| Sep 5 3:31 PM | iem,main | 🐛 Fix bug with navbar not appearing on mobile | Link |
| Sep 5 7:56 PM | pyiem,main | 🎨 Improve VTEC typing, adjust skip_con | Link |
| Sep 5 8:12 PM | pyiem,main | 💚 Address coverage | Link |
| Sep 5 8:27 PM | pyiem,main | 🔥 Drop unreachable code | Link |
Daily Feature
September 5th Temps
Date: 05 Sep 05:30 AM
Votes: Good: 11
Bad: 0 Abstain: 0
The featured chart plots a histogram of observed high and low temperatures reported on 5 September for all IEM tracked long term climate sites within Iowa. The solid blue and red lines are observed frequencies with the dashed variants representing an idealized normal distribution based on the denoted statistics. The chart nicely shows the wide range of possibilities this time of year for Iowa with high temperatures above 100°F and low temperatures approaching 32°F. There is also considerable overlap shown between the two distributions with low temps and high temps in the 60s and 70s possible. The forecast for today has the high temps within this range and lows down into the 40s.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 5 Sep 2025 - 12 AM 6 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 | 49 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Flash Flood | 18 | 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: 48 Verified: 26 [54.2%] Polygon Size Versus County Size [23.9%] Average Perimeter Ratio [29.4%] Percentage of Warned Area Verified (15km) [24.0%] Average Storm Based Warning Size [1367 sq km] Probability of Detection(higher is better) [0.85] False Alarm Ratio (lower is better) [0.46] Critical Success Index (higher is better) [0.49]