IEM Daily Bulletin for Aug 7 2026
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 07 August 2026
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Aug 6 8:48 AM | iem,main | ✨ Merge ECMWF IFS hourly into IEMRE for forecast This will support some upcoming forecast product needs |
Link |
| Aug 6 8:59 AM | iem,main | 🚩 Run IEMRE daily analysis for forecast dates | Link |
| Aug 6 9:37 AM | iem,main | 📝 Sundry doc cleanups, link fixes, autoplot tweaks | Link |
| Aug 6 9:54 AM | iem,main | 💚 Address codereview | Link |
| Aug 6 11:51 AM | iem,main | 🚀 Denote MRMS hourly zip file downsizing Archive file service is not useful given current cloud archives. https://mesonet.agron.iastate.edu/archive/mrms.php |
Link |
| Aug 6 12:08 PM | iem,main | 📝 Sundry fixes | Link |
| Aug 6 2:46 PM | iem,main | ⚡️ Refactor and dl entire IFS omfile, fsspec slow | Link |
| Aug 6 7:36 AM | pyiem,main | 🎨 Improve PTS warning message for reversed poly | Link |
| Aug 6 7:38 AM | pyiem,main | ⬆️ Update precommits | Link |
Daily Feature
First Sub 70°F High
Date: 06 Aug 05:30 AM
Votes: Good: 14
Bad: 2 Abstain: 0
For the first week of August, Wednesday was a very cool day with a number of locations unable to reach a high temperature of 70°F. One such location was Waterloo with a high of just 69°F. The featured chart looks into the accumulated frequency by fall season date for the first sub threshold daily high temperature. The algorithm considers any post 1 July date as the "fall season", but starts the plot on 1 August. For the sub 70°F threshold, yesterday's value comes in around the 10th percentile. Rewording, about one in ten years have seen such a cool high by the 5th of August. Some selected lower thresholds are plotted as well with sub 65°F having a much lower accumulated frequency until about the last week of August. We are still squarely within the summer season for Iowa, so these respites from the heat should be enjoyed!
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 6 Aug 2026 - 12 AM 7 Aug 2026 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 | 118 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Flash Flood | 41 | 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: 114 Verified: 54 [47.4%] Polygon Size Versus County Size [14.7%] Average Perimeter Ratio [27.3%] Percentage of Warned Area Verified (15km) [27.5%] Average Storm Based Warning Size [1250 sq km] Probability of Detection(higher is better) [0.83] False Alarm Ratio (lower is better) [0.53] Critical Success Index (higher is better) [0.43]
IEMBot Social Media Posts
IEMBot can be configured to post messages to a number of social media services. More details: IEMBot Homepage.
Posts yesterday per supported service:
- ATMosphere (bluesky only attm): 2,565
- Mastodon / Fediverse: 13
- Slack: 1,980
- Twitter/X: 11,571
- HTTP Webhooks: 277
- Weather.IM Jabber Chatrooms: 14,270