IEM Daily Bulletin for Aug 8 2026
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 08 August 2026
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Aug 7 7:58 AM | iem,main | 🐛 Cleanups to IEMRE multiday service | Link |
| Aug 7 10:59 AM | iem,main | ✨ Add key_messages_afd option to AFOS service https://mesonet.agron.iastate.edu/cgi-bin/afos/retrieve.py?help |
Link |
| Aug 7 12:38 PM | pyiem,main | ⬆️ Update ruff precommit | Link |
| Aug 7 1:01 PM | pyiem,main | 💚 Add missing iemre_sa host for CI | Link |
| Aug 7 2:43 PM | pyiem,main | ✨ Support CFS in grb2iemre | Link |
| Aug 7 11:36 PM | pyiem,main | 🐛 Workaround longlat grb2iemre grid starting at 0° | Link |
| Aug 7 11:48 PM | pyiem,main | 💚 Apply suggested better check | Link |
| Aug 7 7:14 AM | iem-web-services,main | 🎨 CI: move data setup to isolated script | Link |
| Aug 7 7:14 AM | iem-web-services,main | ✨ CFS rides again in drydown service | Link |
| Aug 7 7:21 AM | iem-web-services,main | 💚 Address CI failure codereview | Link |
| Aug 7 7:26 AM | iem-web-services,main | 💚 Address CI failures | Link |
Daily Feature
Timing of Dense Fog Advisories
Date: 07 Aug 05:30 AM
Votes: Good: 7
Bad: 0 Abstain: 0
One of the most frequently issued National Weather Service headlines is the ever exciting Dense Fog Advisory. A number of such advisories have been issued over Iowa this week as a cooler air mass has interacted with late summer elevated humidity. The featured chart looks into the frequency of such advisories issued by NWS Des Moines by time of day. The chart presents the summer season (June, July, August) frequency along with the overall full year frequency. The difference between the two is quite informative. During the summer season, solar inputs are very strong and will work to "burn off" the fog pretty much every day. Of course, there is no "burning" process, but a process of heating the ground, heating the lower atmosphere and reducing relative humidity levels. Such is the case again this Friday with morning fog and a number of advisories currently active.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 7 Aug 2026 - 12 AM 8 Aug 2026 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 7 | 7 | 1 | 5 | 1 | 0 | 0 | 0 |
| Svr Tstorm | 221 | 26 | 3 | 13 | 8 | 0 | 8 | 3 |
| Flash Flood | 74 | 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: 226 Verified: 109 [48.2%] Polygon Size Versus County Size [20.7%] Average Perimeter Ratio [23.8%] Percentage of Warned Area Verified (15km) [28.7%] Average Storm Based Warning Size [1173 sq km] Probability of Detection(higher is better) [0.80] False Alarm Ratio (lower is better) [0.52] 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:
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- Mastodon / Fediverse: 21
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