IEM Daily Bulletin for Mar 7 2026
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 07 March 2026
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Mar 6 9:49 AM | iem,main | ✏️ Update to V07C for IMERG ingest per #1518 | Link |
| Mar 6 1:13 PM | iem,main | ⬆️ Update ruff precommit | Link |
| Mar 6 1:14 PM | iem,main | 📝 Sundry updates per log review | Link |
| Mar 6 1:36 PM | iem,main | 🐛 Two char network is allowed | Link |
| Mar 6 3:04 PM | iem,main | 🎨 Improve bootstrap5 usage | Link |
| Mar 6 3:04 PM | iem,main | ✨ Add CCI calculation to ISUSM hourly download | Link |
| Mar 6 3:32 PM | iem,main | 🎨 Implement more iemweb.fields usage | Link |
| Mar 6 10:07 PM | iem,main | 🎨 Cleanup mess made with outlook JSON service https://mesonet.agron.iastate.edu/json/spcoutlook.py?help |
Link |
| Mar 6 10:07 PM | iem,main | 🎨 Address some typing | Link |
Daily Feature
Thunder Season
Date: 06 Mar 05:30 AM
Votes: Good: 14
Bad: 0 Abstain: 0
Thunderstorms rolled into Iowa late Thursday night and will abound today bringing much needed rainfall to the state. Having such storms during the first week of March is nothing too exceptional as shown by the featured chart. The chart presents a heatmap of Des Moines airport weather reports of thunder by week of the year and by hour of the day. The side bar charts present the histograms for each. The chart shows an increase in such activity starting about mid February and roughly increasing each week until peaking in mid June. The chart nicely shows how most of the thunder reports are during the night time hours for central Iowa as activity is often driven by the "low level jet" persisting thunderstorm complexes that develop over the plains and then move east overnight. The early spring and late fall activity shows less of a strong overnight signal as these time periods are more dominated by larger scale low pressure systems that impact the state and more tied to daylight heating driving thunderstorm activity.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 6 Mar 2026 - 12 AM 7 Mar 2026 CST
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 5 |
| Svr Tstorm | 107 | 7 | 0 | 1 | 2 | 12 | 0 | 2 |
| Flash Flood | 8 | 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: 125 Verified: 38 [30.4%] Polygon Size Versus County Size [32.3%] Average Perimeter Ratio [31.9%] Percentage of Warned Area Verified (15km) [11.5%] Average Storm Based Warning Size [1523 sq km] Probability of Detection(higher is better) [0.66] False Alarm Ratio (lower is better) [0.70] Critical Success Index (higher is better) [0.26]
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): 2,096
- Mastodon / Fediverse: 33
- Slack: 1,948
- Twitter/X: 22,275
- HTTP Webhooks: 48
- Weather.IM Jabber Chatrooms: 14,894