IEM Daily Bulletin for Jul 24 2026
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 24 July 2026
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Jul 23 10:41 PM | iem,main | ✨ Flag daily records https://mesonet.agron.iastate.edu/plotting/auto/?q=113 |
Link |
| Jul 23 10:49 PM | iem,main | 💚 Address codereview | Link |
| Jul 23 1:01 PM | pywwa,main | ⬆️ Update ruff precommit | Link |
| Jul 23 1:07 PM | pywwa,main | ✨ Add fake AFOS entries for ADMN75 SEXX01 | Link |
| Jul 23 1:39 PM | pywwa,main | 🎨 Ignore .vscode | Link |
Daily Feature
Wonderful Sub 60°F Dew Point
Date: 23 Jul 05:30 AM
Votes: Good: 13
Bad: 1 Abstain: 1
For mid July, the weather does not get much nicer than what Iowans experienced on Wednesday with high temperatures in the 70s and dew points mostly in the 50s. Based on hourly reports, the maximum dew point for Des Moines was just 59°F. The featured chart looks into the frequency of having a sub 60°F maximum daily dew point. The top panel presents the daily maximum dew point climatology along with the 2025 and 2026 observations. The 59°F value yesterday is highlighted by the red box and you have to back to late June to find as low of a value. The bottom panel directly addresses the frequency question of today's feature and shows the mid July value near 5%. The nice weather was very welcome for all of the bike riders currently on RAGBRAI!
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 23 Jul 2026 - 12 AM 24 Jul 2026 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Svr Tstorm | 46 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Flash Flood | 31 | 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: 46 Verified: 8 [17.4%] Polygon Size Versus County Size [13.3%] Average Perimeter Ratio [25.8%] Percentage of Warned Area Verified (15km) [7.1%] Average Storm Based Warning Size [1312 sq km] Probability of Detection(higher is better) [0.53] False Alarm Ratio (lower is better) [0.83] Critical Success Index (higher is better) [0.15]
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): 2,201
- Mastodon / Fediverse: 20
- Slack: 1,516
- Twitter/X: 8,588
- HTTP Webhooks: 143
- Weather.IM Jabber Chatrooms: 11,496