IEM Daily Bulletin for Oct 17 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 17 October 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Oct 16 11:18 AM | iem,main | 📝 Polish static windrose frontend page | Link |
| Oct 16 2:32 PM | iem,main | 📝 Sundry updates per review | Link |
Daily Feature
Latest Fall Dates
Date: 16 Oct 05:30 AM
Votes: Good: 9
Bad: 3 Abstain: 0
The forecast has a good portion of Iowa reaching 80°F degrees today and some seeing such warm temperatures again tomorrow. It is certainly getting a bit late in the year for such warm temperatures to be observed. The featured chart presents the accumulated frequency of a given date having seen its last daily high temperature threshold of the year for Ames. The table at the side presents the percentile values. The combination of the 80°F threshold and 16 October comes in above the 70th percentile or rewording, seven out of ten years had seen their last 80+ degree temperature of the year by today's day of the year. Three other temperature thresholds are plotted for comparison with frequencies at 70°F and today's date being much lower, so such temperatures are more likely than not for at least one more week!
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 16 Oct 2025 - 12 AM 17 Oct 2025 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 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Flash Flood | 2 | 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: 8 Verified: 1 [12.5%] Polygon Size Versus County Size [16.7%] Average Perimeter Ratio [19.7%] Percentage of Warned Area Verified (15km) [6.4%] Average Storm Based Warning Size [1479 sq km] Probability of Detection(higher is better) [1.00] False Alarm Ratio (lower is better) [0.88] Critical Success Index (higher is better) [0.12]