IEM Daily Bulletin for Nov 18 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 18 November 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Nov 17 12:31 PM | iem,main | ✨ Add NWS 6 Hour Snowfall over 48 Hour JSON https://mesonet.agron.iastate.edu/json/snowfall_observations_v2.py?help |
Link |
| Nov 17 12:44 PM | iem,main | 💚 Address CI failure | Link |
| Nov 17 10:00 AM | iem-web-services,main | ✨ Add wfo filter option to six hour service | Link |
| Nov 17 10:01 AM | iem-web-services,main | ⬆️ Update ruff | Link |
Daily Feature
Both Top 10s
Date: 17 Nov 05:30 AM
Votes: Good: 13
Bad: 0 Abstain: 0
Temperatures last week were a bit of a roller coaster with much of Iowa struggle to warm above freezing on Sunday to record high temperatures by the end of the week. The featured chart presents the daily high temperature departures for Ames. The side panels show the top 10 largest departures for the year. Monday shows up in the top ten coolest and then Saturday for the top ten warmest! These types of swings are more common during the cold season as the lack of humidity and strength of contrasting air masses allow for larger differences within shorter periods of time. Temperatures this week don't look to be as extreme and we will at least see some precipitation chances with a number of passing systems.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 17 Nov 2025 - 12 AM 18 Nov 2025 CST
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Svr Tstorm | 8 | 0 | 0 | 0 | 0 | 1 | 0 | 0 |
| Flash Flood | 3 | 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: 3 [37.5%] Polygon Size Versus County Size [18.3%] Average Perimeter Ratio [32.2%] Percentage of Warned Area Verified (15km) [26.6%] Average Storm Based Warning Size [537 sq km] Probability of Detection(higher is better) [1.00] False Alarm Ratio (lower is better) [0.62] Critical Success Index (higher is better) [0.38]