IEM Daily Bulletin for Dec 19 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 19 December 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Dec 18 8:42 AM | iem,main | 🎨 Goose wetbulb-awips color ramp https://mesonet.agron.iastate.edu/plotting/auto/?q=192 |
Link |
| Dec 18 10:05 AM | iem,main | ✨ Increase itersize | Link |
| Dec 18 10:34 AM | iem,main | ⚡️ Throttle the AI bots some more | Link |
| Dec 18 11:13 AM | iem,main | ⚡️ Additional AI bot throttles | Link |
Daily Feature
Snow depth and highs
Date: 18 Dec 05:30 AM
Votes: Good: 17
Bad: 1 Abstain: 0
Yesterday's daily feature noted how afternoon high temperatures on Tuesday were cooler over areas with deeper snow cover. The same situation happened on Wednesday and today's featured chart takes a more direct comparison between the two. The chart compares high temperatures on Wednesday from the airport weather stations (ASOS) with a grid analyses of snow depth valid at each observation point during the morning hours. The relationship shown is quite clear with locations having deeper snow struggling to reach 40°F while other locations with less snow were able to warm well into the 40s and even low 50s. This same situation will repeat over the coming days as the snow field continues shrink each day.
NWS Watch/Warning Summary for 12 AM 18 Dec 2025 - 12 AM 19 Dec 2025 CST
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Svr Tstorm | 33 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Flash Flood | 0 | 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: 34 Verified: 9 [26.5%] Polygon Size Versus County Size [41.5%] Average Perimeter Ratio [41.6%] Percentage of Warned Area Verified (15km) [13.5%] Average Storm Based Warning Size [1835 sq km] Probability of Detection(higher is better) [0.44] False Alarm Ratio (lower is better) [0.74] Critical Success Index (higher is better) [0.20]