IEM Daily Bulletin for Aug 14 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 14 August 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Aug 13 10:42 AM | iem,main | 📝 Lower arb QC threshold | Link |
| Aug 13 11:15 AM | iem,main | 🎨 Fix UI issues with IEM Explorer https://mesonet.agron.iastate.edu/explorer/ |
Link |
| Aug 13 11:33 AM | iem,main | 💚 Address javascript chaining lint | Link |
| Aug 13 8:37 AM | pyiem,main | 🔥 Drop is_tempo database storage no longer needed with #1104 |
Link |
| Aug 5 6:17 AM | pywwa,main | 📝 Add CNP4 | Link |
| Aug 13 7:57 AM | pywwa,main | 📝 Add CAH5 | Link |
| Aug 13 8:48 AM | iem-database,main | ✏️ Finalize is_tempo database pivot | Link |
| Aug 13 8:54 AM | iem-database,main | 🔥 Drop is_tempo in test data | Link |
| Aug 13 6:26 AM | iem-web-services,main | 📝 TAF ftype updates per akrherz/pyIEM#1104 🐛 Fix intermediate bug |
Link |
| Aug 13 7:48 AM | iem-web-services,main | 💚 Drop codecov token usage | Link |
Daily Feature
First Fall Low Temp Dates
Date: 13 Aug 05:30 AM
Votes: Good: 8
Bad: 0 Abstain: 0
The official low temperature for Des Moines has yet to breach 60°F since the first of July. The featured chart presents accumulated frequencies of having the first fall season (after 1 July) temperature below the given threshold by the given date of the year. For August 12th and 60 degrees, the frequency is about 80%, so about four out of every five years have seen such a cool temperature by the current date. The chart also shows three other thresholds for comparison. Frequencies of the first sub 50 really start to increase by the end of next week, but the 50 percent value does not come until September. The urban heat island of Des Moines certainly helps to buoy overnight temperatures as sub-60 values will be common this week outside of city including those this Wednesday morning.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 13 Aug 2025 - 12 AM 14 Aug 2025 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Svr Tstorm | 79 | 0 | 0 | 0 | 0 | 1 | 2 | 1 |
| Flash Flood | 41 | 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: 75 Verified: 41 [54.7%] Polygon Size Versus County Size [27.4%] Average Perimeter Ratio [33.9%] Percentage of Warned Area Verified (15km) [23.3%] Average Storm Based Warning Size [2299 sq km] Probability of Detection(higher is better) [0.71] False Alarm Ratio (lower is better) [0.45] Critical Success Index (higher is better) [0.45]