IEM Daily Bulletin for Sep 18 2025
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 18 September 2025
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Sep 17 12:35 PM | pywwa,main | ⬆️ Update ruff | Link |
| Sep 17 12:35 PM | pywwa,main | 🐛 Send FFWPPG through generic_product | Link |
| Sep 17 1:02 PM | pywwa,main | 🎨 Address deprecation | Link |
| Sep 17 10:00 PM | iem-database,main | ⬆️ Update rufff | Link |
| Sep 17 10:01 PM | iem-database,main | ✅ Add WMO BUFR SRF archive data for testing | Link |
Daily Feature
Starting Corn Harvest
Date: 17 Sep 05:30 AM
Votes: Good: 10
Bad: 1 Abstain: 2
While the current weather feels more like summer than early fall, farmers have gotten started with the fall harvest season. The most recent weekly update from USDA NASS estimates 3% of the corn grain crop harvested within Iowa. The featured map presents the statewide estimates and a percentage points departure from a simple ten year average. The corn crop is generally planted to maximize yield potential from the available growing season, so crops tend to only reach maturity just before climatology says killing frosts occur. The corn crop also needs time to dry down prior to harvest, so only so much progress is possible this early in the season for Iowa.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 17 Sep 2025 - 12 AM 18 Sep 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 | 95 | 6 | 0 | 0 | 6 | 0 | 0 | 1 |
| Flash Flood | 8 | 1 | 0 | 0 | 1 | 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: 94 Verified: 18 [19.1%] Polygon Size Versus County Size [9.9%] Average Perimeter Ratio [20.7%] Percentage of Warned Area Verified (15km) [11.5%] Average Storm Based Warning Size [751 sq km] Probability of Detection(higher is better) [0.63] False Alarm Ratio (lower is better) [0.81] Critical Success Index (higher is better) [0.17]