IEM Daily Bulletin for Mar 20 2026
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 20 March 2026
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Mar 19 9:12 AM | iem,main | ✏️ Address ldm product name for vsby plot | Link |
| Mar 19 9:44 AM | iem,main | 🔥 Remove legacy service without current data | Link |
| Mar 19 10:08 AM | iem,main | 🎨 Move agclimate/search through central dispatch | Link |
| Mar 19 1:32 PM | iem,main | 🚀 Use mod_wsgi-express backend for tilecache This is a smoke test of a future hope for this repo. |
Link |
| Mar 19 1:34 PM | iem,main | 💚 CI: Use updated akrherz/ci_tooling action | Link |
| Mar 19 6:12 PM | iem,main | 💚 CI: pin libnetcdf again due to unknown things | Link |
| Mar 19 10:50 PM | iem,main | 🎨 Address mod_wsgi-express issues found with smoketest | Link |
| Mar 19 11:05 PM | iem,main | ✨ Add simple magnitude filter on LSR download https://mesonet.agron.iastate.edu/request/gis/lsrs.phtml |
Link |
Daily Feature
Largest Warmups After Snowfall
Date: 19 Mar 05:30 AM
Votes: Good: 12
Bad: 0 Abstain: 0
Iowans have seen quite the roller coaster of conditions so far this March with snowfalls earlier this week now giving way to very warm temperatures. On Tuesday, Des Moines reported 0.5 inches of snowfall and then a high temperature of 64°F on the next day. This seems like a rather extreme combination of daily weather variables, so a new "IEM autoplot tool" has been added in this space to list out such combination of weather events. In this case, the combination of having measurable snowfall reported and then the following day high temperature is listed out showing the highest and lowest next day high temperature values. You can find the 17-18 March 2026 event listed within this summary, but 14°F less than the maximum of 78°F back in 1918. This autoplot tool can be used to generate many different arbitrary combinations of events and then preceding or proceeding number of days weather variables. For example, the tool indicates Washington DC just had its maximum high temperature 86°F on the day before a snowfall event last week! As with the entire IEM website, your feedback is welcome and guides tool development!
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 19 Mar 2026 - 12 AM 20 Mar 2026 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 | 0 | 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
No SVR+TOR Warnings Issued.
IEMBot Social Media Posts
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Posts yesterday per supported service:
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