IEM Daily Bulletin for May 15 2026
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 15 May 2026
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| May 14 8:03 AM | iem,main | 🐛 Compute MD5 from LDM product name | Link |
| May 14 9:18 AM | iem,main | 🐛 Address range bin edge cases | Link |
| May 14 10:00 AM | iem,main | ♻️ Replace JQuery with vanilla JS and refactor | Link |
| May 14 10:03 AM | iem,main | 📝 Fix boostrap CSS used on Tall Towers page https://mesonet.agron.iastate.edu/projects/iao/ |
Link |
| May 14 10:29 PM | iem,main | ✨ Add PWINO option to recent METARs app + cleanups https://mesonet.agron.iastate.edu/ASOS/recent.phtml?report=pwino |
Link |
| May 14 10:38 PM | iem,main | ⬆️ Update ruff precommit | Link |
| May 14 10:43 PM | iem,main | 🎨 Add and fix eslint curly rule | Link |
| May 14 10:55 PM | iem,main | 💚 Address codereview | Link |
| May 14 8:52 AM | pyiem,main | 🎨 Raise BadWebRequest on list provided to autoplot This tightens when lists of strings are allowed into autoplot context parsing. |
Link |
| May 14 8:58 AM | pyiem,main | ✏️ Correct the typing declaration of value | Link |
Daily Feature
Thinking of Summer
Date: 14 May 05:30 AM
Votes: Good: 10
Bad: 0 Abstain: 0
For Iowa State students, this is Finals week. For K-12 students, just a few weeks of school remain until summer break. So it is a good time to think about summer and present a metric to compute when the summer season begins. If you consider the summer season as the warmest consecutive 91 day period (1/4th of the year) each year, the featured chart plots the start date each year for this period for Ames. The dots are colored by the average temperature departure for this period over all years. A simple linear trend line is plotted as well. The overall average is around 7 June, which just over three weeks away, but plenty of years got started in just over week from now.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 14 May 2026 - 12 AM 15 May 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 | 56 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
| 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: 56 Verified: 16 [28.6%] Polygon Size Versus County Size [37.6%] Average Perimeter Ratio [29.3%] Percentage of Warned Area Verified (15km) [7.4%] Average Storm Based Warning Size [3082 sq km] Probability of Detection(higher is better) [0.57] False Alarm Ratio (lower is better) [0.71] Critical Success Index (higher is better) [0.24]
IEMBot Social Media Posts
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Posts yesterday per supported service:
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