IEM Daily Bulletin for Apr 28 2026
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 28 April 2026
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Apr 27 10:57 AM | iem,main | 🐛 Correct call signature for etn | Link |
| Apr 27 2:02 PM | iem,main | 🔥 Drop FA from SBW display in rview app | Link |
| Apr 27 7:36 PM | iem,main | 🐛 Retain URL provided ugc= when mode=byugc | Link |
| Apr 27 8:26 PM | iem,main | 💚 Address codereview concern with mode setting | Link |
| Apr 27 1:25 PM | pyiem,main | 🔥 Drop IEM Access write of DSM wind info | Link |
| Apr 27 9:55 PM | pyiem,main | 🎨 Handle exception from memcache | Link |
| Apr 27 10:04 PM | pyiem,main | 💚 Address codereview wanting close | Link |
| Apr 27 10:33 AM | iemvtec,main | ⬆️ Update eslint precommit | Link |
| Apr 27 11:38 AM | iemvtec,main | 🎨 Prevent some NaN GIGO | Link |
Daily Feature
Perfect Date of April 25
Date: 27 Apr 05:30 AM
Votes: Good: 18
Bad: 0 Abstain: 2
The weather on Saturday (April 25th) was nothing short of amazing with hazy sunshine, pleasant temperatures, low humidity, and a gentle breeze. The weather and date matched the description by Ms Rhode Island in the movie "Miss Congeniality" of a "perfect date" being "April 25th, because it's not too hot, not too cold. All you need is a light jacket." So the daily feature chart plots the frequency by day of the year of having a high temperature in the low 70s, a daily average wind speed below 10 MPH, and a maximum dew point below 50°F. The black line plots the combined combination of those three. The spring and fall months of April, May, September, and October are generally the preferred time of year for such a combination to occur. The weather today will much different than Saturday with chances of severe weather along with more windy and humid conditions.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 27 Apr 2026 - 12 AM 28 Apr 2026 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 82 | 0 | 1 | 0 | 0 | 0 | 0 | 5 |
| Svr Tstorm | 356 | 4 | 1 | 2 | 1 | 0 | 0 | 7 |
| Flash Flood | 35 | 1 | 0 | 1 | 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: 423 Verified: 178 [42.1%] Polygon Size Versus County Size [35.4%] Average Perimeter Ratio [35.2%] Percentage of Warned Area Verified (15km) [20.1%] Average Storm Based Warning Size [1663 sq km] Probability of Detection(higher is better) [0.87] False Alarm Ratio (lower is better) [0.58] Critical Success Index (higher is better) [0.40]
IEMBot Social Media Posts
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Posts yesterday per supported service:
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