IEM Daily Bulletin for Apr 1 2026

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daryl herzmann

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Apr 1, 2026, 8:12:12 AM (3 days ago) Apr 1
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Iowa Environmental Mesonet Daily Bulletin for 01 April 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp Repository Message Link
Mar 31 8:25 AM iem,main 📝 Update LDM docs per constant emails
https://mesonet.agron.iastate.edu/request/ldm.php		 Link
Mar 31 8:26 AM iem,main 📝 Sundry updates per review Link
Mar 31 10:00 AM iem,main 🎨 Try additional service stability flags Link
Mar 31 10:57 AM iem,main 🚚 Forklift TC to use gunicorn Link
Mar 31 12:25 PM iem,main ✏️ Continued messing with service configs Link


Daily Feature

53°F Rise
Date: 31 Mar 05:30 AM
Votes: Good: 13   Bad: 0 Abstain: 0

Temperatures soared again on Monday with records highs set at a number of locations across Iowa. The weather station at Spencer (NW Iowa) started off the morning with a low temperature of 33°F and warmed to 86°F, making for a 53°F difference between the daily low and high. The featured chart looks into the largest such calendar day temperature differences for the state. The right hand side cartoons display the temperature time-series for each event to give a feel for how the temperature changed during the day (and often a visual sign of data quality issues, alas). Interestingly, just over a week ago was another such 53°F change on the 21rst. The largest difference of 55°F was associated with a cold front passage as colder air rushed in after an early afternoon high temperature.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 31 Mar 2026 - 12 AM 1 Apr 2026 CDT

Summary By WFO Watches
Type USIA ARXDVNDMXOAXFSD US
Tornado 13 0 0 0 0 0 0 0
Svr Tstorm 137 8 2 15 0 0 0 7
Flash Flood 13 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: 148 Verified:  69 [46.6%]
Polygon Size Versus County Size            [32.3%]
Average Perimeter Ratio                    [32.3%]
Percentage of Warned Area Verified (15km)  [22.8%]
Average Storm Based Warning Size           [1548 sq km]
Probability of Detection(higher is better) [0.83]
False Alarm Ratio (lower is better)        [0.53]
Critical Success Index (higher is better)  [0.43]

IEMBot Social Media Posts

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Posts yesterday per supported service:

  • ATMosphere (bluesky only attm): 2,252
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