Iowa Environmental Mesonet Daily Bulletin for 30 October 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp Repository Message Link
Oct 29 10:26 AM iem,main ✏️ Correct robots.txt Link
Oct 29 1:34 PM iem,main 📝 Sundry updates per log review Link
Oct 29 11:14 PM iem,main 🎨 Address some typing issues found with ty Link
Oct 29 11:29 PM iem,main 🚀 Raise min python to 3.11 Link
Oct 29 11:33 PM iem,main 🎨 Apply ruff formatting Link
Oct 30 5:40 AM iem,main 💚 Address codereview Link
Oct 30 5:51 AM iem,main 💚 Address lint/codereview Link
Oct 29 2:07 PM pyiem,main 🎨 Reduce some more log noise Link
Oct 29 4:37 PM pyiem,main ✨ Add opt-in cache_control option to iemapp
Sends Cache-Control: public, max-age=N on 200 responses, including
memcache hits. A callable can decide per request after schema parsing.
Help, OPTIONS, 429 and error replies get no header, and a header the
application sets itself is kept.
Co-Authored-By: Claude Opus 5.5
Link
Oct 29 10:17 PM pyiem,main 🩹 Workaround iemapp datetime ugliness
Will cleanup with a full refactor someday...
Link
Oct 29 10:26 PM pyiem,main Fix to catch the validation error that could happen
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Link
Oct 29 10:57 PM pyiem,main 🐛 Use werkzeug.test for racy test Link


Daily Feature

Lowest Record to Beat
Date: 29 Oct 05:30 AM
Votes: Good: 20   Bad: 0 Abstain: 0

Waterloo tied a record high from 1927 of 78°F for 28 October. The featured chart looks into the daily high and low temperature climatology during October for Waterloo. The combined shaded region represents the range between the daily record low and high temperature. The green area denotes the range between the daily average low and high temperature. The brown bars are 2026 values with the yellow outlined dot denoting tied or newly set records for 2026. Interesting, the 28 October record high is the only one for the month still below 80°F, so it was the lowest record to beat for the month. Even with it only being 78°F, the record stood untied for 99 years!

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 29 Oct 2026 - 12 AM 30 Oct 2026 CDT

Summary By WFO Watches
Type USIA ARXDVNDMXOAXFSD US
Tornado 1 0 0 0 0 0 0 0
Svr Tstorm 7 0 0 0 0 0 0 0
Flash Flood 22 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:   8 Verified:   2 [25.0%]
Polygon Size Versus County Size            [11.2%]
Average Perimeter Ratio                    [30.3%]
Percentage of Warned Area Verified (15km)  [19.6%]
Average Storm Based Warning Size           [784 sq km]
Probability of Detection(higher is better) [0.57]
False Alarm Ratio (lower is better)        [0.75]
Critical Success Index (higher is better)  [0.21]

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