Iowa Environmental Mesonet Daily Bulletin for 03 November 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp Repository Message Link
Nov 2 8:39 AM iem,main 🎨 Sundry typing fixes along with prod log review Link
Nov 2 9:43 AM iem,main 🐛 Fix xlim for all axes Link
Nov 2 10:43 AM iem,main 🎨 Use CGIModel validation for autoplot backend Link
Nov 2 11:32 AM iem,main 🐛 Address and test autoplot gallery support Link
Nov 2 11:33 AM iem,main 🔥 Remove obsoleted shim Link
Nov 2 1:47 PM iem,main 🚚 Stop NAM use per RRFS replacement Link
Nov 2 1:53 PM iem,main 🔥 Remove NAM MOS references as its dead Link
Nov 2 2:18 PM iem,main 🎨 Address typing issues prior to refactor Link
Nov 2 2:40 PM iem,main 🔥 Remove deprecated paste library usage Link
Nov 2 3:25 PM iem,main 🔥 Cull unused frontend Link
Nov 2 6:37 PM iem,main 🎨 Refactor autoplot internals Link
Nov 2 9:53 PM iem,main 💚 Address codereview Link
Nov 2 10:02 PM iem,main 💚 Add back needed service Link
Nov 2 10:10 PM iem,main 💚 Address missing 0 call Link
Nov 2 10:23 PM iem,main 💚 Address issues found with autoplot 79 Link
Nov 2 10:51 PM iem,main 💚 Improve coverage Link
Nov 2 9:08 AM pywwa,main ⬆️ Update ruff precommit Link
Nov 2 9:08 AM pywwa,main ⬆️ Update ruff python target Link
Nov 2 9:17 AM pywwa,main ✨ Reload station table in DSM parser every 24hrs Link


Daily Feature

November Slide
Date: 02 Nov 05:30 AM
Votes: Good: 15   Bad: 0 Abstain: 0

After only one day with wide spread sub-freezing temperatures during October, November has started off mild as well with the forecast for the first week of month remaining well above freezing for low temperatures. It continues to be remarkable to denote how much warmer low temperatures have been compared with climatology. The featured chart presents a comparison between various daily climatology sources for Ames for November. The tan bars represent simple period of record averages and the three lines show the last three renditions of the official climatology. The "pull" of climatology is obvious with days getting progressively cooler and this "pull" will get harder to fight against if our current mild weather pattern is to continue.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 2 Nov 2026 - 12 AM 3 Nov 2026 CST

Summary By WFO Watches
Type USIA ARXDVNDMXOAXFSD US
Tornado 1 0 0 0 0 0 0 3
Svr Tstorm 61 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:  58 Verified:   8 [13.8%]
Polygon Size Versus County Size            [26.4%]
Average Perimeter Ratio                    [21.1%]
Percentage of Warned Area Verified (15km)  [4.1%]
Average Storm Based Warning Size           [1965 sq km]
Probability of Detection(higher is better) [0.77]
False Alarm Ratio (lower is better)        [0.86]
Critical Success Index (higher is better)  [0.13]

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