IEM Daily Bulletin for Nov 5 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 05 November 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Nov 4 3:30 PM	iem,main	📝 Sundry updates per review	Link
Nov 4 3:44 PM	iem,main	💚 Check for missing value	Link

Daily Feature

Snow Cover Impact by Month
Date: 04 Nov 05:30 AM
Votes: Good: 8   Bad: 1 Abstain: 0

As we creep closer to winter and with some hints of snow in the forecast, it is a good time to check in on a simple analysis of daily high and low temperature monthly distributions for Ames partitioned by the presence of snow cover. There are a few caveats including that while the presence of snow cover and the temperatures are reported on the same date, they are not necessarily sequential. For example, a light morning snow cover could melt and the afternoon high temperature be quite mild. Those issues aside, the partitioned distributions are presented as half-violin plots, which attempt to show the most frequent observations by the width of the curve. A simple mean value is plotted as well. There are certainly some strong signals to be found within the plotted analyses and of course, for high temperature some of the difference is a self-fulfilling prophesy requiring cold temperatures to support snow in the first place. The shape of the low temperature distributions is very interesting as you can see snow supporting much colder low temperatures.

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NWS Watch/Warning Summary for 12 AM 4 Nov 2025 - 12 AM 5 Nov 2025 CST

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	0	0	0	0	0	0	0	0
Svr Tstorm	0	0	0	0	0	0	0	0
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

No SVR+TOR Warnings Issued.