IEM Daily Bulletin for Nov 8 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 08 November 2025

News

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Daily Feature

November Measurable Snowfall
Date: 07 Nov 05:30 AM
Votes: Good: 10   Bad: 0 Abstain: 0

The weather forecast for this weekend brings the coldest temperatures of the season to date along with a decent chance of measurable snowfall on Saturday. The calendar says November and such an event is certainly not out of the ordinary. The featured map plots the percentage of years over each long term climate station's period of record that at least one measurable snowfall event during the month of November. This type of map tends to be a bit noisy due to varying periods of record, difficulties with snowfall measurements, and snow data quality issues. The general north to south pattern is informative with about a 50% chance over southern Iowa and increasing to near 90% over far northern Iowa. The difficulty getting measurable snow tends to be soil temperatures that are still relatively warm and will melt the snow before it can accumulate. For Saturday's event, air temperatures will be hovering near freezing as well, so some parts of the state may only see a chilly rain and no snow.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 7 Nov 2025 - 12 AM 8 Nov 2025 CST

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	0	0	0	0	0	0	0	1
Svr Tstorm	9	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

SVR+TOR Warnings Issued:   9 Verified:   3 [33.3%]
Polygon Size Versus County Size            [35.5%]
Average Perimeter Ratio                    [35.8%]
Percentage of Warned Area Verified (15km)  [17.4%]
Average Storm Based Warning Size           [1518 sq km]
Probability of Detection(higher is better) [0.58]
False Alarm Ratio (lower is better)        [0.67]
Critical Success Index (higher is better)  [0.27]