IEM Daily Bulletin for Oct 28 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 28 October 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Oct 27 5:44 PM	iem,main	📝 Sundry updates per review	Link
Oct 27 9:47 PM	iem,main	✨ Allow plotting overcast for all hours https://mesonet.agron.iastate.edu/plotting/auto/?q=45	Link

Daily Feature

Daily PIREP Counts
Date: 27 Oct 05:30 AM
Votes: Good: 11   Bad: 1 Abstain: 0

Pilot Reports (PIREP) are generated by aviators as they denote hazardous conditions along their flight paths. This is akin to how you can now make vehicle driving reports via your smart phone of traffic delays, road hazards, or accidents. The IEM collects these PIREP reports and makes a downloadable archive available along with a few analysis tools. The featured chart is one such tool displaying daily counts of total PIREPs over the US and parts of Canada. These reports are partitioned by report type with icing and turbulence being the primary ones. Of interest is the dip in icing reports during the summer months as such conditions are frequent with the troposphere in its warmest state and icing conditions more isolated to convective clouds, which are generally avoided by planes.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 27 Oct 2025 - 12 AM 28 Oct 2025 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	1	0	0	0	0	0	0	0
Svr Tstorm	13	0	0	0	0	0	0	0
Flash Flood	2	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:  14 Verified:   2 [14.3%]
Polygon Size Versus County Size            [31.1%]
Average Perimeter Ratio                    [8.4%]
Percentage of Warned Area Verified (15km)  [5.7%]
Average Storm Based Warning Size           [1769 sq km]
Probability of Detection(higher is better) [1.00]
False Alarm Ratio (lower is better)        [0.86]
Critical Success Index (higher is better)  [0.14]