IEM Daily Bulletin for Oct 16 2025

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 16 October 2025

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Oct 15 8:48 AM	iem,main	✨ Allow base temp control on CDD/HDD https://mesonet.agron.iastate.edu/plotting/auto/?q=116	Link
Oct 15 8:49 AM	iem,main	✨ Add accum CDD/GDD/HDD option https://mesonet.agron.iastate.edu/plotting/auto/?q=172	Link

Daily Feature

Recent Cloudiness and Visibility
Date: 15 Oct 05:30 AM
Votes: Good: 14   Bad: 0 Abstain: 0

Tuesday was a dreary day for most of Iowa with drizzle and occasional rain showers. The featured chart presents a time series this month of hourly cloudiness and near surface horizontal visibility reports from the Des Moines airport weather station. The top panel attempts to illustrate cloudiness by shading reported cloud level and amount reports by extending those values vertically away from the surface. For ASOS, once an overcast condition is reported, there are no subsequent cloudiness reports above that level. The bottom panel is more straight forward with the horizontal visibility reports shaded by the reported distance value. So the lowest cloud decks this month occurred back on the 6th, with the 10th joining yesterday for second lowest for the month.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 15 Oct 2025 - 12 AM 16 Oct 2025 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	0	0	0	0	0	0	0	0
Svr Tstorm	8	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:   7 Verified:   0 [0.0%]
Polygon Size Versus County Size            [9.9%]
Average Perimeter Ratio                    [2.8%]
Percentage of Warned Area Verified (15km)  [0.0%]
Average Storm Based Warning Size           [1917 sq km]
Probability of Detection(higher is better) [0.00]
False Alarm Ratio (lower is better)        [1.00]
Critical Success Index (higher is better)  [0.00]