IEM Daily Bulletin for Aug 5 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 05 August 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Aug 4 10:22 PM	iem,main	🚚 Update NCEI climdiv URL	Link
Aug 4 10:43 PM	iem,main	✨ Add 1minute precip to ISUSM plot https://mesonet.agron.iastate.edu/agclimate/smts.php?opt=at	Link

Daily Feature

2026 Daily PM2.5 AQI
Date: 04 Aug 05:30 AM
Votes: Good: 17   Bad: 0 Abstain: 0

Agronomy Hall at Iowa State University hosts a PurpleAir air quality sensor. Unfortunately, wild fires and the associated smoke continues to be a problem plaguing much of the country. The featured chart presents the daily range of PM2.5 (2.5 micrometers or less) Air Quality Index (AQI) for 2026. The chart colors represent the ranges of values associated with the given AQI rating. The wild fire smoke has certainly been noticeable over Iowa these past number of weeks. The hazardous levels were reached just over a week ago on 24 July.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 4 Aug 2026 - 12 AM 5 Aug 2026 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	24	1	0	0	0	1	0	1
Flash Flood	25	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:  23 Verified:   3 [13.0%]
Polygon Size Versus County Size            [5.3%]
Average Perimeter Ratio                    [19.1%]
Percentage of Warned Area Verified (15km)  [9.9%]
Average Storm Based Warning Size           [1011 sq km]
Probability of Detection(higher is better) [0.36]
False Alarm Ratio (lower is better)        [0.87]
Critical Success Index (higher is better)  [0.11]

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