IEM Daily Bulletin for May 6 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 06 May 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
May 5 11:38 AM	iem,main	📝 Sundry updates per log review	Link
May 5 6:34 PM	pywwa,main	📝 Sundry updates	Link
May 5 10:08 PM	pywwa,main	🎨 Migrate httpx usage back to requests	Link
May 5 10:21 PM	pywwa,main	🚀 Bump min python to 3.11	Link

Daily Feature

May Dew Point by Wind Direction
Date: 05 May 05:30 AM
Votes: Good: 11   Bad: 0 Abstain: 0

A front pushed through the state on Monday and while some portions of southeastern Iowa received rainfall, near surface dry air won out for the majority of the state. The featured chart presents dew point temperature climatology by wind direction based on period of record observations from Des Moines. The statistics are produced by computing vapor pressures first and then back-computing the dew point from those values so to better account for the non-linearity of dew point. The observed values for Monday are plotted as well for comparison. All of the values plotted are below the mean value with a few approaching the 5th percentile.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 5 May 2026 - 12 AM 6 May 2026 CDT

	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:   5 [55.6%]
Polygon Size Versus County Size            [17.7%]
Average Perimeter Ratio                    [27.4%]
Percentage of Warned Area Verified (15km)  [20.5%]
Average Storm Based Warning Size           [1452 sq km]
Probability of Detection(higher is better) [0.33]
False Alarm Ratio (lower is better)        [0.44]
Critical Success Index (higher is better)  [0.26]

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