IEM Daily Bulletin for Sep 6 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 06 September 2026

News

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Title: 5 Sep NWS Data Outage
Date: 05 Sep 02:03 PM
Author: Daryl Herzmann
link

NWS data flow mostly stopped around 1 PM this fine Saturday, 5 September. Have yet to here of what happened or when it will be fixed, so will update this news item once more is known!

Update 2:30 PM: Outage continues and no details yet on what is happening.

Update 2:50 PM: Data is flowing again, but still no details on what happened. I am very worried that a bunch of data will never get disseminated. Will update this news item once more is known!

Update 5:00 PM: The data flow has stabilized, but there is a mountain of missed data during the outage. Unfortunately, there is no means to repair the hole as the data appeared to be going nowhere.

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NWS Watch/Warning Summary for 12 AM 5 Sep 2026 - 12 AM 6 Sep 2026 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	172	1	0	0	0	0	7	5
Flash Flood	14	0	0	0	0	0	1	---

ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD

IEM Cow Report

SVR+TOR Warnings Issued: 172 Verified: 100 [58.1%]
Polygon Size Versus County Size            [29.9%]
Average Perimeter Ratio                    [29.7%]
Percentage of Warned Area Verified (15km)  [33.4%]
Average Storm Based Warning Size           [1380 sq km]
Probability of Detection(higher is better) [0.67]
False Alarm Ratio (lower is better)        [0.42]
Critical Success Index (higher is better)  [0.45]

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