IEM Daily Bulletin for Apr 9 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 09 April 2026

News

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Daily Feature

Des Moines TAF
Date: 08 Apr 05:30 AM
Votes: Good: 13   Bad: 0 Abstain: 0

The IEM website attempts to produce products and curate archives useful for research at ISU and beyond. One of the seemingly Internet unique archives is of National Weather Service Terminal Aerodome Forecasts (TAF)s. The NWS issues forecasts tailored for the aviation industry for many airports. These forecasts include wind speeds, visibility, and ceilings/cloud cover. The featured infographic attempts to summarize a TAF issued by NWS Des Moines for the Des Moines Airport from Tuesday afternoon into Wednesday afternoon. It shows strong winds and wind shear on Wednesday, but not much cloud concerns with the computed flight condition of VFR shown for most of the day. You can find archives of raw TAF text and processed data for download. There is also a more programatic TAF API service available as well.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 8 Apr 2026 - 12 AM 9 Apr 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	7	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:   1 [14.3%]
Polygon Size Versus County Size            [10.2%]
Average Perimeter Ratio                    [14.0%]
Percentage of Warned Area Verified (15km)  [8.2%]
Average Storm Based Warning Size           [721 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]

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