Alert archive / Iowa / Mesoscale Discussions in 2026

Mesoscale Discussion 764

May 17, 202611 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at May 17, 2026, 8:18 PM CDT for 11 counties in Iowa. It was in force for 27 min.

The area

The outline as issued.

The facts

Issued: May 17, 2026, 8:18 PM CDT (01:18 UTC)
Expired: May 17, 2026, 8:45 PM CDT
In force: 27 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 213...216

Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Emmet County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Woodbury County, IA

The radar

The Sioux Falls radar (KFSD), 156 km from the middle of the area, began a volume at 01:22 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 7:40 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Calhoun, Carroll and 29 more	65 min
May 17, 7:49 PM CDT	Mesoscale Discussion	SPC	Cerro Gordo, Emmet, Floyd, Franklin, Hancock, Howard and 7 more	56 min
May 17, 8:07 PM CDT	Tornado Watch	SPC	Adair, Adams, Audubon, Black Hawk, Boone, Calhoun and 29 more	5 hr
May 17, 9:30 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Butler, Calhoun and 37 more	90 min
May 17, 10:32 PM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Boone, Bremer, Buchanan, Butler and 14 more	118 min
May 17, 11:10 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Appanoose, Benton, Buchanan, Cedar, Clayton and 13 more	5 hr
May 18, 1:24 AM CDT	Mesoscale Discussion	SPC	Appanoose, Cedar, Davis, Dubuque, Henry, Iowa and 12 more	96 min
May 18, 6:51 AM CDT	Mesoscale Discussion	SPC	Des Moines, Henry, Lee	84 min
May 18, 3:29 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Clarke, Decatur and 12 more	2 hr
May 18, 3:49 PM CDT	Tornado Watch	SPC	Adair, Adams, Appanoose, Cass, Clarke, Davis and 21 more	6 hr
May 18, 5:10 PM CDT	Mesoscale Discussion	SPC	Cherokee, Lyon, Monona, O'Brien, Osceola, Plymouth and 2 more	95 min

Nearby

Mesoscale Discussions in Iowa, 2026 Every mesoscale discussion in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.