Alert archive / Iowa / Mesoscale Discussions in 2018

Mesoscale Discussion 1238

August 5, 20186 counties in Illinois; 19 counties in Iowa; Green County, Lafayette County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 5, 2018, 5:44 PM CDT for 6 counties in Illinois; 19 counties in Iowa; Green County, Lafayette County, Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 5, 2018, 5:44 PM CDT (22:44 UTC)
Expired: Aug 5, 2018, 7:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 27 counties

Benton County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Marion County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Washington County, IA, Carroll County, IL, Jo Daviess County, IL, Ogle County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Green County, WI, Lafayette County, WI

The radar

The Quad Cities radar (KDVN), 91 km from the middle of the area, began a volume at 22:47 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 331Aug 5, 8:00 PM CDT

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
Aug 5, 1:00 AM CDT	Severe Thunderstorm Watch	SPC	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more	4 hr
Aug 5, 3:46 AM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 11 more	89 min
Aug 5, 4:10 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Calhoun, Carroll, Cerro Gordo, Crawford, Emmet and 15 more	3 hr
Aug 5, 3:57 PM CDT	Mesoscale Discussion	SPC	Ashland, Barron, Bayfield, Burnett, Florence, Forest and 11 more	93 min

Nearby

Mesoscale Discussions in Iowa, 2018 Mesoscale Discussions in Illinois, 2018 Mesoscale Discussions in Wisconsin, 2018 Every mesoscale discussion in 2018

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.