Alert archive / Illinois / Mesoscale Discussions in 2009

Mesoscale Discussion 1664

July 24, 200922 counties in Illinois; 18 counties in Iowa; Grant County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2009, 7:20 PM CDT for 22 counties in Illinois; 18 counties in Iowa; Grant County, Wisconsin. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jul 24, 2009, 7:20 PM CDT (00:20 UTC)
Expired: Jul 24, 2009, 8:45 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

All 41 counties

Allamakee County, IA, Benton County, IA, Buchanan County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, DeKalb County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Grant County, WI

The radar

The Quad Cities radar (KDVN), 50 km from the middle of the area, began a volume at 00:20 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 620Jul 24, 9:50 PM CDT

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 24, 9:22 PM CDT	Mesoscale Discussion	SPC	Bureau, DeWitt, Fulton, Hancock, Henderson, Henry and 18 more	53 min
Jul 24, 9:51 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Cass, DeWitt, Fulton, Hancock and 18 more	4 hr
Jul 24, 11:00 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Coles, Douglas, Edgar, Iroquois and 6 more	3 hr
Jul 24, 11:46 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Champaign, Christian, Clark and 26 more	89 min
Jul 25, 1:26 AM CDT	Severe Thunderstorm Watch	SPC	Bond, Clark, Clay, Clinton, Crawford, Cumberland and 16 more	4 hr
Jul 25, 3:09 AM CDT	Mesoscale Discussion	SPC	Edwards, Franklin, Gallatin, Hamilton, Hardin, Johnson and 8 more	96 min

Nearby

Mesoscale Discussions in Illinois, 2009 Mesoscale Discussions in Iowa, 2009 Mesoscale Discussions in Wisconsin, 2009 Every mesoscale discussion in 2009

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.