Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 1751

July 21, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2004, 1:01 PM CDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jul 21, 2004, 1:01 PM CDT (18:01 UTC)
Expired: Jul 21, 2004, 2:30 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 74 counties

Appanoose County, IA, Benton County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Cass County, IN, Fulton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, White County, IN, Berrien County, MI, Van Buren County, MI

The radar

The Quad Cities radar (KDVN), 40 km from the middle of the area, began a volume at 18:04 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 663Jul 21, 2:35 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 21, 7:53 AM CDT	Mesoscale Discussion	SPC	Boone, DuPage, Kane, Lake, McHenry, Stephenson and 1 more	2 hr
Jul 21, 9:03 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Champaign, Cook, DeKalb and 37 more	117 min
Jul 21, 9:35 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 26 more	5 hr
Jul 21, 10:18 AM CDT	Mesoscale Discussion	SPC	Bureau, Cook, DeKalb, DuPage, Ford, Grundy and 14 more	87 min
Jul 21, 2:35 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Cook, DeKalb, DeWitt, DuPage and 20 more	6 hr
Jul 21, 5:09 PM CDT	Mesoscale Discussion	SPC	Bureau, DeWitt, Ford, Grundy, Iroquois, Kankakee and 13 more	36 min
Jul 21, 6:20 PM CDT	Mesoscale Discussion	SPC	Clark, Coles, Edgar, Vermilion	25 min
Jul 21, 6:35 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 30 more	5 hr
Jul 20, 11:08 PM CDT	Mesoscale Discussion	SPC	Howard, Mitchell, Winnebago, Worth	97 min
Jul 21, 3:43 PM CDT	Mesoscale Discussion	SPC	Cherokee, Clay, Dickinson, Lyon, O'Brien, Osceola and 2 more	92 min
Jul 21, 6:02 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Crawford, Dickinson, Emmet and 9 more	118 min
Jul 21, 11:10 AM CDT	Mesoscale Discussion	SPC	Alpena, Antrim, Arenac, Bay, Benzie, Cheboygan and 24 more	2 hr

Nearby

Mesoscale Discussions in Illinois, 2004 Mesoscale Discussions in Iowa, 2004 Mesoscale Discussions in Indiana, 2004 Every mesoscale discussion in 2004

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.