Alert archive / Michigan / Mesoscale Discussions in 2004

Mesoscale Discussion 794

May 21, 20045 states

The Storm Prediction Center issued this mesoscale discussion at May 21, 2004, 9:40 AM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 21, 2004, 9:40 AM CDT (14:40 UTC)
Expired: May 21, 2004, 11:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 96 counties

Cook County, IL, DuPage County, IL, Kane County, IL, Kankakee County, IL, Lake County, IL, Will County, IL, Allen County, IN, DeKalb County, IN, Elkhart County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Noble County, IN, Porter County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Whitley County, IN, Allegan County, MI, Antrim County, MI, Arenac County, MI, Barry County, MI, Bay County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clare County, MI, Clinton County, MI, Crawford County, MI, Eaton County, MI, Genesee County, MI, Gladwin County, MI, Grand Traverse County, MI, Gratiot County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kalkaska County, MI, Kent County, MI, Lake County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Mason County, MI, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Monroe County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oakland County, MI, Oceana County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Otsego County, MI, Ottawa County, MI, Roscommon County, MI, Saginaw County, MI, Saint Clair County, MI, Saint Joseph County, MI, Shiawassee County, MI, Tuscola County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Wexford County, MI, Allen County, OH, Crawford County, OH, Cuyahoga County, OH, Defiance County, OH, Erie County, OH, Fulton County, OH, Hancock County, OH, Henry County, OH, Huron County, OH, Lorain County, OH, Lucas County, OH, Ottawa County, OH, Paulding County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH, Kenosha County, WI

The radar

The Northern Indiana radar (KIWX), 88 km from the middle of the area, began a volume at 14:41 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.

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
May 20, 7:32 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 21 more	88 min
May 20, 9:05 PM CDT	Severe Thunderstorm Watch	SPC	Bureau, Cook, DeKalb, DuPage, Ford, Fulton and 20 more	5 hr
May 21, 4:34 AM CDT	Mesoscale Discussion	SPC	Jo Daviess	56 min
May 21, 10:25 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 8 more	6 hr
May 21, 2:45 PM CDT	Tornado Watch	SPC	Rock Island	7 hr
May 21, 5:35 PM CDT	Tornado Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 21 more	5 hr
May 21, 12:05 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Blackford, DeKalb, Grant, Huntington and 7 more	4 hr
May 21, 1:19 PM CDT	Mesoscale Discussion	SPC	Allen, DeKalb, Fulton, Kosciusko, Marshall, Noble and 2 more	116 min
May 21, 10:55 AM CDT	Severe Thunderstorm Watch	SPC	Barry, Bay, Calhoun, Clinton, Eaton, Genesee and 21 more	5 hr
May 21, 1:40 AM CDT	Mesoscale Discussion	SPC	Ashland, Carroll, Columbiana, Coshocton, Crawford, Cuyahoga and 20 more	65 min
May 21, 3:45 AM CDT	Mesoscale Discussion	SPC	Belmont, Carroll, Columbiana, Coshocton, Fairfield, Franklin and 12 more	60 min
May 21, 2:15 PM CDT	Severe Thunderstorm Watch	SPC	Ashtabula, Belmont, Carroll, Columbiana, Cuyahoga, Geauga and 10 more	6 hr
May 21, 3:25 PM CDT	Severe Thunderstorm Watch	SPC	Athens, Auglaize, Champaign, Clark, Clinton, Darke and 21 more	6 hr
May 21, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	Gallia, Meigs	4 hr
May 21, 9:44 AM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Crawford, Eau Claire, Grant, Jackson and 9 more	3 hr
May 21, 1:59 PM CDT	Mesoscale Discussion	SPC	Adams, Columbia, Crawford, Dane, Dodge, Fond du Lac and 10 more	2 hr
May 21, 3:00 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Calumet, Columbia, Dane, Dodge, Fond du Lac and 19 more	7 hr

Nearby

Mesoscale Discussions in Michigan, 2004 Mesoscale Discussions in Ohio, 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.