Alert archive / Michigan / Mesoscale Discussions in 2004

Mesoscale Discussion 622

May 9, 20044 counties in Illinois; 7 counties in Indiana; 39 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at May 9, 2004, 5:17 PM CDT for 4 counties in Illinois; 7 counties in Indiana; 39 counties in Michigan. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 9, 2004, 5:17 PM CDT (22:17 UTC)
Expired: May 9, 2004, 6:45 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center

All 50 counties

Cook County, IL, DuPage County, IL, Lake County, IL, Will County, IL, Elkhart County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Porter County, IN, Saint Joseph County, IN, Steuben County, IN, Allegan County, MI, Barry County, MI, Bay County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Mecosta County, MI, Midland County, MI, Monroe County, MI, Montcalm County, MI, Newaygo County, MI, Oakland County, MI, Ottawa County, MI, Saginaw County, MI, Saint Clair County, MI, Saint Joseph County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI

The radar

The Grand Rapids radar (KGRR), 80 km from the middle of the area, began a volume at 22:18 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 175May 9, 6:50 PM CDT

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 10.3 hours before the alert went out and 232 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 834 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 8, 9:55 PM CDT	Mesoscale Discussion	SPC	Boone, Cook, Lake, McHenry, Stephenson, Winnebago	2 hr
May 9, 1:22 AM CDT	Mesoscale Discussion	SPC	Hancock	23 min
May 9, 11:48 AM CDT	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Kane, Lake and 4 more	2 hr
May 9, 12:55 PM CDT	Severe Thunderstorm Watch	SPC	Cook, DuPage, Lake, Will	6 hr
May 9, 2:46 PM CDT	Mesoscale Discussion	SPC	Cook, Lake	89 min
May 9, 4:46 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, Grundy, Henry and 10 more	59 min
May 9, 6:50 PM CDT	Severe Thunderstorm Watch	SPC	Cook, DuPage, Grundy, Kankakee, Kendall, LaSalle and 3 more	4 hr
May 8, 7:16 PM CDT	Mesoscale Discussion	SPC	Elkhart, Kosciusko, LaGrange, Marshall, Noble, Saint Joseph and 1 more	119 min
May 9, 9:35 AM CDT	Mesoscale Discussion	SPC	Steuben	55 min
May 8, 8:46 PM CDT	Mesoscale Discussion	SPC	Clinton, Eaton, Genesee, Gratiot, Ingham, Ionia and 8 more	119 min
May 9, 6:15 PM CDT	Severe Thunderstorm Watch	SPC	Gogebic, Ontonagon	8 hr

Nearby

Mesoscale Discussions in Michigan, 2004 Mesoscale Discussions in Indiana, 2004 Mesoscale Discussions in Illinois, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.