Alert archive / Michigan / Mesoscale Discussions in 2004
Mesoscale Discussion 408
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2004, 1:16 PM EST for 19 counties in Indiana; 20 counties in Michigan; 11 counties in Ohio. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2004, 1:16 PM EST (18:16 UTC)
- Expired
- Apr 21, 2004, 3:45 PM EST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 50 counties
Adams County, IN, Allen County, IN, Blackford County, IN, DeKalb County, IN, Delaware County, IN, Grant County, IN, Hamilton County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Madison County, IN, Miami County, IN, Noble County, IN, Randolph County, IN, Steuben County, IN, Tipton County, IN, Wabash County, IN, Wells County, IN, Whitley County, IN, Bay County, MI, Branch County, MI, Clinton County, MI, Genesee County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saginaw County, MI, Saint Clair County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Mercer County, OH, Paulding County, OH, Putnam County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 6.3 hours before the alert went out and 92 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.
- Mixed-layer CAPE
- 4 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 998 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 235 m²/s²
- 0-3 km storm-relative helicity
- 260 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 8:55 PM EST | Mesoscale Discussion | SPC | Adams, Allen, Cass, DeKalb, Elkhart, Fulton and 19 more | 65 min |
| Apr 21, 2:58 PM EST | Mesoscale Discussion | SPC | Gibson, Posey | 92 min |
| Apr 21, 11:48 AM EST | Mesoscale Discussion | SPC | Ashland, Ashtabula, Carroll, Columbiana, Coshocton, Geauga and 13 more | 2 hr |
Nearby
Mesoscale Discussions in Michigan, 2004Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Ohio, 2004Every 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.