Alert archive / Michigan / Mesoscale Discussions in 2018
Mesoscale Discussion 1242
The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2018, 1:26 PM EDT for 4 counties in Indiana; 15 counties in Michigan; 8 counties in Ohio. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 6, 2018, 1:26 PM EDT (17:26 UTC)
- Expired
- Aug 6, 2018, 4:00 PM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 27 counties
DeKalb County, IN, LaGrange County, IN, Noble County, IN, Steuben County, IN, Branch County, MI, Calhoun County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Joseph County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Ottawa County, OH, Paulding County, OH, Williams County, OH, Wood County, OH
The radar
The Detroit radar (KDTX), 85 km from the middle of the area, began a volume at 17:26 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 nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 5.4 hours before the alert went out and 88 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
- 2085 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 834 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 1:47 PM EDT | Severe Thunderstorm Watch | SPC | DeKalb, LaGrange, Noble, Steuben | 5 hr |
| Aug 6, 4:16 PM EDT | Mesoscale Discussion | SPC | Gibson, Knox, Pike, Posey, Vanderburgh, Warrick | 2 hr |
| Aug 6, 6:21 PM EDT | Mesoscale Discussion | SPC | Benton, Jasper, Lake, LaPorte, Newton, Porter and 2 more | 114 min |
| Aug 6, 3:12 PM EDT | Mesoscale Discussion | SPC | Ashtabula, Cuyahoga, Erie, Geauga, Lake, Lorain | 3 hr |
| Aug 6, 4:44 PM EDT | Mesoscale Discussion | SPC | Allen, Crawford, Defiance, Erie, Fulton, Hancock and 13 more | 61 min |
Nearby
Mesoscale Discussions in Michigan, 2018Mesoscale Discussions in Ohio, 2018Mesoscale Discussions in Indiana, 2018Every mesoscale discussion in 2018
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.