Alert archive / Michigan / Mesoscale Discussions in 2015
Mesoscale Discussion 1780
The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2015, 3:59 PM EDT for 26 counties in Michigan. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Sep 8, 2015, 3:59 PM EDT (19:59 UTC)
- Expired
- Sep 8, 2015, 5:30 PM EDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 26 counties
Alcona County, MI, Arenac County, MI, Bay County, MI, Clinton County, MI, Genesee County, MI, Gratiot County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Iosco County, MI, Jackson County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Midland County, MI, Monroe County, MI, Oakland County, MI, Ogemaw County, MI, Saginaw County, MI, Saint Clair County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI
The radar
The Detroit radar (KDTX), 60 km from the middle of the area, began a volume at 19:59 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 nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 8.0 hours before the alert went out and 57 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
- 402 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 920 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- -44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
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 |
|---|---|---|---|---|
| Sep 8, 1:07 PM EDT | Mesoscale Discussion | SPC | Allegan, Barry, Bay, Calhoun, Clinton, Eaton and 16 more | 2 hr |
| Sep 8, 2:29 PM EDT | Mesoscale Discussion | SPC | Berrien, Cass | 91 min |
Nearby
Mesoscale Discussions in Michigan, 2015Every mesoscale discussion in 2015
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.