Alert archive / Michigan / Mesoscale Discussions in 2015
Mesoscale Discussion 1777
The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2015, 1:07 PM EDT for 22 counties in Michigan. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 8, 2015, 1:07 PM EDT (17:07 UTC)
- Expired
- Sep 8, 2015, 3:30 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 22 counties
Allegan County, MI, Barry County, MI, Bay County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gladwin County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Kalamazoo County, MI, Kent County, MI, Livingston County, MI, Mecosta County, MI, Midland County, MI, Montcalm County, MI, Newaygo County, MI, Saginaw County, MI, Shiawassee County, MI, Van Buren County, MI
The radar
The Grand Rapids radar (KGRR), 54 km from the middle of the area, began a volume at 17:08 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, 5.1 hours before the alert went out and 132 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, 2:29 PM EDT | Mesoscale Discussion | SPC | Berrien, Cass | 91 min |
| Sep 8, 3:59 PM EDT | Mesoscale Discussion | SPC | Alcona, Arenac, Bay, Clinton, Genesee, Gratiot and 20 more | 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.