Alert archive / Michigan / Mesoscale Discussions in 2013
Mesoscale Discussion 1786
The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2013, 7:14 PM EDT for 22 counties in Michigan. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Aug 27, 2013, 7:14 PM EDT (23:14 UTC)
- Expired
- Aug 27, 2013, 8:45 PM EDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 22 counties
Barry County, MI, Branch County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Livingston County, MI, Mecosta County, MI, Midland County, MI, Montcalm County, MI, Saginaw County, MI, Saint Joseph County, MI, Shiawassee County, MI, Washtenaw County, MI
The radar
The Grand Rapids radar (KGRR), 56 km from the middle of the area, began a volume at 23:17 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
Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.2 hours before the alert went out and 312 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
- 1691 J/kg
- Mixed-layer CIN
- -101 J/kg
- Mixed-layer LCL
- 599 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 196 m²/s²
- 0-3 km storm-relative helicity
- 190 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 9.3
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 |
|---|---|---|---|---|
| Aug 27, 3:15 PM EDT | Mesoscale Discussion | SPC | Allegan, Barry, Benzie, Branch, Calhoun, Cass and 24 more | 3 hr |
| Aug 27, 4:52 PM EDT | Severe Thunderstorm Watch | SPC | Barry, Bay, Calhoun, Clare, Clinton, Eaton and 24 more | 5 hr |
Nearby
Mesoscale Discussions in Michigan, 2013Every mesoscale discussion in 2013
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.