Alert archive / Michigan / Mesoscale Discussions in 2013
Mesoscale Discussion 1648
The Storm Prediction Center issued this mesoscale discussion at Aug 7, 2013, 2:12 AM EDT for 22 counties in Michigan. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Aug 7, 2013, 2:12 AM EDT (06:12 UTC)
- Expired
- Aug 7, 2013, 3:15 AM EDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 22 counties
Antrim County, MI, Benzie County, MI, Clare County, MI, Crawford County, MI, Grand Traverse County, MI, Gratiot County, MI, Isabella County, MI, Kalkaska County, MI, Kent County, MI, Lake County, MI, Manistee County, MI, Mason County, MI, Mecosta County, MI, Missaukee County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Osceola County, MI, Ottawa County, MI, Roscommon County, MI, Wexford County, MI
The radar
The Grand Rapids radar (KGRR), 115 km from the middle of the area, began a volume at 06:14 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
Green Bay/Straub, WI (KGRB), launched 00:00Z, 6.2 hours before the alert went out and 197 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
- 424 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1453 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.4
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 7, 2:29 AM EDT | Severe Thunderstorm Watch | SPC | Alcona, Alpena, Antrim, Arenac, Bay, Benzie and 30 more | 5 hr |
| Aug 7, 6:37 AM EDT | Mesoscale Discussion | SPC | Allegan, Barry, Berrien, Branch, Calhoun, Cass and 27 more | 113 min |
| Aug 7, 8:52 AM EDT | Mesoscale Discussion | SPC | Berrien, Branch, Calhoun, Cass, Hillsdale, Jackson and 7 more | 113 min |
| Aug 7, 2:46 PM EDT | Mesoscale Discussion | SPC | Berrien, Branch, Calhoun, Hillsdale, Jackson, Saint Joseph | 119 min |
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.