Alert archive / Georgia / Mesoscale Discussions in 2012
Mesoscale Discussion 2169
The Storm Prediction Center issued this mesoscale discussion at Dec 17, 2012, 10:49 AM CST for Houston County, Alabama; 8 counties in Florida; 37 counties in Georgia. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- Dec 17, 2012, 10:49 AM CST (16:49 UTC)
- Expired
- Dec 17, 2012, 12:45 PM CST
- In force
- 116 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 46 counties
Houston County, AL, Bay County, FL, Calhoun County, FL, Gadsden County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Washington County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Bulloch County, GA, Calhoun County, GA, Candler County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Effingham County, GA, Evans County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Montgomery County, GA, Seminole County, GA, Tattnall County, GA, Telfair County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Turner County, GA, Wheeler County, GA, Wilcox County, GA, Worth County, GA
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 4.8 hours before the alert went out and 105 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
- 4 J/kg
- Mixed-layer CIN
- -279 J/kg
- Mixed-layer LCL
- 587 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 186 m²/s²
- 0-3 km storm-relative helicity
- 390 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Dec 17, 4:16 AM CST | Mesoscale Discussion | SPC | Baldwin, Escambia, Mobile | 119 min |
| Dec 17, 1:24 PM CST | Mesoscale Discussion | SPC | Lauderdale | 2 hr |
| Dec 17, 12:30 PM CST | Tornado Watch | SPC | Baker, Columbia, Franklin, Gadsden, Gulf, Hamilton and 8 more | 5 hr |
| Dec 17, 1:28 PM CST | Mesoscale Discussion | SPC | Effingham, Screven | 92 min |
Nearby
Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in Florida, 2012Mesoscale Discussions in Alabama, 2012Every mesoscale discussion in 2012
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.