Alert archive / Georgia / Mesoscale Discussions in 2012
Mesoscale Discussion 2195
The Storm Prediction Center issued this mesoscale discussion at Dec 20, 2012, 1:31 PM CST for 7 counties in Alabama; 13 counties in Florida; 19 counties in Georgia. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Dec 20, 2012, 1:31 PM CST (19:31 UTC)
- Expired
- Dec 20, 2012, 2:30 PM CST
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 39 counties
Barbour County, AL, Coffee County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Pike County, AL, Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Worth County, GA
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.5 hours before the alert went out and 125 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2063 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 200 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
803 ACUS11 KWNS 201931 SWOMCD SPC MCD 201931 GAZ000-FLZ000-ALZ000-202030- MESOSCALE DISCUSSION 2195 NWS STORM PREDICTION CENTER NORMAN OK 0131 PM CST THU DEC 20 2012 AREAS AFFECTED...FL PANHANDLE...SERN AL...SWRN GA CONCERNING...TORNADO WATCH 690... VALID 201931Z - 202030Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 690 CONTINUES. SUMMARY...CONVECTION HAS GRADUALLY WEAKENED ACROSS MUCH OF NRN/CNTRL PORTIONS OF TORNADO WATCH. SEVERE THREAT APPEARS TO BE FOCUSING NEAR THE COAST. DISCUSSION...MAJORITY OF UPDRAFTS WITHIN CONVECTIVE CORRIDOR THAT EXTENDS INLAND FROM THE NRN FL PANHANDLE INTO CNTRL GA APPEAR TO BE GRADUALLY WEAKENING. LIGHTNING OVER LAND HAS ALL BUT DISSIPATED THOUGH PRE-FRONTAL SQUALL LINE REMAINS FAIRLY ORGANIZED AS IT PROGRESSES INTO WCNTRL GA. MORE BUOYANT AIRMASS CURRENTLY RESIDES OVER THE NERN GOM AND 18Z SOUNDING FROM TLH EXHIBITS MEAGER INSTABILITY AND POOR LAPSE RATES. FOR THIS REASON IT APPEARS THE GREATEST SEVERE RISK WILL BE NOTED WITH NEAR COASTAL SUPERCELL STRUCTURES THAT MOVE OFF THE WARMER WATERS BEFORE WEAKENING. WITH TIME ADDITIONAL WEAK DESTABILIZATION IS EXPECTED AHEAD OF CLOUD CANOPY OVER NERN FL. LOW LEVEL LAPSE RATES ARE SLOWLY STEEPENING BUT UNTIL BOUNDARY LAYER MOISTURE INCREASES ACROSS THIS REGION THE PROSPECT FOR ROBUST ORGANIZED SEVERE UPDRAFTS WILL BE DELAYED. ..DARROW.. 12/20/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FFC...TAE...BMX...MOB... LAT...LON 31878598 31888326 29618462 29598730 31878598
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 20, 4:08 AM CST | Mesoscale Discussion | SPC | Choctaw, Colbert, Fayette, Franklin, Greene, Lamar and 5 more | 67 min |
| Dec 20, 4:23 AM CST | Tornado Watch | SPC | Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 34 more | 9 hr |
| Dec 20, 7:09 AM CST | Mesoscale Discussion | SPC | Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 22 more | 96 min |
| Dec 20, 8:49 AM CST | Mesoscale Discussion | SPC | Dale, Geneva, Henry, Houston | 56 min |
| Dec 20, 9:19 AM CST | Tornado Watch | SPC | Coffee, Dale, Geneva, Henry, Houston | 9 hr |
| Dec 20, 9:56 AM CST | Mesoscale Discussion | SPC | Autauga, Baldwin, Bibb, Butler, Chambers, Chilton and 22 more | 64 min |
| Dec 20, 5:22 PM CST | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 7 more | 53 min |
| Dec 20, 11:24 AM CST | Mesoscale Discussion | SPC | Baldwin, Bibb, Bleckley, Butts, Chattahoochee, Coweta and 36 more | 66 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.