Alert archive / Georgia / Tornado Watches in 2012

Tornado Watch 698

December 25, 201218 counties in Alabama; 15 counties in Florida; 29 counties in Georgia

The Storm Prediction Center issued this tornado watch at Dec 25, 2012, 9:23 PM CST for 18 counties in Alabama; 15 counties in Florida; 29 counties in Georgia. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Dec 25, 2012, 9:23 PM CST (03:23 UTC)
Expired
Dec 26, 2012, 3:21 AM CST
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
60 kt
All 62 counties

Baldwin County, AL, Barbour County, AL, Bullock County, AL, Chambers County, AL, Coffee County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Russell County, AL, Tallapoosa County, AL, Bay County, FL, Calhoun County, FL, Escambia 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, Santa Rosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Harris County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Miller County, GA, Mitchell County, GA, Muscogee County, GA, Pike County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Troup County, GA, Upson County, GA, Webster County, GA

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
40%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
5%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Dec 25, 9:29 PM CSTSevere Thunderstorm WarningMOBConecuh, Covington, Escambia46 min
Dec 25, 9:35 PM CSTSevere Thunderstorm WarningMOBButler, Conecuh, Covington, Crenshaw70 min
Dec 25, 9:45 PM CSTSevere Thunderstorm WarningMOBBaldwin, Covington, Escambia45 min
Dec 25, 9:51 PM CSTSevere Thunderstorm WarningBMXMontgomery39 min
Dec 25, 10:12 PM CSTSevere Thunderstorm WarningTAECoffee63 min
Dec 25, 10:15 PM CSTSevere Thunderstorm WarningMOBCovington, Crenshaw60 min
Dec 25, 10:18 PM CSTTornado WarningBMXPike42 min
Dec 25, 10:22 PM CSTSevere Thunderstorm WarningBMXBullock38 min
Dec 25, 10:29 PM CSTSevere Thunderstorm WarningMOBCovington, Escambia46 min
Dec 25, 10:40 PM CSTTornado WarningMOBCovington35 min
Dec 25, 10:45 PM CSTSevere Thunderstorm WarningBMXMacon45 min
Dec 25, 10:48 PM CSTSevere Thunderstorm WarningBMXBullock, Pike42 min
Dec 25, 10:54 PM CSTSevere Thunderstorm WarningTAEWalton66 min
Dec 25, 10:56 PM CSTSevere Thunderstorm WarningTAECoffee, Geneva49 min
Dec 25, 11:13 PM CSTSevere Thunderstorm WarningTAECoffee, Dale32 min
Dec 25, 11:14 PM CSTSevere Thunderstorm WarningMOBCovington26 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 3.4 hours before the alert went out and 177 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.

Skew-T log-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 00:00Z on 2012-12-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 2012-12-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 232 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1109 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
232 m²/s²
0-3 km storm-relative helicity
410 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

292 
WWUS20 KWNS 260322
SEL8
SPC WW 260322
ALZ000-FLZ000-GAZ000-CWZ000-261000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 698
NWS STORM PREDICTION CENTER NORMAN OK
925 PM CST TUE DEC 25 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       SOUTHERN AND SOUTHEAST ALABAMA
       FLORIDA PANHANDLE
       SOUTHWEST GEORGIA
       COASTAL WATERS

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 925 PM
UNTIL 400 AM CST.

TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH NORTHEAST OF
COLUMBUS GEORGIA TO 40 MILES SOUTH SOUTHWEST OF PANAMA CITY
FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...CONTINUE...WW 696...

DISCUSSION...A LINE OF INTENSE STORMS...INCLUDING EMBEDDED
SUPERCELLS...IS TRACKING EASTWARD ACROSS CENTRAL AL.  THESE STORMS
WILL REMAIN IN AN ENVIRONMENT OF STRONG LOW LEVEL VERTICAL SHEAR AND
SUFFICIENT INSTABILITY TO POSE A RISK OF DAMAGING WINDS AND ISOLATED
TORNADOES FOR SEVERAL MORE HOURS AS THEY TRACK INTO WESTERN GA.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 25040.


...HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 25, 6:05 PM CSTMesoscale DiscussionSPCBibb, Chambers, Chilton, Clay, Coosa, Elmore and 5 more85 min
Dec 25, 7:08 PM CSTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Clarke, Clay and 14 more67 min
Dec 25, 8:49 PM CSTMesoscale DiscussionSPCBarbour, Bullock, Coffee, Covington, Crenshaw, Dale and 9 more56 min
Dec 25, 11:10 PM CSTMesoscale DiscussionSPCBarbour, Dale, Geneva, Henry, Houston, Lee and 1 more95 min
Dec 26, 2:55 AM CSTMesoscale DiscussionSPCCalhoun, Gadsden, Gulf, Liberty65 min

Nearby

Tornado Watches in Georgia, 2012Tornado Watches in Alabama, 2012Tornado Watches in Florida, 2012Every tornado watch 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.