Alert archive / Georgia / Tornado Watches in 2006

Tornado Watch 883

December 25, 200610 counties in Georgia; 10 counties in South Carolina

The Storm Prediction Center issued this tornado watch at Dec 25, 2006, 8:47 AM EST for 10 counties in Georgia; 10 counties in South Carolina. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Dec 25, 2006, 8:47 AM EST (13:47 UTC)
Expired: Dec 25, 2006, 2:30 PM EST
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 0.5 in
Strongest gust expected: 60 kt

Counties Bryan County, GA, Bulloch County, GA, Candler County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Tattnall County, GA, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Williamsburg County, SC

The radar

The Charleston,SC radar (KCLX), 35 km from the middle of the area, began a volume at 13:47 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.

What SPC expected

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

Two or more tornadoes: 30%
One or more EF2 to EF5 tornadoes: 10%
Ten or more severe wind reports: 20%
One or more gusts of 65 knots or more: 5%
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: 40%

Discussions around it

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

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 1.8 hours before the alert went out and 113 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 7 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 486 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 346 m²/s²
0-3 km storm-relative helicity: 535 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.

000 
WWUS20 KWNS 251347
SEL3  
SPC WW 251347
GAZ000-SCZ000-CWZ000-252000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 883
NWS STORM PREDICTION CENTER NORMAN OK
845 AM EST MON DEC 25 2006

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

       EASTERN GEORGIA
       SOUTHERN AND EASTERN SOUTH CAROLINA
       COASTAL WATERS

EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 845 AM UNTIL 300
PM EST.

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 45 STATUTE
MILES EAST AND WEST OF A LINE FROM 70 MILES SOUTHWEST OF SAVANNAH
GEORGIA TO 10 MILES WEST NORTHWEST OF MYRTLE BEACH SOUTH
CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 882...

DISCUSSION...NRN PART OF PREFRONTAL SQLN EXTENDING NEWD FROM THE
NERN GULF OF MEXICO WILL CONTINUE MOVING ENE ACROSS THE ERN GA AND
SC CSTL PLN.  AHEAD OF LINE...NWD MOVEMENT OF WARM FRONT HAS ALLOWED
WARM/HUMID AIR TO OVERSPREAD THE SC CSTL PLN.  SUFFICIENT LOW TO MID
LEVEL SHEAR WILL REMAIN PRESENT TO SUPPORT THREAT FOR ISOLATED
TORNADOES AND POSSIBLY DAMAGING WIND WITH EMBEDDED ROTATING STORMS
ALONG SQLN.  FARTHER E...WIDELY SCATTERED STORMS MAY CONTINUE TO
FORM IN WARM ADVECTION ZONE/AREA OF ENHANCED LOW LEVEL SHEAR ALONG
WARM FRONT.  SUSTAINED CELLS IN THIS REGION MAY ALSO POSE A THREAT
FOR ISOLATED TORNADOES.

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
400. MEAN STORM MOTION VECTOR 21040.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 25, 6:16 AM EST	Tornado Watch	SPC	Brantley, Camden, Charlton, Clinch, Echols, Glynn and 3 more	7 hr
Dec 25, 8:00 AM EST	Mesoscale Discussion	SPC	Appling, Bacon, Bryan, Bulloch, Chatham, Effingham and 6 more	90 min
Dec 25, 12:01 PM EST	Mesoscale Discussion	SPC	Brantley, Camden, Charlton, Glynn	59 min
Dec 25, 1:19 PM EST	Mesoscale Discussion	SPC	Bryan, Chatham, Effingham, Liberty	56 min

Nearby

Tornado Watches in Georgia, 2006 Tornado Watches in South Carolina, 2006 Every tornado watch in 2006

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.