Alert archive / Georgia / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 764

November 11, 200222 counties in Georgia; 12 counties in South Carolina

The Storm Prediction Center issued this severe thunderstorm watch at Nov 11, 2002, 11:05 AM EST for 22 counties in Georgia; 12 counties in South Carolina. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Nov 11, 2002, 11:05 AM EST (16:05 UTC)
Expired: Nov 11, 2002, 5:00 PM EST
In force: 6 hr
Issued by: the Storm Prediction Center

All 34 counties

Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Chatham County, GA, Dodge County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Montgomery County, GA, Richmond County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Wheeler County, GA, Wilcox County, GA, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Georgetown County, SC, Hampton County, SC, Jasper County, SC, Orangeburg County, SC

The radar

The Charleston,SC radar (KCLX), 65 km from the middle of the area, began a volume at 16:07 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Nov 11, 1:21 PM EST	Severe Thunderstorm Warning	CHS	Bulloch, Effingham	39 min
Nov 11, 1:37 PM EST	Severe Thunderstorm Warning	CHS	Bryan	28 min

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 4.1 hours before the alert went out and 166 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: 1057 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 111606
SEL4  
SPC WW 111605
GAZ000-SCZ000-CWZ000-112200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 764
STORM PREDICTION CENTER NORMAN OK
1105 AM EST MON NOV 11 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

EASTERN GEORGIA                            
SOUTHERN SOUTH CAROLINA                     
ADJACENT COASTAL WATERS                     

EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1105 AM UNTIL 500
PM EST.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 100 STATUTE MILES
EAST AND WEST OF A LINE FROM 55 MILES WEST SOUTHWEST OF SAVANNAH
GEORGIA TO 45 MILES NORTH NORTHWEST OF CHARLESTON SOUTH CAROLINA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...  CONTINUE...WW 758...WW 759...WW
760...WW 761...WW 762...

DISCUSSION...OVERNIGHT SQUALL LINE HAS WEAKENED DURING THE MORNING
HOURS...BUT ADDITIONAL STORMS WILL LIKELY FORM ALONG THE OUTFLOW
BOUNDARY AND WITHIN THE UNSTABLE WARM SECTOR THROUGH THIS
AFTERNOON.  LOW-LEVEL SHEAR IS EXPECTED TO GRADUALLY WEAKEN WITH
TIME...BUT MLCAPE VALUES OF 2000-3000 J/KG AND UNIDIRECTIONAL WIND
PROFILES SHOULD STILL BE SUPPORTIVE OF A FEW STORMS WITH DAMAGING
WINDS AND ISOLATED LARGE HAIL.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM MOTION
VECTOR 24035.


...THOMPSON

332,0783 314,0802 314,0834 332,0820

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 10, 8:55 PM EST	Tornado Watch	SPC	Baker, Berrien, Brooks, Calhoun, Clay, Colquitt and 13 more	5 hr
Nov 10, 11:05 PM EST	Tornado Watch	SPC	Banks, Barrow, Bartow, Butts, Carroll, Catoosa and 52 more	6 hr
Nov 11, 3:10 AM EST	Tornado Watch	SPC	Clay, Quitman, Randolph	5 hr
Nov 11, 3:30 AM EST	Tornado Watch	SPC	Baldwin, Banks, Barrow, Bibb, Butts, Carroll and 53 more	6 hr
Nov 11, 5:40 AM EST	Tornado Watch	SPC	Baldwin, Bleckley, Burke, Candler, Columbia, Dodge and 25 more	5 hr
Nov 11, 7:30 AM EST	Tornado Watch	SPC	Baker, Ben Hill, Berrien, Brooks, Calhoun, Clay and 24 more	6 hr
Nov 11, 1:10 AM EST	Tornado Watch	SPC	Cherokee, York	6 hr
Nov 11, 6:35 AM EST	Tornado Watch	SPC	Cherokee	4 hr
Nov 11, 10:00 AM EST	Tornado Watch	SPC	Horry, Marion, Williamsburg	5 hr

Nearby

Severe Thunderstorm Watches in Georgia, 2002 Severe Thunderstorm Watches in South Carolina, 2002 Every severe thunderstorm watch in 2002

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.