Alert archive / Georgia / Tornado Watches in 2004

Tornado Watch 831

September 16, 200430 counties in Georgia; 7 counties in North Carolina; 25 counties in South Carolina

The Storm Prediction Center issued this tornado watch at Sep 16, 2004, 8:45 PM EDT for 30 counties in Georgia; 7 counties in North Carolina; 25 counties in South Carolina. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Sep 16, 2004, 8:45 PM EDT (00:45 UTC)
Expired
Sep 17, 2004, 3:00 AM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 62 counties

Baldwin County, GA, Banks County, GA, Burke County, GA, Clarke County, GA, Columbia County, GA, Elbert County, GA, Franklin County, GA, Glascock County, GA, Greene County, GA, Habersham County, GA, Hancock County, GA, Hart County, GA, Jackson County, GA, Jefferson County, GA, Jones County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Morgan County, GA, Oconee County, GA, Oglethorpe County, GA, Putnam County, GA, Rabun County, GA, Richmond County, GA, Stephens County, GA, Taliaferro County, GA, Warren County, GA, Washington County, GA, Wilkes County, GA, Wilkinson County, GA, Cabarrus County, NC, Cleveland County, NC, Gaston County, NC, Lincoln County, NC, Mecklenburg County, NC, Polk County, NC, Union County, NC, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Barnwell County, SC, Calhoun County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Orangeburg County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 60 km from the middle of the area, began a volume at 00:49 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.

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 00:00Z, 0.8 hours before the alert went out and 268 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, Charleston AFB, SC at 00:00Z on 2004-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2699 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 00:00Z on 2004-09-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.193958Sfc1 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
2699 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
481 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.7
Supercell composite
5.1

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 170049
SEL1  
SPC WW 170045
GAZ000-NCZ000-SCZ000-170700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 831
NWS STORM PREDICTION CENTER NORMAN OK
845 PM EDT THU SEP 16 2004

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

       EAST CENTRAL AND NORTHEAST GEORGIA
       A SMALL PART OF SOUTHWEST NORTH CAROLINA
       CENTRAL AND UPSTATE SOUTH CAROLINA

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 845 PM UNTIL
300 AM EDT.

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 ALONG AND 80 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 15 MILES WEST SOUTHWEST OF ATHENS GEORGIA TO
55 MILES NORTHEAST OF COLUMBIA SOUTH CAROLINA.

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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 828...TORNADO WATCH NUMBER 830. WATCH NUMBER 828 830
WILL NOT BE IN EFFECT AFTER 845 PM EDT. 

DISCUSSION...THE REMNANTS OF IVAN ARE MOVING ENEWD FROM AL INTO N
GA...WHILE THE MAIN CONVECTIVE BAND IS LOCATED NEAR THE SAVANNAH
RIVER...WELL E OF THE CIRCULATION CENTER.  BOUNDARY LAYER DEWPOINTS
IN THE LOW-MID 70S WILL SUPPORT AT LEAST WEAK BUOYANCY
OVERNIGHT...WHILE VERTICAL SHEAR WILL REMAIN VERY STRONG FROM ERN GA
ACROSS SC.  PRESENT INDICATIONS ARE THAT THE TORNADO THREAT WILL BE
PRIMARILY IN THE CORRIDOR WHERE THE MAIN CONVECTIVE BAND /OR ANY
ISOLATED STORMS E OF THIS BAND/ INTERACTS WITH A WEAK BAROCLINIC
ZONE ACROSS SC.

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 500.
MEAN STORM MOTION VECTOR 18040.


...THOMPSON

350,0833 353,0802 332,0802 324,0833

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 16, 11:42 PM EDTMesoscale DiscussionSPCBaldwin, Brantley, Burke, Charlton, Clarke, Clinch and 29 more2 hr
Sep 17, 1:51 AM EDTMesoscale DiscussionSPCAlexander, Burke, Caldwell, Catawba, Cleveland, Gaston and 6 more84 min
Sep 17, 9:26 AM EDTMesoscale DiscussionSPCAlamance, Anson, Bladen, Caswell, Chatham, Cumberland and 24 more2 hr
Sep 17, 10:10 AM EDTTornado WatchSPCAlamance, Anson, Bladen, Brunswick, Caswell, Chatham and 37 more7 hr
Sep 17, 11:03 AM EDTMesoscale DiscussionSPCAlamance, Bertie, Caswell, Chatham, Cumberland, Durham and 26 more87 min
Sep 17, 12:33 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Camden, Chowan, Craven, Gates and 8 more117 min
Sep 17, 1:15 PM EDTTornado WatchSPCBeaufort, Bertie, Camden, Carteret, Chowan, Craven and 18 more7 hr
Sep 17, 1:37 PM EDTMesoscale DiscussionSPCAlamance, Bladen, Brunswick, Caswell, Chatham, Columbus and 29 more113 min
Sep 17, 3:53 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Camden, Chowan, Craven, Edgecombe and 11 more2 hr
Sep 17, 4:01 PM EDTMesoscale DiscussionSPCBladen, Brunswick, Columbus, Cumberland, Duplin, Franklin and 6 more59 min
Sep 17, 4:35 PM EDTTornado WatchSPCBladen, Brunswick, Columbus, Duplin, Edgecombe, Franklin and 14 more3 hr
Sep 17, 6:19 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Camden, Chowan, Craven, Currituck and 13 more116 min
Sep 17, 6:50 PM EDTTornado WatchSPCBertie, Camden, Chowan, Currituck, Gates, Hertford and 3 more5 hr
Sep 17, 7:23 PM EDTMesoscale DiscussionSPCDuplin, Edgecombe, Greene, Halifax, Lenoir, Nash and 4 more37 min

Nearby

Tornado Watches in Georgia, 2004Tornado Watches in South Carolina, 2004Tornado Watches in North Carolina, 2004Every tornado watch in 2004

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.