Alert archive / Georgia / Tornado Watches in 2003

Tornado Watch 412

May 18, 200323 counties in Georgia; 5 counties in South Carolina

The Storm Prediction Center issued this tornado watch at May 18, 2003, 1:10 PM EDT for 23 counties in Georgia; 5 counties in South Carolina. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 18, 2003, 1:10 PM EDT (17:10 UTC)
Expired
May 18, 2003, 7:00 PM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 28 counties

Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Chatham County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glascock County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Liberty County, GA, Long County, GA, McDuffie County, GA, Montgomery County, GA, Richmond County, GA, Screven County, GA, Tattnall County, GA, Toombs County, GA, Treutlen County, GA, Wheeler County, GA, Allendale County, SC, Beaufort County, SC, Colleton County, SC, Hampton County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 92 km from the middle of the area, began a volume at 17:13 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

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

IssuedProductOfficeCountiesLasted
May 18, 3:35 PM EDTSevere Thunderstorm WarningCHSEvans, Tattnall40 min
May 18, 3:48 PM EDTFlash Flood WarningCHSTattnall117 min
May 18, 4:35 PM EDTSevere Thunderstorm WarningCHSLiberty, Long40 min
May 18, 4:40 PM EDTSevere Thunderstorm WarningFFCBleckley, Laurens35 min
May 18, 5:45 PM EDTFlash Flood WarningCHSTattnall3 hr

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, 5.2 hours before the alert went out and 193 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 12:00Z on 2003-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 180 joules per kilogram.LCLLFCEL10008507005003002001001 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, Charleston AFB, SC at 12:00Z on 2003-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 square meters per square second.1939Sfc1 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
180 J/kg
Mixed-layer CIN
-121 J/kg
Mixed-layer LCL
486 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
192 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 181704
SEL2  
SPC WW 181710
GAZ000-SCZ000-CWZ000-182300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 412 
NWS STORM PREDICTION CENTER NORMAN OK 
110 PM EDT SUN MAY 18 2003

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

       SOUTHEAST GEORGIA
       SOUTHERN SOUTH CAROLINA
       COASTAL WATERS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 110 PM UNTIL 700
PM EDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 70 STATUTE MILES EITHER SIDE
OF A LINE FROM 40 MILES EAST SOUTHEAST OF AUGUSTA GEORGIA TO 55
MILES WEST SOUTHWEST OF SAVANNAH GEORGIA.

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 411...


DISCUSSION...THUNDERSTORMS DEVELOPING ALONG WEDGE BOUNDARY EXPECTED
TO INTENSIFY AS SURFACE HEATING CONTINUES.  LOW LEVEL VEERING WIND
PROFILES.... HIGH BOUNDARY LAYER MOISTURE CONTENT AND RELATIVELY
COOL MID LEVEL TEMPERATURES APPEAR CONDUCIVE TO SEVERE PULSE/SHORT
LIVED SUPERCELL STORMS WITH LARGE HAIL/HIGH WINDS AND ISOLATED
TORNADOES. 

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 25015.


...CORFIDI

323,0801 311,0810 322,0830 334,0822 

WWUS20 KWNS 181704
SEL2  
SPC WW 181710
GAZ000-SCZ000-CWZ000-182300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 412 
NWS STORM PREDICTION CENTER NORMAN OK 
110 PM EDT SUN MAY 18 2003

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

       SOUTHEAST GEORGIA
       SOUTHERN SOUTH CAROLINA
       COASTAL WATERS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 110 PM UNTIL 700
PM EDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 70 STATUTE MILES EITHER SIDE
OF A LINE FROM 40 MILES EAST SOUTHEAST OF AUGUSTA GEORGIA TO 55
MILES WEST SOUTHWEST OF SAVANNAH GEORGIA.

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 411...


DISCUSSION...THUNDERSTORMS DEVELOPING ALONG WEDGE BOUNDARY EXPECTED
TO INTENSIFY AS SURFACE HEATING CONTINUES.  LOW LEVEL VEERING WIND
PROFILES.... HIGH BOUNDARY LAYER MOISTURE CONTENT AND RELATIVELY
COOL MID LEVEL TEMPERATURES APPEAR CONDUCIVE TO SEVERE PULSE/SHORT
LIVED SUPERCELL STORMS WITH LARGE HAIL/HIGH WINDS AND ISOLATED
TORNADOES. 

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 25015.


...CORFIDI

323,0801 311,0810 322,0830 334,0822

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 18, 11:18 AM EDTMesoscale DiscussionSPCBaker, Bibb, Butts, Calhoun, Carroll, Chattahoochee and 45 more87 min
May 18, 12:00 PM EDTTornado WatchSPCBaker, Baldwin, Bibb, Bleckley, Butts, Calhoun and 58 more5 hr
May 18, 1:16 PM EDTMesoscale DiscussionSPCAtkinson, Bacon, Ben Hill, Berrien, Brantley, Brooks and 9 more119 min
May 18, 1:40 PM EDTSevere Thunderstorm WatchSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 22 more6 hr
May 18, 2:10 PM EDTMesoscale DiscussionSPCBaker, Baldwin, Bibb, Bleckley, Butts, Calhoun and 50 more95 min
May 18, 5:57 PM EDTMesoscale DiscussionSPCBurke, Candler, Columbia, Emanuel, Jefferson, Jenkins and 6 more63 min
May 18, 6:22 PM EDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 22 more83 min

Nearby

Tornado Watches in Georgia, 2003Tornado Watches in South Carolina, 2003Every tornado watch in 2003

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.