Alert archive / North Carolina / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 271

May 9, 200213 counties in North Carolina; 11 counties in South Carolina

The Storm Prediction Center issued this severe thunderstorm watch at May 9, 2002, 7:00 PM EDT for 13 counties in North Carolina; 11 counties in South Carolina. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
May 9, 2002, 7:00 PM EDT (23:00 UTC)
Expired
May 9, 2002, 11:00 PM EDT
In force
4 hr
Issued by
the Storm Prediction Center
All 24 counties

Cabarrus County, NC, Catawba County, NC, Cleveland County, NC, Davidson County, NC, Gaston County, NC, Iredell County, NC, Lincoln County, NC, Mecklenburg County, NC, Montgomery County, NC, Randolph County, NC, Rowan County, NC, Stanly County, NC, Union County, NC, Abbeville County, SC, Cherokee County, SC, Chester County, SC, Fairfield County, SC, Greenwood County, SC, Lancaster County, SC, Laurens County, SC, Newberry County, SC, Spartanburg County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 71 km from the middle of the area, began a volume at 23:01 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

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

IssuedProductOfficeCountiesLasted
May 9, 7:12 PM EDTSevere Thunderstorm WarningGSPAbbeville33 min
May 9, 7:22 PM EDTSevere Thunderstorm WarningGSPCherokee38 min
May 9, 7:49 PM EDTSevere Thunderstorm WarningGSPAbbeville, Greenwood41 min

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 11.0 hours before the alert went out and 200 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, Greensboro/Hi Pt, NC at 12:00Z on 2002-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 450 joules per kilogram.LCLLFCEL10008507005003002001001 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, Greensboro/Hi Pt, NC at 12:00Z on 2002-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
450 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
977 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 092240
SEL1  
SPC WW 092237
NCZ000-SCZ000-100300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 271
STORM PREDICTION CENTER NORMAN OK
637 PM EDT THU MAY 9 2002

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

   WESTERN NORTH CAROLINA                     
   WESTERN SOUTH CAROLINA                     

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 700 PM UNTIL
1100 PM EDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 50 STATUTE MILES
EAST AND WEST OF A LINE FROM 60 MILES SOUTH OF SPARTANBURG SOUTH
CAROLINA TO 65 MILES EAST NORTHEAST OF HICKORY NORTH 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 269...WW 270...

DISCUSSION...LINE OF THUNDERSTORMS IS INTENSIFYING ALONG EAST EDGE
OF MOUNTAINS OVER THE WESTERN CAROLINAS.  THESE STORMS SHOULD MOVE
EASTWARD FOR THE NEXT SEVERAL HOURS INTO MOIST/UNSTABLE AIRMASS. 
DAMAGING WINDS APPEAR TO BE THE MAIN THREAT.

AVIATION...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 500.  MEAN STORM
MOTION VECTOR 27035.

...HART

360,0792 340,0810 340,0825 360,0811

WWUS20 KWNS 092240
SEL1  
SPC WW 092237
NCZ000-SCZ000-100300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 271
STORM PREDICTION CENTER NORMAN OK
637 PM EDT THU MAY 9 2002

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

   WESTERN NORTH CAROLINA                     
   WESTERN SOUTH CAROLINA                     

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 700 PM UNTIL
1100 PM EDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 50 STATUTE MILES
EAST AND WEST OF A LINE FROM 60 MILES SOUTH OF SPARTANBURG SOUTH
CAROLINA TO 65 MILES EAST NORTHEAST OF HICKORY NORTH 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 269...WW 270...

DISCUSSION...LINE OF THUNDERSTORMS IS INTENSIFYING ALONG EAST EDGE
OF MOUNTAINS OVER THE WESTERN CAROLINAS.  THESE STORMS SHOULD MOVE
EASTWARD FOR THE NEXT SEVERAL HOURS INTO MOIST/UNSTABLE AIRMASS. 
DAMAGING WINDS APPEAR TO BE THE MAIN THREAT.

AVIATION...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 500.  MEAN STORM
MOTION VECTOR 27035.

...HART

360,0792 340,0810 340,0825 360,0811

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 11:30 AM EDTSevere Thunderstorm WatchSPCAshe, Avery, Buncombe, Burke, Caldwell, Cherokee and 16 more6 hr
May 9, 6:15 PM EDTSevere Thunderstorm WatchSPCCaswell, Forsyth, Granville, Person, Rockingham, Stokes and 3 more5 hr

Nearby

Severe Thunderstorm Watches in North Carolina, 2002Severe Thunderstorm Watches in South Carolina, 2002Every 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.