Alert archive / North Carolina / Tornado Watches in 2002

Tornado Watch 679

September 10, 200223 counties in North Carolina

The Storm Prediction Center issued this tornado watch at Sep 10, 2002, 7:55 AM EDT for 23 counties in North Carolina. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Sep 10, 2002, 7:55 AM EDT (11:55 UTC)
Expired
Sep 10, 2002, 2:00 PM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 23 counties

Beaufort County, NC, Bertie County, NC, Camden County, NC, Carteret County, NC, Chowan County, NC, Craven County, NC, Currituck County, NC, Dare County, NC, Duplin County, NC, Greene County, NC, Hertford County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC

The radar

The Morehead City radar (KMHX), 54 km from the middle of the area, began a volume at 11:55 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

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

IssuedProductOfficeCountiesLasted
Sep 10, 11:45 AM EDTTornado WarningMHXHyde30 min

The nearest sounding before it

Newport, NC (KMHX), launched 00:00Z, 11.9 hours before the alert went out and 54 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, Newport, NC at 00:00Z on 2002-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 597 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, Newport, NC at 00:00Z on 2002-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 221 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
597 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
557 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
221 m²/s²
0-3 km storm-relative helicity
297 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 101156
SEL9  
SPC WW 101155
NCZ000-CWZ000-101800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 679
STORM PREDICTION CENTER NORMAN OK
755 AM EDT TUE SEP 10 2002

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

   EASTERN NORTH CAROLINA                     
   AND ADJACENT COASTAL WATERS                     

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 755 AM UNTIL 200
PM 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 65 STATUTE MILES EAST AND WEST
OF A LINE FROM 35 MILES SOUTHEAST OF JACKSONVILLE NORTH CAROLINA TO
10 MILES NORTH OF ELIZABETH CITY NORTH 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.


DISCUSSION...OUTER BANDS OF SUBTROPICAL STORM GUSTAV ARE NOW MOVING
OVER AREAS OF ERN NC AND THE OUTER BANKS.  STORM ENVIRONMENT SHOWS
MUCAPE AROUND 1500 J/KG OF MUCAPE WITH 0-1KM HELICITY OF 100-200
M2/S2.  THUS...SOME STORMS WITHIN THESE BANDS HAVE THE POTENTIAL TO
ROTATE AND PRODUCE BRIEF 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 500. 
MEAN STORM MOTION VECTOR 06035.


...MCCARTHY

342,0781 362,0772 362,0750 342,0760

Nearby

Tornado Watches in North Carolina, 2002Every tornado 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.