Alert archive / North Carolina / Tornado Watches in 2008

Tornado Watch 66

February 18, 200832 counties in North Carolina; 8 counties in South Carolina

The Storm Prediction Center issued this tornado watch at Feb 18, 2008, 2:30 AM EST for 32 counties in North Carolina; 8 counties in South Carolina. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Feb 18, 2008, 2:30 AM EST (07:30 UTC)
Expired
Feb 18, 2008, 9:59 AM EST
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 40 counties

Beaufort County, NC, Bladen County, NC, Brunswick County, NC, Carteret County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Dare County, NC, Duplin County, NC, Edgecombe County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hoke County, NC, Hyde County, NC, Johnston County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, Nash County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pender County, NC, Pitt County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Tyrrell County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Darlington County, SC, Dillon County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 80 km from the middle of the area, began a volume at 07:29 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
50%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
5%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Feb 18, 2:45 AM ESTTornado WarningILMRobeson30 min
Feb 18, 2:58 AM ESTSevere Thunderstorm WarningRAHWayne47 min
Feb 18, 3:11 AM ESTTornado WarningRAHWayne34 min
Feb 18, 3:26 AM ESTTornado WarningILMBladen19 min
Feb 18, 3:35 AM ESTSevere Thunderstorm WarningMHXLenoir25 min
Feb 18, 3:38 AM ESTSevere Thunderstorm WarningRAHSampson37 min
Feb 18, 4:32 AM ESTSevere Thunderstorm WarningMHXDuplin43 min
Feb 18, 4:56 AM ESTSevere Thunderstorm WarningMHXWashington34 min
Feb 18, 4:58 AM ESTSevere Thunderstorm WarningMHXJones47 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Newport, NC (KMHX), launched 00:00Z, 7.5 hours before the alert went out and 129 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 2008-02-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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, Newport, NC at 00:00Z on 2008-02-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 square meters per square second.19395878Sfc1 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
3 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
992 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
159 m²/s²
0-3 km storm-relative helicity
164 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000
WWUS20 KWNS 180729
SEL6  
SPC WW 180729
NCZ000-SCZ000-CWZ000-181600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 66
NWS STORM PREDICTION CENTER NORMAN OK
230 AM EST MON FEB 18 2008

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

       EASTERN NORTH CAROLINA
       NORTHEASTERN SOUTH CAROLINA
       COASTAL WATERS

EFFECTIVE THIS MONDAY MORNING FROM 230 AM UNTIL 1100 AM EST.

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

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTHEAST OF FLORENCE
SOUTH CAROLINA TO 65 MILES NORTH NORTHWEST OF CAPE HATTERAS NORTH
CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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...REMAINS OF SQLN THAT AFFECTED AL/GA SUNDAY AFTN ARE
MOVING E INTO THE SC/NC CSTL PLN ATTM INVOF FLO/FAY.  THIS ACTIVITY
MAY INCREASE IN STRENGTH AND COVERAGE AS IT ENCOUNTERS LOW-LEVEL
MOISTURE AXIS ASSOCIATED WITH WELL-DEFINED SLY LLJ ORIENTED ROUGHLY
BETWEEN MYR AND HAT.  GIVEN INTENSE LOW TO MID-LEVEL SPEED SHEAR AND
LIKELIHOOD FOR INCREASING LARGE SCALE ASCENT ASSOCIATED WITH
APPROACHING UPR TROUGH...THREAT WILL EXIST FOR SUSTAINED SUPERCELLS
WITH LOCALLY DAMAGING WIND AND TORNADOES.

AVIATION...TORNADOES AND 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 400.
MEAN STORM MOTION VECTOR 22050.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 18, 2:04 AM ESTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Brunswick, Carteret, Chowan and 22 more26 min
Feb 18, 3:45 AM ESTMesoscale DiscussionSPCCamden, Chowan, Currituck, Gates, Hertford, Northampton and 2 more30 min
Feb 18, 3:59 AM ESTTornado WatchSPCBertie, Camden, Chowan, Currituck, Gates, Hertford and 3 more6 hr
Feb 18, 6:18 AM ESTMesoscale DiscussionSPCBeaufort, Brunswick, Camden, Carteret, Chowan, Craven and 12 more57 min
Feb 17, 8:34 PM ESTMesoscale DiscussionSPCAiken, Allendale, Barnwell, Edgefield, McCormick, Saluda56 min
Feb 17, 11:35 PM ESTMesoscale DiscussionSPCAiken, Allendale, Bamberg, Barnwell, Calhoun, Clarendon and 7 more85 min

Nearby

Tornado Watches in North Carolina, 2008Tornado Watches in South Carolina, 2008Every tornado watch in 2008

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.