Alert archive / North Carolina / Tornado Watches in 2010

Tornado Watch 39

March 28, 20104 states

The Storm Prediction Center issued this tornado watch at Mar 28, 2010, 10:58 PM EDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Mar 28, 2010, 10:58 PM EDT (02:58 UTC)
Expired
Mar 29, 2010, 5:00 AM EDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 88 counties

Baldwin County, GA, Burke County, GA, Columbia County, GA, Glascock County, GA, Hancock County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lincoln County, GA, McDuffie County, GA, Richmond County, GA, Twiggs County, GA, Warren County, GA, Washington County, GA, Wilkinson County, GA, Alamance County, NC, Anson County, NC, Bladen County, NC, Cabarrus County, NC, Caswell County, NC, Chatham County, NC, Cumberland County, NC, Davidson County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Mecklenburg County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Northampton County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Rowan County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC, Aiken County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, McCormick County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Union County, SC, York County, SC, Brunswick County, VA, Charlotte County, VA, City of Emporia, VA, Greensville County, VA, Halifax County, VA, Lunenburg County, VA, Mecklenburg County, VA

The radar

The Raleigh/Durham radar (KRAX), 131 km from the middle of the area, began a volume at 03:01 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.

What SPC expected

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

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
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
Mar 28, 11:13 PM EDTSevere Thunderstorm WarningFFCHancock, Warren47 min
Mar 28, 11:16 PM EDTTornado WarningCAELexington, Saluda44 min
Mar 28, 11:21 PM EDTSevere Thunderstorm WarningRAHAlamance, Durham, Orange, Person54 min
Mar 28, 11:26 PM EDTTornado WarningRAHAlamance, Durham, Orange, Person49 min
Mar 28, 11:30 PM EDTSevere Thunderstorm WarningCAELincoln45 min
Mar 28, 11:48 PM EDTTornado WarningCAEFairfield, Lexington, Richland42 min
Mar 28, 11:56 PM EDTTornado WarningRAHDurham, Granville, Person34 min
Mar 29, 12:15 AM EDTSevere Thunderstorm WarningCAEFairfield, Lancaster45 min
Mar 29, 12:24 AM EDTFlash Flood WarningRAHGuilford3 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

Roanoke, VA (KRNK), launched 00:00Z, 3.0 hours before the alert went out and 217 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, Roanoke, VA at 00:00Z on 2010-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Roanoke, VA at 00:00Z on 2010-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 169 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
443 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
169 m²/s²
0-3 km storm-relative helicity
182 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.

336 
WWUS20 KWNS 290258
SEL9
SPC WW 290258
GAZ000-NCZ000-SCZ000-VAZ000-290900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 39
NWS STORM PREDICTION CENTER NORMAN OK
1100 PM EDT SUN MAR 28 2010

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

       EAST CENTRAL GEORGIA
       CENTRAL NORTH CAROLINA
       CENTRAL SOUTH CAROLINA
       SOUTH CENTRAL VIRGINIA

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1100 PM UNTIL
500 AM EDT.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH NORTHEAST OF
ROCKY MOUNT NORTH CAROLINA TO 65 MILES WEST OF AUGUSTA GEORGIA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 37...TORNADO WATCH NUMBER 38. WATCH NUMBER 37 38
WILL NOT BE IN EFFECT AFTER 1100 PM EDT.

DISCUSSION...BROKEN BANDS OF STRONG/SEVERE STORMS WILL PERSIST
OVERNIGHT ALONG THE STALLED WEDGE FRONT ACROSS THE PIEDMONT OF
NC/SC...AND ALONG A PRE-FRONTAL CONFLUENCE BAND FROM CENTRAL GA INTO
SC.  INSTABILITY WILL REMAIN AT LEAST MARGINALLY SUFFICIENT FOR
SURFACE-BASED STORMS CAPABLE OF PRODUCING LARGE HAIL/DAMAGING
WINDS...WHILE STRONG LOW-LEVEL SHEAR WILL FAVOR THE POTENTIAL FOR A
COUPLE OF TORNADOES WITH THE STRONGER SUPERCELLS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
350. MEAN STORM MOTION VECTOR 24040.


...THOMPSON

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 28, 10:13 PM EDTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Burke, Butts, Columbia and 23 more62 min
Mar 29, 12:25 AM EDTMesoscale DiscussionSPCBurke, Columbia, Glascock, Jefferson, Jenkins, Lincoln and 4 more95 min
Mar 29, 1:54 AM EDTMesoscale DiscussionSPCCamden, Chowan, Currituck, Gates, Hertford, Northampton and 2 more36 min
Mar 29, 3:01 AM EDTMesoscale DiscussionSPCBladen, Brunswick, Carteret, Columbus, Craven, Duplin and 7 more29 min
Mar 29, 3:20 PM EDTMesoscale DiscussionSPCBladen, Columbus, Cumberland, Hoke, Robeson, Sampson and 1 more115 min

Nearby

Tornado Watches in North Carolina, 2010Tornado Watches in South Carolina, 2010Tornado Watches in Georgia, 2010Every tornado watch in 2010

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.