Tornado Watch 845

Issued

Sep 6, 2011, 5:17 AM EDT (09:17 UTC)

Expired

Sep 6, 2011, 2:00 PM EDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

60 kt

The Raleigh/Durham radar (KRAX), 53 km from the middle of the area, began a volume at 09:19 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.

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

20%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

50%

• Mesoscale Discussion 2141Sep 6, 3:30 AM EDT
• Mesoscale Discussion 2142Sep 6, 4:36 AM EDT
• Mesoscale Discussion 2143Sep 6, 8:35 AM EDT
• Mesoscale Discussion 2144Sep 6, 12:41 PM EDT

056 
WWUS20 KWNS 060920
SEL5  
SPC WW 060920
NCZ000-SCZ000-VAZ000-CWZ000-061800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 845
NWS STORM PREDICTION CENTER NORMAN OK
520 AM EDT TUE SEP 6 2011

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

       CENTRAL AND EASTERN NORTH CAROLINA
       EASTERN SOUTH CAROLINA
       SOUTHERN VIRGINIA
       COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 520 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 APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES WEST NORTHWEST OF
SOUTH HILL VIRGINIA TO 15 MILES SOUTH SOUTHWEST OF MYRTLE BEACH
SOUTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

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...SCTD SHOWERS AND WEAK TSTMS HAVE SLOWLY BEEN FORMING IN
THE PAST 90 MINUTES OR SO ALONG N/S AXIS OF ENHANCED CAPE EXTENDING
FROM NEAR MYR TO DAN.  THE INCREASE IN CONVECTION MAY BE ASSOCIATED
WITH STRENGTHENING LOW LVL CONFLUENCE DOWNSTREAM FROM LOW LVL
REMNANT OF T.D. LEE.  GIVEN STRENGTH OF LOW LVL WIND FIELD WITH
SIZABLE LOW LVL SHEAR...RICH LOW LVL MOISTURE...AND WEAK LINEAR
FORCING FOR ASCENT...SETUP MAY YIELD A FEW LOW-TOPPED SUPERCELLS
WITH A THREAT FOR TORNADOES AND/OR SMALL BOWS WITH DMGG WIND.

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
400. MEAN STORM MOTION VECTOR 20035.


...CORFIDI

Tornado Watches in North Carolina, 2011Tornado Watches in Virginia, 2011Tornado Watches in South Carolina, 2011Every tornado watch in 2011

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.