Tornado Watch 115

Issued

Apr 9, 2011, 6:16 PM EDT (22:16 UTC)

Expired

Apr 9, 2011, 11:54 PM EDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Greer radar (KGSP), 33 km from the middle of the area, began a volume at 22:19 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

40%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 386Apr 9, 4:21 PM EDT
• Mesoscale Discussion 387Apr 9, 5:36 PM EDT
• Mesoscale Discussion 390Apr 9, 7:59 PM EDT
• Mesoscale Discussion 393Apr 9, 10:39 PM EDT

203 
WWUS20 KWNS 092218
SEL5
SPC WW 092218
NCZ000-SCZ000-100600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 115
NWS STORM PREDICTION CENTER NORMAN OK
615 PM EDT SAT APR 9 2011

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

       WESTERN AND SOUTHERN NORTH CAROLINA
       UPSTATE AND PIEDMONT SOUTH CAROLINA

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 615 PM
UNTIL 200 AM EDT.

TORNADOES...HAIL TO 2.5 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 EITHER SIDE OF A LINE FROM 35 MILES NORTH OF ASHEVILLE
NORTH CAROLINA TO 25 MILES EAST SOUTHEAST OF ORANGEBURG 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.

OTHER WATCH INFORMATION...CONTINUE...WW 113...WW 114...

DISCUSSION...TSTMS/SUPERCELLS EXPECTED TO PERSIST ALONG DEEP FRONTAL
ZONE ORIENTED WNW/ESE FROM WRN NC INTO N CNTRL SC.  INSTABILITY WILL
BE IMPORTED BY STRENGTHENING WSWLY 850-700 MB FLOW ASSOCIATED WITH
UPR VORT/MCS PASSING BY TO THE N.  LENGTHENING HODOGRAPHS AND
ASSOCIATED STEEP LAPSE RATE PLUME COULD SUPPORT IN INCREASING
POTENTIAL FOR LOW-LVL MESOCYCLONES/TORNADOES GIVEN FAIRLY MOIST
LOW-LVL ENVIRONMENT INVOF WEAK BACK-DOOR FRONT AT THE SFC...WITH THE
THREAT CONTINUING INTO TONIGHT DESPITE LOSS OF DAYTIME HEATING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 29030.


...CORFIDI

Tornado Watches in South Carolina, 2011Tornado Watches in North 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.