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WWUS20 KWNS 281835

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SPC WW 281835

ALZ000-GAZ000-NCZ000-SCZ000-TNZ000-010100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 33

NWS STORM PREDICTION CENTER NORMAN OK

130 PM EST MON FEB 28 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND NORTHEAST ALABAMA

       NORTHWEST GEORGIA

       WESTERN NORTH CAROLINA

       UPSTATE SOUTH CAROLINA

       SOUTHERN MIDDLE AND EASTERN TENNESSEE



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 800

PM EST.



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 110 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH OF HICKORY

NORTH CAROLINA TO 50 MILES SOUTHEAST OF TUSCALOOSA ALABAMA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 31. WATCH NUMBER 31 WILL NOT BE IN EFFECT AFTER 130

PM EST. CONTINUE...WW 32...



DISCUSSION...STORM COVERAGE/INTENSITY SHOULD INCREASE THROUGH THE

AFTERNOON ALONG AND IMMEDIATELY AHEAD OF A WEAK SURFACE WAVE ACROSS

MIDDLE TN...AND IN ADVANCE OF A MIDLEVEL TROUGH OVER NRN MS/WRN

TN/WRN KY.  THE STORM ENVIRONMENT REMAINS FAVORABLE FOR SUPERCELLS

AND A FEW TORNADOES ACROSS SE TN/AL/NW GA PER THE 18Z BMX SOUNDING.

FARTHER N...STORMS IN ERN TN WILL DEVELOP EWD INTO NW NC...ALONG THE

OUTFLOW BOUNDARY FROM THE EARLIER CONVECTION THAT CROSSED INTO VA.

INSTABILITY WILL BE A LITTLE WEAKER THAN AREAS FARTHER SW...BUT

VERTICAL SHEAR REMAINS STRONG...AND THE POTENTIAL WILL REMAIN FOR

EMBEDDED SUPERCELL STRUCTURES.  LATER DURING THE

AFTERNOON...CONVECTION IS EXPECTED TO EVOLVE INTO MORE OF A LINEAR

SYSTEM WITH A THREAT FOR DAMAGING WINDS AND BRIEF SPIN UPS ALONG THE

BOWING LINE SEGMENTS.



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

450. MEAN STORM MOTION VECTOR 26045.





...THOMPSON

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