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Tornado Watch 99
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WW0099 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 99
   NWS STORM PREDICTION CENTER NORMAN OK
   550 PM EST TUE MAR 4 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          DISTRICT OF COLUMBIA
          MARYLAND
          EASTERN NORTH CAROLINA
          EASTERN AND NORTHERN VIRGINIA
          COASTAL WATERS
   
   EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 550
   PM UNTIL 300 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 60 STATUTE
   MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF
   NEW BERN NORTH CAROLINA TO 40 MILES NORTH NORTHWEST OF WASHINGTON
   DISTRICT OF COLUM.  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...CONTINUE...WW 96...WW 97...WW 98...
   
   DISCUSSION...VERY INTENSE VERTICAL MOTION FIELDS AND LOW/DEEP LAYER
   SHEAR WILL OVERSPREAD THIS REGION THROUGH TONIGHT AS STRONG UPPER
   SYSTEM BEGINS TO LIFT NEWD ACROSS THE APPALACHIANS.  ALTHOUGH
   INSTABILITY WILL REMAIN MEAGER...MOISTENING LOW LEVELS CONCURRENT
   WITH 70+ KT SLY LLJ WILL ENHANCE THE POTENTIAL FOR LOW LEVEL
   ROTATION AND POSSIBLE TORNADOES.  ACTIVITY MAY OCCUR IN TWO
   BANDS...ONE NOW MOVING INTO CENTRAL NC/VA AND ANOTHER SPREADING
   ENEWD ALONG THE MAIN COLD FRONT LATER TONIGHT.  SEVERE/TORNADO
   THREAT MAY PERSIST WELL INTO THE NIGHT UNTIL THE LATER BAND MOVES
   OFFSHORE.
   
   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 23040.
   
   
   ...EVANS
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