Wednesday, April 27, 2011

April 27: PDS Tornado Watch #1


URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 232
   NWS STORM PREDICTION CENTER NORMAN OK
   1105 AM CDT WED APR 27 2011
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          EXTREME SOUTHEAST ARKANSAS
          NORTHEAST LOUISIANA
          MUCH OF MISSISSIPPI
   
   EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1105 AM UNTIL
   700 PM CDT.
   
   ...THIS IS A PARTICULARLY DANGEROUS SITUATION...
   
   DESTRUCTIVE TORNADOES...LARGE HAIL TO 4 INCHES IN DIAMETER...
   THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE
   POSSIBLE IN THESE AREAS.
   
   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
   MILES EAST AND WEST OF A LINE FROM 45 MILES EAST SOUTHEAST OF
   NATCHEZ MISSISSIPPI TO 50 MILES NORTH OF TUPELO MISSISSIPPI.  FOR
   A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU2).
   
   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 229...WW 230...WW 231...
   
   DISCUSSION...A VERY VOLATILE SETUP IS DEVELOPING FOR PORTIONS OF MS
   LATER TODAY AS A MOIST AND VERY UNSTABLE AIR MASS RETURNS INTO AN
   AREA WITH IMPRESSIVE LOW LEVEL AND DEEP LAYER VERTICAL SHEAR
   PROFILES.  ACTIVITY IS CURRENTLY DEVELOPING OVER SOUTHEAST
   AR/NORTHEAST LA.  HOWEVER...IT APPEARS THE PRIMARY CONCERN WILL
   START BY EARLY AFTERNOON OVER CENTRAL/NORTHERN MS WHERE DISCRETE
   TORNADIC SUPERCELLS ARE LIKELY.  ALL PARAMETERS SUGGEST THAT
   STRONG/VIOLENT AND LONG-TRACK TORNADOES ARE POSSIBLE.  VERY LARGE
   HAIL AND WIDESPREAD DAMAGING WINDS ARE ALSO A CONCERN.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   550. MEAN STORM MOTION VECTOR 25040.
   

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