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Severe Thunderstorm Watch 161
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WW0161 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 161
   NWS STORM PREDICTION CENTER NORMAN OK
   245 AM CDT FRI APR 4 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST ALABAMA
          EASTERN ARKANSAS
          NORTHERN MISSISSIPPI
          WESTERN AND MIDDLE TENNESSEE
   
   EFFECTIVE THIS FRIDAY MORNING FROM 245 AM UNTIL 1100 AM CDT.
   
   HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90
   STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTHWEST OF
   OXFORD MISSISSIPPI TO 25 MILES NORTH NORTHEAST OF NASHVILLE
   TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
   
   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.
   
   OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
   SEVERE THUNDERSTORM WATCH NUMBER 159. WATCH NUMBER 159 WILL NOT
   BE IN EFFECT AFTER 245 AM CDT. CONTINUE...WW 157...WW 158...WW
   160...
   
   DISCUSSION...SQLN WITH EMBEDDED LEWPS/SUPERCELLS EXPECTED TO
   CONTINUE ENE IN VERY STRONGLY-SHEARED LOW- TO MID-LEVEL ENVIRONMENT
   /70 KT SW 500 MB FLOW ATOP 50+ KT SSW LLJ/.  MARGINAL INSTABILITY
   AND EXISTING QUASI-LINEAR STRUCTURE SUGGEST THAT PRIMARY SVR THREAT
   SHOULD BE DMGG WIND/MARGINALLY SVR HAIL.  BUT AN ISOLATED TORNADO OR
   TWO COULD OCCUR INVOF BOW HEADS AND/OR INVOF N/S WARM FRONT IN
   MIDDLE TN/NW AL...GIVEN STRENGTH OF LOW LEVEL SHEAR.
   
   AVIATION...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 500. MEAN STORM MOTION
   VECTOR 25035.
   
   
   ...CORFIDI
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