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Severe Thunderstorm Watch 221
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WW0221 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Low Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 221
   NWS STORM PREDICTION CENTER NORMAN OK
   225 PM CDT FRI MAY 1 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHERN ALABAMA
          NORTHEAST MISSISSIPPI
          SOUTHERN AND MIDDLE TENNESSEE
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 225 PM UNTIL 700
   PM CDT.
   
   HAIL TO 1.5 INCHES 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 50
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST OF
   MUSCLE SHOALS ALABAMA TO 75 MILES EAST NORTHEAST OF HUNTSVILLE
   ALABAMA.  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.
   
   DISCUSSION...MCS ACROSS TN VALLEY SHOULD CONTINUE TO STRENGTHEN WITH
   DIURNAL HEATING OF THE DAY AND CONTINUING INCREASE IN MASS INFLOW ON
   THE NOSE OF 30KT LLJ. ABUNDANT INSTABILITY FEEDING INTO THIS
   COMPLEX...AND PRESENCE OF ENHANCED LOW LEVEL STORM RELATIVE FLOW
   NEAR RESIDUAL OUTFLOW/WARM FRONT ACROSS AL...SHOULD CONTRIBUTE TO
   UPDRAFT PERSISTENCE. MESOSCALE ORGANIZATION...COUPLED WITH WARMING
   BOUNDARY LAYER...SHOULD SUPPORT OCCASIONAL DAMAGING WIND GUSTS AND
   PERHAPS SOME HAIL FORM SOME OF THE STRONGER CORES.
   
   AVIATION...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 30020.
   
   
   ...CARBIN
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