PDS 2
Posted by JAC on 5/25/2011, 1:50 pm



URGENT - IMMEDIATE BROADCAST REQUESTED
  TORNADO WATCH NUMBER 371
  NWS STORM PREDICTION CENTER NORMAN OK
  1230 PM CDT WED MAY 25 2011
 
  THE NWS STORM PREDICTION CENTER HAS ISSUED A
  TORNADO WATCH FOR PORTIONS OF
 
         CENTRAL AND EASTERN ARKANSAS
         MISSOURI BOOTHEEL
         NORTHERN MISSISSIPPI
         WESTERN TENNESSEE
 
  EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL
  1000 PM CDT.
 
 ...THIS IS A PARTICULARLY DANGEROUS SITUATION...
 
  DESTRUCTIVE TORNADOES...LARGE HAIL TO 3 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 85 STATUTE
  MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTHWEST OF LITTLE
  ROCK ARKANSAS TO 50 MILES EAST SOUTHEAST OF JACKSON TENNESSEE.
  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
  OUTLINE UPDATE (WOUS64 KWNS WOU1).
 
  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 367...WW 368...WW
  369...WW 370...
 
  DISCUSSION...TSTM INITIATION IS EXPECTED WITHIN THE NEXT ONE TO TWO
  HOURS WITHIN BROADLY CONFLUENT LOW-LEVEL FLOW REGIME IN PLACE ACROSS
  AR.  HERE...AIR MASS IS ALREADY MODERATELY UNSTABLE WITH MLCAPE OF
  2500 J/KG WITH FURTHER DESTABILIZATION EXPECTED THIS AFTERNOON.
  THIS INSTABILITY AXIS COINCIDES WITH A 60-70 KT MIDLEVEL JET STREAK
  AND 40-50 KT LLJ...RESULTING IN VERY STRONG LOW AND DEEP-LAYER SHEAR
  ACROSS THE BROAD WARM SECTOR.  CURRENT INDICATIONS ARE THAT ONE OR
  MULTIPLE FAST-MOVING BANDS OF SUPERCELLS ARE LIKELY THIS AFTERNOON
  INTO EVENING WITH A THREAT FOR TORNADOES...SOME POTENTIAL STRONG TO
  VIOLENT AND LONG-TRACKED...VERY LARGE HAIL AND DAMAGING WINDS.
 
  AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
  SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
  WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
  500. MEAN STORM MOTION VECTOR 25040.
 
 
  ...MEAD
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Mid MS-River Area under High-Risk for Severe Weather Today - JAC, 5/25/2011, 9:01 am
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