Large-area PDS up
Posted by JAC on 5/25/2011, 12:37 pm





URGENT - IMMEDIATE BROADCAST REQUESTED
  TORNADO WATCH NUMBER 370
  NWS STORM PREDICTION CENTER NORMAN OK
  1110 AM CDT WED MAY 25 2011
 
  THE NWS STORM PREDICTION CENTER HAS ISSUED A
  TORNADO WATCH FOR PORTIONS OF
 
         SOUTHERN ILLINOIS
         SOUTHERN INDIANA
         WESTERN AND CENTRAL KENTUCKY
         EASTERN MISSOURI
 
  EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1110 AM UNTIL
  900 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 75 STATUTE
  MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF FARMINGTON
  MISSOURI TO 40 MILES SOUTH SOUTHEAST OF LOUISVILLE KENTUCKY.  FOR
  A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
  OUTLINE UPDATE (WOUS64 KWNS WOU0).
 
  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...
 
  DISCUSSION...AN OUTBREAK OF TORNADOES --SOME POTENTIALLY STRONG TO
  VIOLENT AND LONG-TRACKED-- IS EXPECTED ACROSS THE WATCH AREA TODAY
  IN ASSOCIATION WITH MULTIPLE WAVES OF SUPERCELLS.  THE COMBINATION
  OF A VERY MOIST BOUNDARY LAYER AND DAYTIME HEATING WILL CONTRIBUTE
  TO A BROAD...MODERATELY TO STRONGLY UNSTABLE WARM SECTOR WITH MLCAPE
  VALUES OF 1500-3500 J/KG.  THIS INSTABILITY WILL COINCIDE WITH 50-60
  KT OF DEEP SWLY SHEAR AND EFFECTIVE SRH OF 300-500 M2/S2...RESULTING
  IN A VOLATILE ENVIRONMENT QUITE FAVORABLE FOR LONG-LIVED SUPERCELLS.
 
  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
  600. MEAN STORM MOTION VECTOR 24035.
 
 
  ...MEAD
45
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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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