High Risk for Tornadoes
Posted by JAC on 5/24/2010, 1:35 pm
http://w1.spc.woc.noaa.gov/products/watch/ww0213.html




URGENT - IMMEDIATE BROADCAST REQUESTED
  TORNADO WATCH NUMBER 213
  NWS STORM PREDICTION CENTER NORMAN OK
  1120 AM MDT MON MAY 24 2010
 
  THE NWS STORM PREDICTION CENTER HAS ISSUED A
  TORNADO WATCH FOR PORTIONS OF
 
         WESTERN NEBRASKA
         WESTERN AND CENTRAL SOUTH DAKOTA
         EXTREME SOUTHEAST WYOMING
 
  EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1120 AM UNTIL 800
  PM MDT.
 
  TORNADOES...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 EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHWEST OF
  MOBRIDGE SOUTH DAKOTA TO 15 MILES EAST SOUTHEAST OF SIDNEY
  NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
  ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
 
  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 212...
 
  DISCUSSION...THUNDERSTORM DEVELOPMENT IS JUST BEGINNING ACROSS
  EXTREME NE CO/SE WY AND THE NEB PANHANDLE.  THIS CONVECTION WILL
  LIKELY EVOLVE INTO DISCRETE SUPERCELLS IN AN ENVIRONMENT OF STRONG
  VERTICAL SHEAR AND MODERATE INSTABILITY...IN ADVANCE OF A NEGATIVE
  TILT SHORTWAVE TROUGH AND SURFACE LOW MOVING NNEWD FROM CO.  THE
  COMBINATION OF BOUNDARY LAYER DEWPOINTS IN THE MID 60S AND ENHANCED
  LOW-LEVEL SHEAR NEAR THE SURFACE WARM FRONT WILL ENHANCE THE THREAT
  FOR TORNADOES...INCLUDING AN ISOLATED STRONG TORNADO OR TWO...AS
  WELL AS VERY LARGE HAIL.  OTHERWISE...CONVECTION MAY EVOLVE MORE
  INTO CLUSTERS WITH EMBEDDED SUPERCELL STRUCTURES BY LATE
  AFTERNOON...WITH THE ADDITIONAL THREAT OF DAMAGING WINDS.
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Another Rough Day for SD & NE Today - JAC, 5/24/2010, 10:12 am
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