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Severe Thunderstorm Watch 288
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WW0288 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL8
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 288
   NWS STORM PREDICTION CENTER NORMAN OK
   120 PM MDT FRI MAY 9 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHEAST COLORADO
          NORTHWEST KANSAS
          SOUTHWEST NEBRASKA
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 120 PM UNTIL 900
   PM MDT.
   
   HAIL TO 2 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 70
   STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH
   NORTHEAST OF AKRON COLORADO TO 45 MILES SOUTH SOUTHEAST OF
   GOODLAND KANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
   
   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...CONTINUE...WW 287...
   
   DISCUSSION...STORM INITIATION SHOULD ENSUE AS UPPER TROUGH SPREADS
   EAST THROUGH LATE AFTERNOON AND DEEP-LAYER ASCENT STRENGTHENS ACROSS
   THE HIGH PLAINS. INCREASING LOW LEVEL SELY FLOW WAS TRANSPORTING
   MID-UPR 40S DEWPOINTS NWWD BENEATH STEEPENING LAPSE RATES. IN
   COMBINATION WITH DIURNAL HEATING...A NARROW CORRIDOR OF SBCAPE
   AROUND 500 J PER KG HAS ALREADY FORMED. THIS INSTABILITY SHOULD BE
   SUFFICIENT FOR A FEW STOUT/ORGANIZED UPDRAFTS WITH HAIL AND STRONG
   WINDS GIVEN EFFECTIVE BULK SHEAR OF 30-40KT.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM
   MOTION VECTOR 29025.
   
   
   ...CARBIN
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