MESOSCALE DISCUSSION 1539
   NWS STORM PREDICTION CENTER NORMAN OK
   1255 AM CDT MON JUL 13 2009
   
   AREAS AFFECTED...ERN WA AND NRN PNHDL ID
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 575...
   
   VALID 130555Z - 130700Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 575
   CONTINUES.
   
   OUTFLOW BOUNDARY GENERATED BY EVENING TSTMS HAS PROGRESSED NWD
   ALMOST TO BRITISH COLUMBIA AS OF 0545Z.  A SIGNIFICANT DECREASE IN
   THE INTENSITY OF STORMS HAS BEEN NOTED OWING TO DECREASING MLCAPE
   ATTENDANT WITH NOCTURNAL COOLING.  
   
   UPR LVL TROUGH CONTINUES TO SPIN ENE THROUGH CNTRL ORE WITH EXIT
   REGION OF A 70 KT H5 JET SPREADING NWD TOWARD THE REGION.  WAVES OF
   TSTMS WILL REMAIN PSBL THROUGH EARLY MORNING MONDAY ACROSS
   ESPECIALLY ERN/CNTRL ORE.  GUSTY WINDS AND PERHAPS HAIL MAY
   ACCOMPANY STRONGER STORMS.
   
   ..RACY.. 07/13/2009
   
   
   ATTN...WFO...OTX...
   
   LAT...LON   46811764 47681858 48491841 48701705 48641657 48111632
               46961667 46811764