MESOSCALE DISCUSSION 0559
   NWS STORM PREDICTION CENTER NORMAN OK
   0759 PM CDT FRI APR 26 2013
   
   AREAS AFFECTED...CNTRL AND ERN OK
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 139...
   
   VALID 270059Z - 270300Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 139
   CONTINUES.
   
   SUMMARY...A FEW SEVERE THUNDERSTORMS WILL CONTINUE TO MOVE ESEWD
   ACROSS CNTRL OK AND EVENTUALLY E OF THE CURRENT WATCH. A NEW WW MAY
   BE REQUIRED BY 03Z.
   
   DISCUSSION...A LINE OF THUNDERSTORMS CURRENTLY EXISTS ALONG AN
   ADVANCING COLD FRONT ASSOCIATED WITH THE SHORTWAVE TROUGH. COOLING
   ALOFT AND DEEP FORCING FOR ASCENT WILL MAINTAIN THESE STORMS THROUGH
   THE EVENING DESPITE A RELATIVELY MARGINAL THERMODYNAMIC ENVIRONMENT
   AS SEEN ON 00Z OUN SOUNDING. COUNTERACTING MARGINAL INSTABILITY WILL
   ALSO BE AN INCREASING LOW LEVEL JET WITH 30-35 KT SLY FLOW EXPECTED.
   
   THE STRONGEST CELL IS CURRENTLY ENTERING CANADIAN COUNTY WITH LARGE
   HAIL AND DAMAGING WIND LIKELY. AT ITS CURRENT SPEED...THIS SEVERE
   STORM WILL ENTER WRN OK COUNTY AROUND 845 PM CDT...AND DOWNTOWN OKC
   AROUND 900 PM CDT WITH DAMAGING HAIL AND WIND. THIS CELL MAY
   EVENTUALLY TURN RIGHT AS THE INCREASING LOW LEVEL JET INCREASES THE
   PROPAGATIONAL COMPONENT OF THE MOTION.
   
   ..JEWELL.. 04/27/2013
   
   
   ATTN...WFO...TSA...OUN...
   
   LAT...LON   35219898 36029805 35409538 34889517 34389529 34059574
               34009634 34519781 35219898