MESOSCALE DISCUSSION 0415
   NWS STORM PREDICTION CENTER NORMAN OK
   0539 PM CDT THU APR 09 2009
   
   AREAS AFFECTED...SERN KS/ERN OK/SWRN MO/WRN AR
   
   CONCERNING...TORNADO WATCH 123...
   
   VALID 092239Z - 100045Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 123 CONTINUES.
   
   SEVERE/TORNADO THREAT CONTINUES WITH ONGOING STORMS.
   
   CONVECTION CONTINUES SPREADING EWD/NEWD ACROSS WW 123...WITH THE
   MAIN AXIS OF STORMS EXTENDING SWD IN AN ARC FROM NEAR THE WARM
   FRONT/DRYLINE INTERSECTION INVOF GREENWOOD/ELK COUNTIES IN KS INTO
   ERN OK NEAR/AHEAD OF THE ADVANCING DRYLINE.  
   
   WITH THE PRE-DRYLINE WARM SECTOR CHARACTERIZED BY MIXED-LAYER CAPE
   AROUND 1500 J/KG AND DEWPOINTS RANGING FROM THE MID 50S TO LOW
   60S...THERMODYNAMICS REMAIN SUFFICIENT FOR VIGOROUS CONVECTION.
   
   FURTHER...WITH SELY BOUNDARY-LAYER FLOW ACROSS MUCH OF THIS AREA
   VEERING/INCREASING WITH HEIGHT TO SWLY AT 60 TO 70 KT AT MID
   LEVELS...SHEAR WILL CONTINUE TO SUPPORT LONG-LIVED/SUPERCELL STORMS
   -- AND ASSOCIATED THREAT FOR ISOLATED TORNADOES.  
   
   WHILE SEVERAL ISOLATED/ROTATING CELLS PERSIST...A TREND TOWARD A
   MORE LINEAR ORGANIZATION WITH TIME MAY OCCUR...AS THE COLD FRONT
   MOVING QUICKLY EWD ACROSS CENTRAL OK EVENTUALLY OVERTAKES THE
   DRYLINE.  DAMAGING WIND POTENTIAL WOULD LIKELY INCREASE IN THIS
   SCENARIO.
   
   ..GOSS.. 04/09/2009
   
   
   ATTN...WFO...LZK...SGF...SHV...EAX...TSA...TOP...ICT...FWD...
   OUN...
   
   LAT...LON   33759571 34429614 36109563 37649640 37919723 38349661
               38129385 36399368 34009406 33759571