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Mesoscale Discussion 518
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   MESOSCALE DISCUSSION 0518
   NWS STORM PREDICTION CENTER NORMAN OK
   0610 PM CDT TUE MAY 11 2010
   
   AREAS AFFECTED...NWRN TX...WRN/CNTRL OK
   
   CONCERNING...TORNADO WATCH 151...
   
   VALID 112310Z - 120045Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 151 CONTINUES.
   
   WARM FRONT/MOISTURE SURGE IS RETREATING ACROSS WRN/CNTRL OK AT
   ROUGHLY 10-15KT AND CURRENTLY EXTENDS E-W JUST NORTH OF I-40.  THIS
   BOUNDARY SHOULD CONTINUE TO LIFT NWD DURING THE EVENING BECOMING
   ORIENTED OVER SRN KS LATE AS LLJ INCREASES ACROSS THE HIGH PLAINS IN
   RESPONSE TO APPROACHING TROUGH.
   
   SEVERAL ATTEMPTS AT SUSTAINED DEEP CONVECTION HAVE BEEN
   NOTED...PARTICULARLY OVER CLAY/JEFFERSON COUNTIES ALONG THE RED
   RIVER...AND ALONG THE RETREATING MOISTURE SURGE OVER BECKHAM COUNTY.
   THIS ACTIVITY HAS STRUGGLED...POSSIBLY DUE TO WEAK CAPPING. 
   HOWEVER...WITH STRENGTHENING LLJ JUST AFTER DARK THERE MAY BE A
   MARKED INCREASE IN NEAR-SFC BASED ACTIVITY BEFORE CONVECTION BECOMES
   MORE ELEVATED IN NATURE.  ADDITIONAL STORMS MAY ALSO DEVELOP
   DOWNSTREAM ALONG THE WARM FRONT ORIENTED ALONG I-44 INTO NERN OK. 
   WILL MONITOR THIS REGION AS WELL.
   
   ..DARROW.. 05/11/2010
   
   
   ATTN...WFO...OUN...AMA...
   
   LAT...LON   35979999 36079785 33919785 33829999 35979999 
   
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