MESOSCALE DISCUSSION 0504
   NWS STORM PREDICTION CENTER NORMAN OK
   0519 PM CDT FRI APR 17 2009
   
   AREAS AFFECTED...PARTS OF SERN CO
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 172219Z - 172315Z
   
   ISOLD SEVERE THREAT...INCLUDING THE POTENTIAL FOR A BRIEF
   TORNADO...WILL BE POSSIBLE FOR THE NEXT FEW HRS.  AFTER COORDINATION
   WITH A LOCAL OFFICE...A WW WILL LIKELY NOT BE ISSUED DUE TO LIMITED
   AREAL EXTENT.
   
   22Z SURFACE ANALYSIS SHOWS A LEE SURFACE CYCLONE NEAR TAA WITH A
   DRYLINE/OCCLUDED FRONT DRAPED FROM 10 MI ESE PUB ARCING SEWD TO LAA.
    STEEP LOW LEVEL LAPSE RATES HAVE PROTRUDED NWWD INTO SERN CO
   BEHIND/S OF BOUNDARY WITH BACKED SELY TO NELY SURFACE FLOW
   IMMEDIATELY N OF BOUNDARY.  AMPLE AMBIENT LOW LEVEL VORTICITY INVOF
   OF BOUNDARY IS CO-LOCATED WITH SUFFICIENT 0-3 KM CAPE /100 J/KG/. 
   AS STRONGER SEMI-DISCRETE UPDRAFTS INTERACT WITH ENVIRONMENT
   IMMEDIATELY ADJACENT TO THE BOUNDARY...THEY MAY POSE A LIMITED/BRIEF
   TORNADO THREAT FOR THE NEXT HR OR TWO.  HOWEVER...ISOLD NATURE OF
   EXPECTED THREAT ALONG WITH LIMITED AREAL EXTENT PRECLUDES A WW
   ISSUANCE.
   
   ..SMITH.. 04/17/2009
   
   
   ATTN...WFO...GLD...PUB...BOU...
   
   LAT...LON   37910221 38470322 38460388 38550445 38710455 38880443
               39060335 38610230 38140208 37910221