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Mesoscale Discussion 987
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   MESOSCALE DISCUSSION 0987
   NWS STORM PREDICTION CENTER NORMAN OK
   0249 PM CDT FRI MAY 23 2008
   
   AREAS AFFECTED...NERN PNHDL TX...CNTRL/ERN OK PNHDL AND EXTREME
   WCNTRL-NWRN OK
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 231949Z - 232145Z
   
   ISOLD TSTMS MAY INITIATE OVER THE CNTRL/ERN TX/OK PNHDLS 21-22Z AND
   COULD MOVE INTO EXTREME WCNTRL/NWRN OK THIS EVE.  A WW MAY BE
   REQUIRED.
   
   DEEP LAYER RIDGING HAS BEEN INCREASING OVER THE SRN PLAINS AS THE
   WCOAST TROUGH RETROGRADES.  BUT...A MID-LEVEL IMPULSE RIDING THE ERN
   RIM OF THE TROUGH WILL SKIRT PARTS OF THE SRN HIGH PLAINS THROUGH
   EARLY THIS EVENING.  PRIMARY MASS CONVERGENCE WILL LIKELY OCCUR
   ACROSS WRN/SWRN KS...BUT THERE IS A CONCERN FOR AT LEAST ISOLD TSTMS
   AS FAR S AS I-40 IN THE ERN TX PNHDL AND WCNTRL OK.  
   
   VSBL SATL ALREADY SHOWS A CU FIELD OVER THE DISCUSSION AREA...WITH
   DEEPER TOWERS TRYING TO ESTABLISH OVER TEXAS AND WRN BEAVER
   COUNTIES.  AIR MASS WAS STRONGLY UNSTABLE OWING TO ADVECTION OF MID
   60S DEW POINTS AND TEMPERATURES CLIMBING TO NEAR 90F.  THE DRYLINE
   CIRCULATION...ALREADY ENHANCING ACROSS SWRN KS...WILL LIKELY BECOME
   STRONGER FARTHER S INTO AT LEAST THE NERN TX PNHDL THROUGH LATE
   AFTN.  THIS IN COMBINATION WITH MAGNITUDE OF INSTABILITY AND
   WEAKENING CAP WILL PROBABLY LEAD TO INITIATION AFTER 21-22Z.  
   
   DEEP LAYER WIND PROFILES WILL BE SUPERCELLULAR AND VERY LARGE HAIL
   WILL BE LIKELY WITH ANY STORM.  FURTHERMORE...A SUSTAINED STORM
   MOVING NEWD TOWARD FAR NWRN/WCNTRL OK THIS EVENING MAY ALSO PRODUCE
   A TORNADO OR TWO AS SELY BOUNDARY LAYER FLOW REMAINS
   STOUT...BOOSTING 0-1KM SRH ABOVE 250 M2/S2 AMIDST LOW LCLS.
   
   ..RACY.. 05/23/2008
   
   
   ATTN...WFO...OUN...AMA...
   
   35970106 36520128 36890124 36960050 36979988 36919947
   36729920 36409920 35999930 35719950 35429976 35190008
   35170038 35390073 
   
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