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Mesoscale Discussion 391
MD 391 graphic
   
   MESOSCALE DISCUSSION 0391
   NWS STORM PREDICTION CENTER NORMAN OK
   1247 PM CDT TUE APR 20 2004
   
   AREAS AFFECTED...NERN OK...SERN KS
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 201747Z - 201915Z
   
   ...SEVERE THUNDERSTORMS SHOULD DEVELOP OVER PORTIONS OF SERN KS AND
   NERN OK BY LATE AFTERNOON...
   
   MULTIPLE LOW LEVEL BOUNDARIES ACROSS THE KS/OK REGION WILL INFLUENCE
   AFTERNOON/EVENING THUNDERSTORM DEVELOPMENT.  INITIAL CONVECTIVE
   OUTFLOW BOUNDARY FROM OVERNIGHT THUNDERSTORMS IS LOSING ITS IDENTITY
   ACROSS NRN OK THIS AFTERNOON WHILE STRONG HEATING ACROSS WRN OK INTO
   NCNTRL OK WILL ALLOW DRY LINE TO MIX EWD TO NEAR I-44 CORRIDOR BY
   LATE AFTERNOON.  IT APPEARS STRONGEST ZONE OF DEEP CONVERGENCE WILL
   PERSIST ACROSS NERN OK INTO SERN KS WHERE CONSIDERABLE LOW LEVEL
   CLOUDINESS AND MORE SLY LOW LEVEL COMPONENT WILL CONTINUE AHEAD OF
   WEAK SHORTWAVE TROUGH. SUSTAINED ASCENT OVER THIS REGION WILL PROVE
   ADEQUATE FOR THUNDERSTORM INITIATION BY 21Z NEAR OLD OUTFLOW/DRY
   LINE INTERSECTION...OR ALONG SEWD-MOVING SFC BOUNDARY ACROSS KS. 
   VERTICAL SHEAR PROFILES ARE MORE THAN ADEQUATE FOR STORM ROTATION
   WITH ISOLATED SUPERCELLS EXPECTED TO BE THE EARLY STORM MODE.
   
   ..DARROW.. 04/20/2004
   
   
   ATTN...WFO...SGF...TSA...ICT...OUN...
   
   37409747 37959575 37259451 36169470 35779599 36289790 
   
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