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Mesoscale Discussion 423
MD 423 graphic
   
   MESOSCALE DISCUSSION 0423
   NWS STORM PREDICTION CENTER NORMAN OK
   1010 PM CDT WED APR 21 2004
   
   AREAS AFFECTED...NERN OK/EXTREME SERN KS/SWRN MO AND NWRN AR
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 220310Z - 220445Z
   
   PORTIONS OF NERN OK...EXTREME SERN KS...SWRN MO AND NWRN AR ARE
   BEING MONITORED FOR A POSSIBLE SEVERE THUNDERSTORM WATCH IN THE NEXT
   1 TO 2 HOURS.
   
   ORGANIZED CLUSTER OF SEVERE STORMS ARE MOVING EWD AT 25 KT THROUGH
   NWRN OK. THESE STORMS APPARENTLY ARE BEING MAINTAINED BY SHORTWAVE
   TROUGH CURRENTLY MOVING INTO NWRN OK...WITH STRONG PRESSURE RISES
   LOCATED BEHIND STORMS EXTENDING BACK INTO SERN CO. ALTHOUGH BOUNDARY
   LAYER AIR MASS HAS BEEN WORKED OVER BY EARLIER CONVECTION...EVENING
   SOUNDINGS IN THE AREA SHOWED STEEP MID LEVEL LAPSE RATES...RESULTING
   IN MUCAPES AROUND 1000 J/KG. THIS INSTABILITY PLUS DEEP LAYER SHEAR
   OF 40-50 KT SHOULD MAINTAIN CONVECTION THROUGH THE NIGHT. IF IT
   APPEARS STORMS WILL BE TO MAINTAIN A SEVERE THREAT THROUGHOUT THE
   OVERNIGHT PERIOD...MAINLY LARGE HAIL...WW WOULD BECOME REQUIRED.
   
   ..IMY.. 04/22/2004
   
   
   ATTN...WFO...SGF...TSA...ICT...OUN...
   
   35569470 35849678 36969689 37239601 37309484 37129406
   36209379 
   
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