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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