Supercells Breeding Witches Brew Of Storms And Tornadoes This Afternoon (video and pictures)
MESOSCALE DISCUSSION 0420 NWS STORM PREDICTION CENTER NORMAN OK 1225 PM CDT SUN APR 27 2014 AREAS AFFECTED...ERN OK...NERN TX THROUGH WRN AND CNTRL ARKANSAS CONCERNING...SEVERE POTENTIAL...WATCH LIKELY VALID 271725Z - 271930Z PROBABILITY OF WATCH ISSUANCE...95 PERCENT SUMMARY...THE ATMOSPHERE IS EXPECTED TO BECOME INCREASINGLY FAVORABLE FOR LONG TRACK SUPERCELLS CAPABLE OF TORNADOES...A FEW OF WHICH COULD BE STRONG BY MID-LATE AFTERNOON. LARGE HAIL AND DAMAGING WIND WILL ALSO BECOME LIKELY WITH THE STRONGER STORMS. MESOSCALE AND CONVECTIVE TRENDS WILL CONTINUE TO BE MONITORED...AND A TORNADO WATCH WILL LIKELY BE NEEDED BY 19Z-20Z. DISCUSSION...EARLY THIS AFTERNOON A PACIFIC COLD FRONT EXTENDS FROM ERN KS SWD THROUGH CNTRL OK INTO NCNTRL TX. A WARM FRONT WAS LOCATED FROM NRN MS THROUGH CNTRL ARKANSAS. THE WARM SECTOR BETWEEN THESE BOUNDARIES CONTINUES TO DESTABILIZE AS A STRONG LLJ ADVECTS UPPER 60S DEWPOINTS NWD BENEATH STEEP LAPSE RATES. HOWEVER...THE RATE OF BOUNDARY LAYER DESTABILIZATION HAS BEEN SLOWED BY MULTILAYER CLOUDS INCLUDING STRATUS AND CONVECTIVE DEBRIS. LATEST VISIBLE IMAGERY DOES SHOW NUMEROUS CLOUD BREAKS...AND THE STRATUS DECK OVER CENTRAL ARKANSAS MAY EVENTUALLY ERODE FROM THE SOUTH. AN AXIS OF 1500-2500 J/KG MLCAPE WILL DEVELOP ACROSS THIS REGION THIS AFTERNOON. A PRE-FRONTAL BELT OF ASCENT WITH WHAT APPEARS TO BE AN EWD PROPAGATING GRAVITY WAVE CONTINUES FROM WRN ARKANSAS THROUGH NWRN TX. MEANWHILE AN UPPER JET STREAK ROTATING THROUGH BASE OF THE UPPER TROUGH WILL SHIFT EWD THROUGH NRN TX INTO THE LOWER MS VALLEY. FORCING FOR ASCENT ASSOCIATED WITH THESE FEATURES AS WELL AS BOUNDARY LAYER WARMING SHOULD EVENTUALLY WEAKEN THE CAP SUFFICIENTLY FOR SURFACE BASED THUNDERSTORM DEVELOPMENT WITHIN AXIS OF PRE-FRONTAL CONFLUENCE IN WARM SECTOR...AS WELL AS ALONG THE PACIFIC FRONT. STRENGTHENING WIND PROFILES ASSOCIATED WITH THE APPROACHING UPPER JET AND FAVORABLE LOW-LEVEL HODOGRAPHS WILL SUPPORT SUPERCELLS WITH LOW-LEVEL MESOCYCLONES CAPABLE OF PRODUCING TORNADOES AND LARGE HAIL. THE 0-1 KM HODOGRAPHS APPEAR MAXIMIZED ACROSS CNTRL AR WHERE LOW-LEVEL WINDS REMAIN BACKED IN VICINITY OF THE WARM FRONT THAT IS CURRENTLY BEING REINFORCED BY ELEVATED CONVECTION.
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