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Mesoscale Discussion 443
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   MESOSCALE DISCUSSION 0443
   NWS STORM PREDICTION CENTER NORMAN OK
   0920 PM CDT FRI APR 24 2015

   AREAS AFFECTED...NERN TX...NRN LA...EXTREME SRN AR AND WCNTRL MS

   CONCERNING...TORNADO WATCH 100...103...

   VALID 250220Z - 250315Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 100...103...CONTINUES.

   SUMMARY...TORNADO WATCH 103 WILL BE REPLACED BY A NEW TORNADO WATCH
   PRIOR TO 0345Z THAT WILL INCLUDE NERN TX...EXTREME SRN AR...NRN LA
   AND WCNTRL MS.

   DISCUSSION...MCS REMAINS ORGANIZED ACROSS NERN TX AND IS EXPECTED TO
   CONTINUE EWD THROUGH SRN AR...NRN LA AND EVENTUALLY INTO WRN MS
   LATER TONIGHT. FORWARD PROPAGATION MAINTAINED BY A 50 KT SLY LLJ
   SHOULD SUSTAIN ACTIVITY NEXT FEW HOURS INTO THE LOWER MS VALLEY
   REGION. THOUGH THE DOMINANT MODE HAS TRANSITIONED TO LINEAR...A RISK
   FOR QLCS TORNADOES WILL CONTINUE. VWP FROM SHREVEPORT SHOWS AN
   IMPRESSIVE WIND PROFILE WITH 0-1 KM STORM RELATIVE HELICITY AROUND
   400 M2/S2 ALONG WITH 70 KT 0-6 KM SHEAR. TORNADOES ALSO REMAIN
   POSSIBLE WITH ANY DISCRETE STORMS THAT CAN ROOT IN THE NEAR SFC
   LAYER WITHIN WARM ADVECTION REGIME IN VICINITY OF WARM FRONT.

   ..DIAL/THOMPSON.. 04/25/2015


   ATTN...WFO...JAN...LZK...SHV...

   LAT...LON   33329387 33469230 33299057 32529047 32069100 31909221
               31819339 31799462 32489458 33329387 

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Page last modified: April 25, 2015
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