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Mesoscale Discussion 770
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   MESOSCALE DISCUSSION 0770
   NWS STORM PREDICTION CENTER NORMAN OK
   0515 PM CDT MON MAY 25 2015

   AREAS AFFECTED...EASTERN OK AND NORTHEAST/EAST-CENTRAL TX TO
   WESTERN/CENTRAL AR AND NORTHERN LA

   CONCERNING...TORNADO WATCH 212...

   VALID 252215Z - 252345Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 212 CONTINUES.

   SUMMARY...A SQUALL LINE WILL LIKELY CONTINUE TO ACCELERATE
   EAST-NORTHEASTWARD FROM EASTERN OK AND NORTHEAST/EAST-CENTRAL TX
   INTO AR/NORTHERN LA THROUGH EARLY/MID-EVENING. POTENTIALLY
   WIDESPREAD DAMAGING WINDS AND A TORNADO RISK WILL REMAIN CONCERNS
   WITHIN THIS CORRIDOR.

   A NEW TORNADO WATCH WILL LIKELY BE NEEDED SOON ESPECIALLY FOR
   WESTERN/CENTRAL AR AND NORTHERN LA. TORNADO WATCH 212 CONTINUES
   UNTIL 03Z.

   DISCUSSION...A HIGHLY ORGANIZED SQUALL LINE WITH EMBEDDED
   LEWPS/CIRCULATIONS  CONTINUES TO GRADUALLY ACCELERATE
   EAST-NORTHEASTWARD ACROSS FAR EAST-CENTRAL/SOUTHEAST OK AND
   NORTHEAST/EAST-CENTRAL TX AS OF 5PM CDT/22Z. POTENTIALLY WIDESPREAD
   DAMAGING WINDS WILL REMAIN A PREVALENT CONCERN. TORNADOES WILL ALSO
   REMAIN POSSIBLE WITH LINE-EMBEDDED MESOVORTICES AND SEMI-DISCRETE
   SUPERCELLS IMMEDIATELY AHEAD OF THE CONVECTIVE LINE. THIS SHOULD
   ESPECIALLY BE THE CASE ACROSS FAR EAST-CENTRAL/SOUTHEAST OK AND FAR
   NORTHEAST TX INTO WESTERN/CENTRAL AR...PARTICULARLY NEAR AN
   INFLECTION IN THE LINE NEARING THE OK AND AR BORDER VICINITY /AT
   22Z/ COINCIDENT WHERE SURFACE PRESSURE FALLS AND LOW-LEVEL
   SOUTHEASTERLY WINDS ARE MAXIMIZED. IT SHOULD ALSO BE NOTED THAT WARM
   SECTOR SHOWERS/THUNDERSTORMS CURRENTLY ONGOING WELL AHEAD OF THE
   SQUALL LINE ACROSS NORTHERN LA INTO SOUTHWEST/SOUTH-CENTRAL AR MAY
   INCREASINGLY ACQUIRE ROTATION AS LOW-LEVEL SOUTHERLY FLOW
   INCREASES...SUCH THAT AN INCREASING TORNADO RISK COULD OCCUR AHEAD
   OF THE SQUALL LINE.

   ..GUYER.. 05/25/2015


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

   LAT...LON   35349535 35679518 36289410 36299192 35309113 32409165
               31429302 31879526 33849508 35349535 

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Page last modified: May 25, 2015
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