MESOSCALE DISCUSSION 0573
   NWS STORM PREDICTION CENTER NORMAN OK
   0549 PM CDT MON MAY 09 2016

   AREAS AFFECTED...SOUTH-CENTRAL/SOUTHEAST OK AND FAR NORTH TX TO AR

   CONCERNING...TORNADO WATCH 155...

   VALID 092249Z - 092345Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 155 CONTINUES.

   SUMMARY...ASIDE FROM LARGE HAIL...A TORNADO RISK WILL CONTINUE
   PARTICULARLY OVER THE NEXT 1-2 HOURS /POTENTIALLY THROUGH AT LEAST
   00-01Z/ ACROSS CENTRAL/SOUTH-CENTRAL OK INTO SOUTHEAST OK AND
   POSSIBLY EAST-CENTRAL OK. TORNADO WATCH 155 CONTINUES UNTIL 02Z/9PM
   CDT.

   DISCUSSION...FOUR DISTINCT SUPERCELLS ARE ONGOING ACROSS
   SOUTH-CENTRAL/CENTRAL OK ROUGHLY 35-40 MILES EAST OF I-35 AS OF 530
   PM CDT...WITH THE MOST PROMINENT SUPERCELL WITH A HISTORY OF A
   TORNADO AND HIGHER-END VELOCITY SIGNATURE CURRENTLY SHOWING A
   WEAKENING TREND ACROSS PONTOTOC COUNTY OK. AFTER INITIATING NEAR THE
   DRYLINE...THESE STORMS ARE LIKELY THRIVING IN A
   BAROCLINICITY/VORTICITY-RICH ENVIRONMENT AIDED BY EARLY-DAY
   PRECIPITATION/RESIDUAL CLOUD COVER. ENVIRONMENT 0-1 KM SRH IS LIKELY
   IN EXCESS OF 250 M2/S2 PARTICULARLY ACROSS SOUTH-CENTRAL/SOUTHEAST
   OK AS SUBSTANTIATED BY KTLX WSR-88D VWP DATA AND CONTEMPORARY
   MODIFICATIONS TO THE 18Z OBSERVED NORMAN SOUNDING. ACCORDINGLY...THE
   TORNADO THREAT SHOULD CONTINUE PARTICULARLY FROM SOUTH-CENTRAL INTO
   SOUTHEAST OK. THIS CORRIDOR IS OBSERVATIONALLY CONSISTENT WITH
   REGIONALLY MAXIMIZED PRESSURE FALLS...A CONTINUED TENDENCY FOR A
   BACKING OF LOW-LEVEL WINDS....AND WARMER AIR ACROSS FAR SOUTHEAST OK
   AND ADJACENT ARKLATEX /SOMEWHAT COOLER TEMPERATURES AND THICKER
   CLOUD COVER HAS PERSISTED ACROSS PARTS OF EAST-CENTRAL AND NORTHEAST
   OK/.

   ..GUYER.. 05/09/2016


   ATTN...WFO...LZK...SHV...TSA...FWD...OUN...

   LAT...LON   34679677 35559689 35729410 34749348 33479370 33359620
               33449664 34679677