MESOSCALE DISCUSSION 2068
   NWS STORM PREDICTION CENTER NORMAN OK
   0351 PM CST SAT DEC 26 2015

   AREAS AFFECTED...NORTH-CENTRAL AND NORTHEAST TX/SOUTH-CENTRAL INTO
   SOUTHEAST AND EAST-CENTRAL OK/WEST-CENTRAL AR

   CONCERNING...TORNADO WATCH 569...

   VALID 262151Z - 262345Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 569 CONTINUES.

   SUMMARY...THE THREAT FOR ADDITIONAL TORNADOES CONTINUES ACROSS MUCH
   OF WW 569 LATE THIS AFTERNOON INTO THE EARLY EVENING.  MEANWHILE...
   THE COLD FRONT HAS BEGUN TO MOVE INTO THE FAR WESTERN PART OF THE
   TORNADO WATCH UNDERCUTTING THE STORMS FROM JEFFERSON COUNTY OK TO
   STEPHENS COUNTY TX.  HAIL WILL BECOME THE PRIMARY THREAT WITH STORMS
   AS THEY ARE UNDERCUT BY THE EAST-SOUTHEASTWARD-ADVANCING COLD FRONT.

   DISCUSSION...HEIGHT FALLS INTO THE EARLY EVENING AHEAD OF THE
   DEEPENING SOUTHWEST STATES/NORTHERN MEXICO UPPER TROUGH WILL PROVIDE
   SUFFICIENT UPWARD VERTICAL MOTION FOR ADDITIONAL STORMS DEVELOPING
   ACROSS THE WARM SECTOR.

   THE 20Z SURFACE ANALYSIS INDICATED THE COLD FRONT HAS CONTINUED
   ADVANCING TO THE EAST/SOUTHEAST THIS AFTERNOON AND EXTENDED FROM
   NORTHEAST OK TO EAST AND SOUTH OF THE OKC METRO THROUGH GARVIN TO
   JEFFERSON COUNTIES OK...AND THROUGH MUCH OF WESTERN NORTH TX
   COUNTIES.  MEANWHILE...THE WARM SECTOR REMAINS QUITE MOIST AND
   MODERATELY UNSTABLE WITH SOME BREAKS IN THE CLOUDS HAVING FURTHER
   ENHANCED THE DEGREE OF INSTABILITY.  THIS DESTABILIZATION HAS EXPAND
   EAST ACROSS MORE OF EAST TX TOWARD THE ARKLATEX...RESULTING IN SOME
   EASTWARD EXPANSION OF WW 569 IN NORTHEAST TX.  TRENDS IN THE VWP
   DATA FROM CENTRAL TX TO EASTERN OK SHOWED STRENGTHENING SOUTHERLY
   WINDS OF 50-KT ATOP SOUTH-SOUTHEAST SURFACE WINDS...MAINTAINING
   STRONG LOW-LEVEL SHEAR FOR A CONTINUED TORNADO THREAT.

   ..PETERS.. 12/26/2015


   ATTN...WFO...LZK...SHV...TSA...HGX...FWD...OUN...EWX...SJT...

   LAT...LON   31489908 32339917 32979890 34179792 34449739 34869703
               35479647 35859611 35809490 35769318 35279336 34129414
               33259463 32359482 31529542 31129582 30419702 30779766
               30949843 31489908