MESOSCALE DISCUSSION 0015
   NWS STORM PREDICTION CENTER NORMAN OK
   1113 AM CST MON JAN 05 2009
   
   AREAS AFFECTED...N CNTRL TX AND CNTRL/NERN AR...EXTREME WRN TN
   
   CONCERNING...FREEZING RAIN 
   
   VALID 051713Z - 052315Z
   
   PERIODS OF FREEZING RAIN WILL PERSIST THROUGH THE AFTERNOON HOURS
   WITH QPF RATES OF 0.05 TO 0.20 IN/HR. THE GREATEST ICE ACCUMULATION
   WILL BE OVER CNTRL AND NE AR.
   
   A BROAD ZONE OF PRECIPITATION PERSISTS ACROSS NRN TX INTO AR AND WRN
   TN DUE TO WARM ADVECTION ATOP A SURFACE HIGH. THIS SHIELD OF RAIN
   AND FREEZING RAIN WILL PERSIST FOR SEVERAL MORE HOURS...AND THE KEY
   FACTOR WILL BE SURFACE TEMPERATURES.
   
   AT 17Z...THE FREEZING LINE EXTENDED FROM WRN TN ACROSS CNTRL AR.
   NELY WINDS OF 10-15 MPH EXISTED ACROSS NE AR...HELPING TO KEEP COOL
   DRY AIR IN PLACE FROM ADVECTION. THE FREEZING LINE ACROSS CNTRL AR
   IS NOT EXPECTED TO MOVE MUCH DUE TO ADVECTION AS WELL AS
   EVAPORATIONAL COOLING...THUS AREAS OF SIGNIFICANT ICING WILL BE
   POSSIBLE.
   
   FARTHER SW INTO NRN TX...SUB-FREEZING AIR EXISTED AS WELL WITH
   FREEZING RAIN ONGOING ACROSS THE METROPLEX. GUIDANCE SUGGESTS THAT
   PERIODS OF FREEZING RAIN WILL PERSIST IN THIS AREA AS
   WELL...ALTHOUGH TEMPERATURES SHOULD SLOWLY RISE THROUGH THE DAY.
   
   ..JEWELL.. 01/05/2009
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
   SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
   TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
   FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
   
   ATTN...WFO...MEG...LZK...SHV...TSA...FWD...
   
   LAT...LON   35728941 34699079 34329215 34359310 34579397 33539608
               32169672 31949755 32079849 32409874 33159822 33629742
               33729650 33529608 34599394 35349288 35709119 35938958
               35968943 35858933 35728941