MESOSCALE DISCUSSION 2213
   NWS STORM PREDICTION CENTER NORMAN OK
   0630 AM CST WED DEC 12 2007
   
   AREAS AFFECTED...WRN AND NRN OK
   
   CONCERNING...FREEZING RAIN 
   
   VALID 121230Z - 121630Z
   
   A MIXTURE OF FREEZING RAIN AND SLEET WILL BE LIKELY WITH SHOWERS
   MOVING NEWD ACROSS WRN AND NRN OK THIS MORNING. PRECIPITATION RATES
   COULD REACH A TENTH OF AN INCH PER HOUR WITH THE HEAVIER SHOWERS.
   
   THE LATEST WATER VAPOR IMAGERY SHOWS AN UPPER-LEVEL LOW OVER SE AZ
   WITH SOUTHWEST FLOW IN PLACE ACROSS THE SRN PLAINS. A PLUME OF
   MID-LEVEL MOISTURE EXTENDS NNEWD ACROSS WCNTRL TX INTO SRN OK
   ASSOCIATED WITH A BAND OF STRONG FLOW IN THE 700 TO 500 MB LAYER.
   THIS IS LIKELY WHERE WARM ADVECTION IS OCCURRING WHICH COMBINED WITH
   STEEP MID-LEVEL LAPSE RATES SHOULD CONTINUE TO SUPPORT
   CONVECTIVE-TYPE SHOWERS ACROSS WRN AND NRN OK THIS MORNING. FREEZING
   RAIN AND SLEET WILL BE LIKELY WITH AREAS IN THE PATH OF THE HEAVIER
   SHOWERS RECEIVING PRECIPITATION RATES UP TO A TENTH OF AN INCH PER
   HOUR. THE FREEZING LINE SHOULD GRADUALLY MOVE NWWD THIS MORNING
   ALLOWING FOR A CHANGEOVER TO RAIN IN THE SERN FRINGE OF THE MD AREA.
   
   ..BROYLES.. 12/12/2007
   
   
   ...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...TSA...ICT...OUN...
   
   35439764 35009846 34619956 34769999 35399994 36269843
   36949753 37049699 36969664 36719645 36399650 36009683