MESOSCALE DISCUSSION 2171
   NWS STORM PREDICTION CENTER NORMAN OK
   0425 AM CST SAT DEC 01 2007
   
   AREAS AFFECTED...PARTS WEST CENTRAL KS
   
   CONCERNING...FREEZING RAIN 
   
   VALID 011025Z - 011330Z
   
   A SHORT DURATION OF FREEZING RAIN WITH RATES UP TO 0.05 INCH IN A 3
   HOUR PERIOD WILL BE POSSIBLE ACROSS PART OF WEST CENTRAL KS FROM
   GREELEY/WICHITA COUNTIES TO ELLIS/GRAHAM COUNTIES...WITH LIGHTER
   AMOUNTS FROM PARTS OF SCOTT TO RUSH COUNTIES.  FREEZING RAIN SHOULD
   BEGIN BY 12Z...AND THEN END BY MID MORNING AS SURFACE TEMPERATURES
   RISE ABOVE 32 F.
   
   SURFACE OBSERVATIONS DURING THE LAST 1-2 HOURS ACROSS SW INTO WEST
   CENTRAL KS HAVE SHOWN INCREASING SURFACE DEWPOINTS INTO THE
   MID-UPPER 20S WHILE SURFACE TEMPERATURES HAVE HOVERED AROUND THE
   29-31 F RANGE.  RECENT OBSERVATIONS INDICATED LIGHT PRECIPITATION
   DEVELOPING ACROSS PARTS OF SW KS.  THIS TREND IS EXPECTED TO
   CONTINUE AND EXPAND ACROSS WEST CENTRAL KS WITH SOME INCREASE IN
   PRECIPITATION RATES AS LARGE SCALE ASCENT EVIDENT IN AREA OF COOLING
   CLOUD TOPS SPREADING EWD INTO THE CENTRAL PLAINS.  FORECAST MODELS
   AGREE THAT AS THE CO SURFACE LOW CONTINUES TO DEEPEN AND MOVE TOWARD
   ERN CO BY EARLY AFTERNOON...SURFACE WINDS ACROSS MUCH OF KS WILL
   VEER TO SLY AND COMBINED WITH STRONG LOW LEVEL WAA RESULT IN RISING
   SURFACE TEMPERATURES.  THUS...FREEZING RAIN EVENT ACROSS THIS PART
   OF W CENTRAL KS IS EXPECTED TO BE OF SHORT DURATION.
   
   ..PETERS.. 12/01/2007
   
   
   ...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...GID...DDC...GLD...
   
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