From the National Weather Service "forecast discussion" group:
WRAP AROUND CIRCULATION IS STRONGER AND WILL PULL DOWN MUCH COLDERAIR INTO NORTHWEST MIDDLE TENNESSEE AFTER MIDNIGHT. WIND SPEEDS WILLINCREASE. TEMPERATURES PROFILES ARE COLD ENOUGH FOR CHANGE TO SNOWACROSS MOST OF MIDDLE TENNESSEE BY 04/12Z. THERE COULD BE SOME LIGHTSNOW ACCUMULATIONS IN NORTHWEST MIDDLE TENNESSEE TONIGHT...POSSIBLY
GETTING INTO THE NORTH/WEST METRO NASHVILLE AREA TOO.
00Z GFS80 AND 06Z NAM12 IN BETTER AGREEMENT WITH -8 TO -10 C H8 AIR
MOVING OVER MIDDLE TENNESSEE ON SATURDAY...WITH MORE MOISTURE
HANGING BACK NEAR THE TENNESSEE RIVER INTO THE AFTERNOON. SNOW
SHOWERS ARE EXPECTED TO CONTINUE INTO THE DAY...MAINLY NORTH
AND EAST MIDDLE TENNESSEE. THE NORTHERN CUMBERLAND PLATEAU COULDRECEIVE UP TO THREE INCHES OF SNOWFALL INTO SATURDAY NIGHT.
.LONG TERM (MONDAY THROUGH THURSDAY)...COLD PATTERN CONTINUES AS ADVERTISED. THE NEXT CHANCE OFPRECIPITATION COMES SUNDAY NIGHT INTO MONDAY. MODELS SHOW LARGE
DIFFERENCES WITH TRACK OF SURFACE LOW ASSOCIATED WITH CLIPPER
SYSTEM...AND WILL CONTINUE CHANCE OF RAIN OR SNOW MOST AREAS. THENANOTHER SYSTEM WITH REINFORCING COLD AIR MAY BRING ANOTHER CHANCE OFSNOW TO THE REGION AT MIDWEEK.
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