Winter Weather Advisory

...WINTRY MIX EXPECTED FOR CHRISTMAS DAY... .A STORM SYSTEM CENTERED OVER THE MISSISSIPPI VALLEY WILL SPREAD A MIXTURE OF SNOW...SLEET AND FREEZING RAIN INTO CENTRAL PENNSYLVANIA TODAY. PRECIPITATION SHOULD CHANGE TO RAIN LATE TODAY...AS TEMPERATURES INCH ABOVE THE FREEZING MARK. ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 5 PM EST THIS AFTERNOON... THE WINTER WEATHER ADVISORY IS NOW IN EFFECT UNTIL 5 PM EST THIS AFTERNOON. A WINTRY MIX OF EITHER SNOW...SLEET OR FREEZING RAIN WILL OVERSPREAD CENTRAL PENNSYLVANIA TODAY. THE ARRIVAL TIME OF THE MIXED PRECIPITATION WILL RANGE FROM AROUND 7 AM OVER SOUTHWEST PARTS OF THE REGION...NEAR SOMERSET...TO EARLY AFTERNOON AROUND WILLIAMSPORT. THE AREAS MOST SUSCEPTIBLE TO A PROLONGED PERIOD OF FROZEN PRECIPITATION WILL BE OVER THE HIGHER TERRAIN OF THE ALLEGHENY MOUNTAINS...FROM AROUND SOMERSET NORTHEAST THROUGH PHILIPSBURG AND COUDERSPORT. PRECIPITATION SHOULD CHANGE TO PLAIN RAIN ACROSS THE ENTIRE REGION BY LATE AFTERNOON...AS TEMPERATURES RISE ABOVE THE FREEZING MARK.