POTSDAM — A winter weather advisory for mixed precipitation in effect until 7 p.m. Saturday for northern and south-western St. Lawrence County, and the northern Adirondacks into Vermont, said the National Weather Service today.

Additional snow amounts of 1 to 3 inches and ice accumulation of up to fifteen hundredths of an inch, mainly in eastern and southern Vermont, is expected.

Difficult travel is expected into the holiday weekend.

The weather advisory region includes Massena, Malone, Ogdensburg, Potsdam,

and Gouverneur.

The National Weather Service says snow and mixed precipitation will be occurring throughout the day and drivers should plan on slippery road conditions. Three to 5 inches of snow fell on the region yesterday, and is expected to combine with some mixed precipitation and an

additional 1 to 3 inches of snow today to impact travel today.

Drivers should be prepared for reduced visibilities at times.

A Winter Weather Advisory means that periods of snow, sleet or freezing rain will cause travel difficulties, said the weather service. Be prepared for slippery roads and limited visibilities, and use caution while driving. Please allow extra time if travel is necessary.

The weather is expected to take a better turn Sunday with partly sunny conditions, and a high near 22.

Christmas Eve will see more snow, mainly after 8 p.m. and a low around 14. The chance of precipitation is 80 percent. New snow accumulation of 1 to 3 inches is possible.

Snow is likely on Christmas Day, mainly before 1 p.m. The skies will be cloudy, with a high near 22. The chance of precipitation is 70 percent. New snow accumulation of 1 to 2 inches is possible.