A winter weather advisory is in effect for St. Lawrence County from 7 a.m. today through 7 p.m. on Saturday as heavy snowfall could create hazardous travel conditions as we head into the holiday weekend, according to the National Weather Service..

A very active weather pattern is expected across the North Country through Christmas Day with 3 to 7 inches of snow, sleet and freezing rain possible today through Saturday, forecasters say..

A widespread light to moderate snowfall today will transition to a wintry mix of snow, sleet,freezing, and rain on Saturday, before ending as a period of snow again Saturday night, forecasters say.

A wind chill value of -1 is expected today with northeast winds of 7 to 9 miles per hour, the service says.

Snow and sleet are expected early on Saturday before becoming all snow after noon, NWS says. Forecasters expect a high around 25 degrees on Saturday.

Cooler air will likely arrive for Christmas Eve and Christmas Day, the service says.

A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. Allow extra time if travel is necessary.

The forecast through Thursday is as follows:

Saturday

Snow and sleet, becoming all snow after noon. High near 25. Light and variable wind becoming south around 6 mph in the morning. Chance of precipitation is 100%. New snow and sleet accumulation of 1 to 2 inches possible.

Saturday Night

Snow likely before 11pm, then a chance of snow showers between 11pm and 2am. Mostly cloudy, with a low around 17. Southeast wind around 6 mph becoming west in the evening. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

Sunday

Mostly cloudy, with a high near 25. Southwest wind 5 to 7 mph becoming light and variable in the afternoon.

Sunday Night

Snow likely after 8pm. Cloudy, with a low around 13. Calm wind becoming northeast around 5 mph after midnight. Chance of precipitation is 60%.

Christmas Day

Snow likely before 2pm, then snow showers likely after 2pm. Mostly cloudy, with a high near 22. Light and variable wind becoming west 5 to 8 mph in the morning. Chance of precipitation is 60%.

Monday Night

Snow showers likely, mainly before 8pm. Mostly cloudy, with a low around 7. West wind around 8 mph. Chance of precipitation is 60%.

Tuesday

A 40 percent chance of snow showers. Partly sunny, with a high near 15. West wind around 7 mph.

Tuesday Night

A 30 percent chance of snow showers before 8pm. Mostly cloudy, with a low around -4. Northwest wind around 5 mph becoming calm in the evening.

Wednesday

Partly sunny and cold, with a high near 10. Light southwest wind.

Wednesday Night

Mostly cloudy, with a low around -8. Calm wind.

Thursday

Partly sunny and cold, with a high near 5. West wind 3 to 5 mph.