There's a good chance of snow tonight and tomorrow to complicate Thanksgiving travel plans for St. Lawrence County residents.

A hazardous weather outlook has been posted for southern parts of the county, from Gouverneur to the Cranberry Lake area, warning of one to four inches of snow accumulation there, while lesser amounts are expected to the north, the National Weather Service predicts.

A nor’easter moving along the mid-Atlantic coast is bringing snow to the North Country. Wet snow will develop across much of northern New York this afternoon.

Slow travel conditions due to slick snow-covered roadways and low visibility in falling snow can be expected this afternoon and tonight.

The snow is expected to end by daybreak on Thanksgiving morning, and mostly dry and seasonably cold conditions will follow through Friday.

The National Weather Service puts the chance of snow this afternoon at 60 percent in Star Lake and 30 percent in Potsdam and Massena. That rises to 60 percent tonight in the central and northern areas of the county, 70 percent in the south.

High temperatures today and tomorrow will be 30 to 35. Lows tonight will be around 20, and a little colder Thursday night.

Friday and Saturday, mostly cloudy conditions are expected.

The NWS forecast for the St. Lawrence Valley and northwestern Adirondacks:

• This Afternoon: A 30 to 60 percent chance of snow, mainly after 3pm. Cloudy, with a high 30 to 35. Calm wind becoming north 5 to 7 mph. Total daytime snow accumulation of less than a half inch possible, more in higher elevations.

• Tonight: Snow likely, mainly between 7pm and midnight. The snow could be heavy at times. Cloudy, with a low around 24. North wind 5 to 7 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible, more in higher elevations.

• Thanksgiving Day: A slight chance of snow showers before 8am, then a slight chance of snow showers after 10am. Mostly cloudy, with a high near 32. North wind 3 to 7 mph. Chance of precipitation is 20%.

• Thursday Night: Cloudy, with a low around 19. Northwest wind around 6 mph becoming light and variable in the evening.

• Friday: Partly sunny, with a high near 31. West wind around 6 mph.

• Friday Night: Mostly cloudy, with a low around 25. South wind around 6 mph.

• Saturday: Mostly cloudy, with a high near 36. South wind 6 to 10 mph.

• Saturday Night: A chance of rain and snow showers. Cloudy, with a low around 31. South wind around 9 mph. Chance of precipitation is 30%.

• Sunday: A 30 percent chance of showers. Cloudy, with a high near 45. South wind around 9 mph.

• Sunday Night: A chance of rain and snow showers. Mostly cloudy, with a low around 26. West wind around 7 mph. Chance of precipitation is 30%.

• Monday: A 30 percent chance of snow showers. Partly sunny, with a high near 32. Northwest wind 7 to 9 mph.

• Monday Night: Partly cloudy, with a low around 17. West wind 3 to 7 mph.

• Tuesday: Mostly sunny, with a high near 30. Light and variable wind.