St. Lawrence County is under a winter weather advisory through 7 p.m. today as periods of moderate to heavy snow are expected today, according to the National Weather Service (NWS).

Forecasters say snow may become heavy at times and road will likely be slippery.

Drive slow and allow extra time when traveling, the service says.

There will be a high temp today around 22 with 3-5 inches of snow possible, NWS says. Overnight the low will be near zero.

The forecast through next Saturday is as follows:

Monday

Sunny, with a high near 15. Wind chill values as low as -8. Calm wind becoming west around 5 mph.

Monday Night

Mostly clear, with a low around 5. Wind chill values as low as -2. Calm wind becoming south around 6 mph after midnight.

Tuesday

Partly sunny, with a high near 32. Southwest wind 9 to 13 mph.

Tuesday Night

Mostly cloudy, with a low around 23. South wind 7 to 10 mph.

Wednesday

Mostly cloudy, with a high near 39. South wind 7 to 10 mph.

Wednesday Night

A chance of rain showers before 7pm, then a chance of rain and snow showers between 7pm and 1am, then a chance of snow showers after 1am. Mostly cloudy, with a low around 25. South wind 8 to 14 mph. Chance of precipitation is 50%.

Thursday

Mostly cloudy, with a high near 31. Southwest wind 13 to 16 mph.

Thursday Night

A 30 percent chance of snow showers after 1am. Mostly cloudy, with a low around 12. West wind 5 to 9 mph becoming light after midnight.

Friday

A 30 percent chance of snow showers. Mostly cloudy, with a high near 21. Calm wind becoming northwest 5 to 9 mph in the afternoon.

Friday Night

Partly cloudy, with a low around 1. West wind 5 to 9 mph.

Saturday

Mostly sunny, with a high near 23. Southwest wind 3 to 5 mph.