Revised 2:01 p.m. Nov. 20

Johnson Street in Gouverneur is hit by a whiteout on Tuesday. when St. Lawrence County Sheriff Kevin Wells urged motorists to stay off the roads in the southern portions of the county. Photo submitted by Ashley Brothers.

A lake-effect snow warning remains in effect until 4 a.m. for southern St. Lawrence County, where as much as a foot of snow, and maybe even more, could accumulate by Friday.

The National Weather Service is especially cautioning residents and travelers south and east of US Rt. 11 in Gouverneur-Star Lake area, with a forecast of heavy snowfall and blowing snow. Snowfall rates there could reach two inches an hour this evening.

The conditions prompted St. Lawrence County Emergency Services to warn motorists of the hazards and to advise no non-emergency travel again today in the south of the county.

Six to eight inches of snow had already fallen from the lake effect snow band in the Fowler and Gouverneur area this morning as the band was shifting slowly east across southeast St. Lawrence County.

The NWS forecast for the Gouverneur area, revised at 1 p.m., said total daytime accumulations there could amount to six to 10 inches, with more snow overnight.

In the Star Lake area, there has been less snowfall today – amounting to four to eight inches by the end of the day, the NWS says –but another three to seven inches could add to that tonight.

As a result, hazardous travel is expected with snow-covered roads, blowing snow, and significantly reduced visibilities in winds from the southwest at 5 to 15 mph with gusts up to 30 mph. Visibilities could vary greatly in the area, and could drop to zero without notice, the NWS said.

Here is a sampling for forecasts in St. Lawrence County:

GOUVERNEUR

• This Afternoon: A 30 percent chance of snow showers, mainly before 3pm. Cloudy, with a high near 31. Southwest wind 10 to 13 mph, with gusts as high as 23 mph. Total daytime snow accumulation of 6 to 10 inches possible.

• Tonight: A 40 percent chance of snow showers, mainly between 9pm and 3am. Mostly cloudy, with a low around 13. Southwest wind 7 to 9 mph. New snow accumulation of around an inch possible.

• Friday: A 20 percent chance of snow showers, mainly between 8am and 9am. Partly sunny, with a high near 24. West wind 7 to 11 mph.

• Friday Night: Partly cloudy, with a low around 11. South wind 5 to 7 mph.

• Saturday: A chance of snow showers after 3pm, mixing with rain after 4pm. Partly sunny, with a high near 36. Southwest wind 13 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

• Saturday Night: A chance of snow showers before 7pm, then a chance of rain and snow showers between 7pm and midnight, then a chance of rain showers after midnight. Cloudy, with a low around 34. South wind 13 to 15 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

• Sunday: A 30 percent chance of showers. Mostly cloudy, with a high near 43. Southwest wind 7 to 11 mph.

• Sunday Night: Showers likely. Cloudy, with a low around 41. Southeast wind 8 to 15 mph. Chance of precipitation is 60%.

• Monday: A 50 percent chance of showers. Mostly cloudy, with a high near 56. South wind 11 to 16 mph.

• Monday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 41. Southwest wind 11 to 13 mph.

• Tuesday: A 40 percent chance of showers. Mostly cloudy, with a high near 45. Southwest wind 11 to 16 mph.

• Tuesday Night: A chance of rain and snow showers. Mostly cloudy, with a low around 31. Southwest wind 9 to 11 mph. Chance of precipitation is 40%.

• Wednesday: A chance of rain and snow showers. Mostly cloudy, with a high near 39. Southwest wind 7 to 9 mph. Chance of precipitation is 40%.

CANTON

• This Afternoon: A 20 percent chance of snow showers before 4pm. Mostly cloudy, with a high near 29. Southwest wind 13 to 15 mph, with gusts as high as 26 mph.

• Tonight: A 30 percent chance of snow showers, mainly between 10pm and midnight. Mostly cloudy, with a low around 15. Southwest wind 7 to 10 mph. New snow accumulation of less than a half inch possible.

• Friday: Partly sunny, with a high near 23. Southwest wind 8 to 11 mph.

• Friday Night: Partly cloudy, with a low around 13. South wind 3 to 7 mph.

• Saturday: A chance of rain and snow showers after 4pm. Partly sunny, with a high near 35. Southwest wind 8 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

• Saturday Night: A chance of snow showers before 8pm, then a chance of rain and snow showers between 8pm and midnight, then a chance of rain showers after midnight. Cloudy, with a low around 34. Southwest wind around 15 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

• Sunday: A 30 percent chance of showers. Mostly cloudy, with a high near 43. Southwest wind 8 to 11 mph.

• Sunday Night: Showers likely. Cloudy, with a low around 40. Southeast wind 8 to 11 mph. Chance of precipitation is 60%.

• Monday: A 50 percent chance of showers. Mostly cloudy, with a high near 55. South wind 10 to 14 mph.

• Monday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 41. Southwest wind 11 to 13 mph.

• Tuesday: A 40 percent chance of showers. Mostly cloudy, with a high near 46. Southwest wind 11 to 16 mph.

• Tuesday Night: A chance of rain and snow showers. Mostly cloudy, with a low around 31. Southwest wind 9 to 11 mph. Chance of precipitation is 30%.

• Wednesday: A chance of rain and snow showers. Mostly cloudy, with a high near 39. Southwest wind 8 to 10 mph. Chance of precipitation is 30%.

OGDENSBURG

• This Afternoon: Partly sunny, with a high near 32. Southwest wind 13 to 16 mph, with gusts as high as 28 mph.

• Tonight: A slight chance of snow showers between 9pm and 4am. Mostly cloudy, with a low around 17. Southwest wind 7 to 13 mph. Chance of precipitation is 20%.

• Friday: Partly sunny, with a high near 25. Northwest wind 7 to 10 mph becoming southwest in the afternoon.

• Friday Night: Partly cloudy, with a low around 15. South wind 3 to 6 mph.

• Saturday: A chance of rain and snow showers after 4pm. Partly sunny, with a high near 36. Southwest wind 8 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

• Saturday Night: A chance of rain and snow showers before 10pm, then a chance of rain showers. Cloudy, with a low around 35. Southwest wind around 15 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

• Sunday: A 30 percent chance of showers. Mostly cloudy, with a high near 44. Southwest wind 7 to 11 mph.

• Sunday Night: Showers likely. Cloudy, with a low around 40. Southeast wind 7 to 11 mph. Chance of precipitation is 70%.

• Monday: A 50 percent chance of showers. Mostly cloudy, with a high near 56. South wind around 14 mph.

• Monday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 41. Southwest wind 11 to 13 mph.

• Tuesday: A 30 percent chance of showers. Mostly cloudy, with a high near 46. Southwest wind 11 to 17 mph.

• Tuesday Night: A chance of rain and snow showers. Mostly cloudy, with a low around 32. Southwest wind 9 to 13 mph. Chance of precipitation is 30%.

• Wednesday: A chance of rain and snow showers. Mostly cloudy, with a high near 40. Southwest wind 8 to 10 mph. Chance of precipitation is 30%.

To keep an eye on weather developments, check out the NorthCountryNow.com weather page.