Live traffic cameras are showing a travel nightmare unfolding across western New York as extremely heavy lake-effect snow from Lake Erie pounds areas near and just south of Buffalo.

(MORE: Lake-Effect Radar, Forecast | Snow Shuts Schools, Roads)

New York State Police said an estimated 120 vehicles were stuck near the Lackawanna toll barrier on the New York State Thruway (Interstate 90) Tuesday morning. The Thruway is closed from Interchange 46 at Henrietta, near Rochester, to Interchange 61 near the New York-Pennsylvania state line.

Conditions are also worsening east of Lake Ontario. Authorities have closed all roads in Jefferson County, which includes Watertown, according to the Watertown Daily Times.

Below are current images from webcams throughout western New York. For more webcams, including over 1,000 cameras in New York state alone, check the Weather Webcams section of our sister website, Weather Underground.

As a sign of how localized lake-effect snow can be, take a look at this camera along Interstate 190 near Niagara Falls, New York -- just 20 miles north of the heavy snowband depicted in the images above.

MORE ON WEATHER.COM: Lake-Effect Snow Slams Great Lakes, Nov. 18, 2014