Snow begins around 4 on Saturday afternoon and continues through the evening. Snow from the mid-level low will end before 4 a.m. on Sunday, but lake effect snow will likely continue through Monday morning. The biggest impact from the weekend snow will occur from 5 p.m. on Saturday through around 6 a.m. on Sunday, with snow-covered roads possible.

Much of the area will see 3 to 5 inches of snow over the weekend. Some amounts could easily reach a half a foot south and east of Pittsburgh.

The first snowfall of the season hit Pittsburgh and Western Pennsylvania on Tuesday morning, blanketing the region with a several inches of snow, closing or delaying schools, and bringing out shovelers to start cleaning up.

Saturday is an Impact Day for snow in western Pennsylvania. A winter weather advisory and a winter storm warning have been issued by the National Weather Service. Between 2 and 4 inches is expected areawide, with locally higher amounts possible in the Laurel Highlands, according to the forecast by Pittsburgh's Action Weather.

The National Weather Service forecasts snow and gusty winds for Pittsburgh, with varying accumulations expected.