Persistent snowfall

A Winter Storm Warning goes into effect at 1 p.m. for counties south of Allegheny County, and a Winter Weather Advisory is in effect for Allegheny County and others to the north.

National Weather Service issues Winter Storm Warning
Earlier this week, the National Weather Service issued a Winter Storm Warning for parts of the Pittsburgh area along and south of I-70 for today and Sunday due to what they described as "a band of heavier snow."
As of Friday evening, nearly all of the Pittsburgh area is expected to see between two and four inches of snow.
In Pittsburgh, the estimate is 3-5 inches and 5-10 for the ridges.

Snow will be coupled with frigid temperatures
As the snow tapers off around midnight Sunday morning, it will remain scattered, but cold air will follow, leaving the low temperatures in the single digits, and the wind chill below zero as gusts could reach up to 15-20mph.

Road crews prepare for winter storm
Crews across western Pennsylvania say that they're prepared for the impending snowfall.
In Allegheny County, there are two dozen trucks and more than 9,000 tons of salt at the ready.
Even with the preparations, they're asking those who don't need to go out to stay off the roads in order to give them the space to clear them.

Snow covers Washington County highways
KDKA's Chilekasi Adele, reporting from South Strabane Township, Washington County, shares a firsthand view of how much snow one of Washington County's most-traveled roads got on Saturday.

PennDOT reduces speed limits for several area roadways
As the snow began to fall on Saturday, PennDOT announced it had reduced speed limits for several major roadways across the Pittsburgh area, including Interstates 70, 79 and 376.

PennDOT is urging drivers to avoid unnecessary travel, but for those who must head out, speeds have been reduced to 45 mph on the following highways:

Allegheny County
- Interstates 79, 376 (Parkways East and West), 279 (Parkway North), and 579
- Route 28

Beaver County
- Interstate 376 (Beaver Valley Expressway)

Lawrence County
- Interstate 376
- Interstate 79

Washington and Westmoreland counties
- Interstate 70

Greene and Washington counties
- Interstate 79

Additional speed restrictions on interstates and expressways may be implemented as the storm progresses.
Although roadways will continue to be treated, PennDOT says its goal is to keep roads passable. Roadways will not be completely free of ice and snow, officials say.
PennDOT will continue to treat roadways throughout the storm until precipitation stops and roads are clear.