Snow advisories could spell trouble for commuters on both ends of Pennsylvania.
National Weather Service advisories for Pittsburgh and western Pennsylvania predict 1 to 2 inches in and around Pittsburgh, with 3 to 5 inches forecast for counties east and south of the city. A similar advisory is projecting 1 to 3 inches in and around Philadelphia.
But it's the timing of the advisories that could cause trouble.
The western advisory runs from noon Thursday until 7 a.m. Friday with snow possibly snarling the Thursday evening rush hour.
In eastern Pennsylvania, snow won't fall until Thursday night, but could hang on long enough to complicate things for commuters Friday morning.
More snow is forecast in lake-effect areas of northwestern Pennsylvania, and in mountains on both ends of the state.