High pressure will build across western Pennsylvania today. Scattered snow showers are possible through the morning hours, but then the snow showers will end with skies remaining mostly cloudy through this afternoon. High temperatures across the area will top out around 30 degrees.
Tonight will be partly cloudy with overnight lows in the mid 20s.
Saturday will be partly cloudy and warmer with highs reaching the mid 40s.
An arctic cold front will drop southeastward through the Great Lakes and across northwestern Pennsylvania Saturday night. This front will be accompanied by scattered snow showers and gusty winds. Temperatures will hover in the 30s ahead of the front, then drop to the 20s behind the front.
Sunday will be breezy and much colder with temperatures holding in the mid 20s. Snow showers are likely with some accumulation possible.
On Sunday night, a reinforcing shot of colder air will surge southeastward across the area. This will keep the lake effect snow going Sunday night and through the day on Monday. Lows Sunday night will fall to the low to mid teens, then rise to the upper teens for highs Monday afternoon.
The cold weather and lake effect snow showers will persist through the middle of next week.