(WPXI) – Colder air is back in place and will stay through Wednesday. Highs will be near average, in the mid- to upper 30’s. A Winter Weather Advisory will be in effect from 7 p.m. Wednesday to 4 a.m. Thursday for Allegheny, Beaver, Lawrence, Allegheny, Westmoreland, and Washington counties. The advisory will last until 10 a.m. Thursday for Armstrong and Butler counties. An Ice Storm Warning is in effect from 7 p.m. Wednesday to noon Thursday for the ridges of Fayette, Indiana and Westmoreland counties. Up to an inch of snow is possible during this system before it changes to freezing rain which could lead to hazardous driving conditions, damage power lines and trees and lead to power outages, especially in the higher elevations. Ice accumulation in the areas under the advisory could receive one-tenth to two-tenths of an inch. This midweek system will move Wednesday evening, with the chance for a little snow in spots in the afternoon. More of a wintry mix of sleet and freezing rain will develop Wednesday evening and continue through the overnight hours. This system will bring icy conditions to our area and impact travel from Wednesday evening into Thursday morning. Thunder is also possible early Thursday morning as freezing rain turns to rain with rising temperatures from the 30’s to the 40’s in the morning then to the 50’s by the afternoon. Areas not in the advisory could see a glaze of ice and this will impact travel. Make sure to use caution and check the forecast often ahead of this storm. (Photo: AP)