A big change in the weather this week… Parts of Pennsylvania, specifically, the western part of the state in and around the Pittsburgh area, could even see some snowflakes. The first snowflakes of the season could show up early Tuesday morning. If it does happen, the National Weather Service says it would tie the record for the earliest snowfall of the season in southwestern Pennsylvania. A freeze watch is in effect for portions of Pennsylvania, where in some areas temperatures will dip to around 30 degrees tonight.