Good afternoon. Pennsylvania. I'm Aaron Jolly. Folks, an arctic front crashed through overnight and left a gift behind. A big dome of Canadian high pressure sitting right on top of us. That's why you're stepping outside to blue skies and air that bites. Crisp. Clean. Cold. In the next 24 hours. Down in Southeast PA. Philly and the suburbs, you started the morning under clouds with a few rain and snow showers. Those are done now. Skies are clearing and you're sitting at 41 degrees. That's your high for the day, so don't expect a warm up. Tonight? The bottom drops out. Clear skies let all that heat escape. and you're waking up Monday to 20 degrees. Over in Western PA. Pittsburgh's been basking in sunshine all day. Highs right at 40 degrees with a north breeze around 9 miles an hour. Nothing dramatic. Tonight dips to 23 degrees under partly cloudy s ...