Thursday started off with a low of just 8 degrees at Philly International(it flirted with zero in the suburbs!), but once the sun rose we warmed up to a "balmy" 22 this afternoon; the irony was that we warmed to that 22 at 3:53pm with clouds around as some snow showers pushed through! The snow showers are associated with a fast moving clipper that reinforces another shot of Arctic air for Friday.
First things first as overnight Thursday night it will be clear and cold with lows in the upper single digits. This will lead to a very cold Friday with highs just in the upper teens, BUT with a northwest wind between 10-15mph the wind chill will be five to ten degrees below zero. Friday night temperatures will hold in the upper teens with increasing clouds as another clipper system works in from the west. This will lead to temperatures flirting with the freezing mark on Saturday with some light snow showers(with little accumulation).
On Sunday we'll get a southerly return as highs will get above freezing with late afternoon freezing rain to rain as temperatures rise overnight; the tricky part happens after Midnight once a cold front pushes through and reinforces the Arctic air. This means that temperatures around 40 or so at Midnight shall crash below freezing before sunrise so we can see rain changing over to snow with an inch or two of accumulation(that's just an idea right now and NOT a final forecast).
The Arctic air stays for most of the week with afternoon highs in the teens and overnight lows around zero. Don't forget that you can check out the rest of the seven day forecast any time at www.scottderekwx.com/forecast.html.