We were within seasonable territory on Friday with a high of 50 at Philly International; this was after a warm front pushed north, but took its sweet ol' time doing so. It was a cold morning with a low of 24 and it was under 40 degrees until about 1pm once the clouds pushes away.
Overnight we cloud up once again with lows in the upper 30s as a weak cold front pushes through; just some light rain is possible until sunrise, but then the clouds move out and we'll have sunshine by lunchtime with highs in the lower 60s. It's not until Sunday when we see some cooler air and highs just around 50.
There will be increasing clouds as a system will ride up from the south; this should mostly skirt by to our south and east, but provide some snow/sleet mix in the early morning hours into the day Monday. Temperatures at Midnight shall be in the upper 30s, but fall throughout the day. It's almost reminiscent of the March 3rd event with dry air from the north winning out and drying out the atmosphere; just looking at model guidance Friday afternoon there are a few issues such as drier air around 700 millibars(10,000 feet) early Monday morning and at 850 millibars(5000 feet) there is some milder air to cause sleet across southern areas. So those snowfall outputs you may have seen are also based off of 10:1 ratios, which wouldn't be the case in that point(much, much lower). When looking at the ensembles(the individual members that make up the run) it was about 50/50 with solutions for measurable snow vs. without measurable snow.
It shall be an interesting weekend ahead to see how this all evolves; Don't forget that you can check out the rest of the 7-day forecast(any time) at www.scottderekwx.com/forecast.html.