While the weekend started on a wet and mild note, drier air will work into Philadelphia for Sunday. Frigid air will not.
Until the rain departs Saturday evening, there is the potential for urban flooding and travel delays. Thunder and lightning may accompany the rain in some areas.
Temperatures will flirt with record high levels during the storm, especially Saturday evening.
In the wake of the storm, dry weather will end the weekend and it will turn cooler, but not colder immediately. This is because the source of the air moving in Sunday will be from the Pacific Ocean.
However, gusty winds could cause some delays at airports in the Northeast on Sunday.
Colder air will return in stages with the first not due in until Wednesday or Thursday. Before that, temperatures will rise to near the 50-degree mark both Monday and Tuesday.
AccuWeather.com Senior Meteorologist Kristina Pydynowski contributed to the content of this story.
A train of storms will continue to deliver rain to the Pacific Northwest with one particular storm this weekend likely to be the strongest of the bunch.
A major storm centered on Christmas Eve will affect the Midwest and East with strong winds, areas of heavy snow, wind-swept rain and thunderstorms.
With many winter storms lined up, snow will create a wintry setting for Christmas in some areas.
Several fast-moving storm systems will bring unsettled weather to the British Isles and northern Europe this week.
A potent cold front will bring much cooler air and a flood threat to parts of South America this weekend.
In a rare event late last week, visitors to Grand Canyon National Park were able to see fog roll into the canyon like a tide, blanketing the popular tourist attraction.
Las Vegas, NV (1984)
Trace of snow fell.
Mauna Kea, HI (1988)
Wind-driven snow and sleet led to evacuation of astronomical observatories.
New Haven, CT (1779)
First big snowstorm of "Hard Winter" - 17" at New Haven.