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Bolaris: Huge temperature swing, then wintry mix

Get ready for the Tale of Two Seasons as we head into the first climatological winter weekend. After you wake up to some dreary conditions come Thursday morning (patchy drizzle & fog), temperatures will rise through the 50s into the low-to-mid 60s, but most shower activity will hold off until Thursday night as temps hold steady around 60.

For Friday's morning commute, you will be greeted by spring-like temperatures in the 60s, however, showers and possible thunderstorms will rock the area. Periods of rain will continue throughout the day and night on Friday as temperatures begin a dramatic cooldown.

The National Running of the Santas will kick off on Saturday as thousands of sexy and a few not-so-sexy Santas start the day at the South Pole (Finnigan's Wake) for a Hot Santa Run. Part of the proceeds will be going to specified charities in each city's local community.

Winter will make its comeback on Saturday as some leftover morning rain will give way to a blast of Arctic air, clearing out the skies but sending temperatures some 20 degrees colder than they were on Friday.

With cold air in place for Sunday a storm system sweeping in from the southwest will lead to a wintry mix of snow, sleet, freezing rain and rain to break out by midday on Sunday. Some roadways will ice up, generally North and West of the Blue Route. Sections of Bucks, Montgomery and Chester counties, and Mercer County in New Jersey, could see a light accumulation of snow and ice.

Philly will see a mix of sleet and some wet snow before a changeover to rain, as will Southern New Jersey and Delaware.