A short-lived warmup is in the works for Pittsburgh before another shot of cold air arrives for the weekend.
Temperatures will rise by a few degrees each day through the second half of the week, reaching the mid-50s by Friday. Cloud cover will also increase with the rise in temperature.
Rain will move into the area on Friday, continuing until a cold front swings through on Friday night.
Temperatures will drop off significantly behind this front as a fresh blast of arctic air moves over the region.
Highs on Saturday will be limited to the mid-30s, but gusty winds will make it feel much colder with AccuWeather.com RealFeel® Temperatures in the upper teens.
Sunday will be even colder with highs in the 20s and AccuWeather.com RealFeel® Temperatures struggling to climb out of the single digits.
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.
Residents of Seattle and western Washington will want to keep rain gear handy as wet weather continues to move through the region.
Conditions will turn dry for San Francisco this weekend and last into next week.
New Haven, CT (1779)
First big snowstorm of "Hard Winter" - 17" at New Haven.
New York City (1917)
Central Park: -1 degrees, earliest zero reading.
Southern Illinois (1957)
A tornado tracked across Jackson, Williamson and Franklin counties, killing 11 people.