Northerly winds will drive cold air southward from Canada, then turn it eastward across the Midwest and into the Appalachians in stages through this week, including the Pittsburgh area.
After a brief rebound of warmth on Monday, additional waves of colder air will arrive on the scene over the balance of next week and will eventually push nighttime temperatures to near freezing with daytime highs in the 40s.
Each successive push of colder air will likely bring more wind as well, adding to the chill.
Along with the colder air for the region will come the first opportunities for snow of the season, or at least snowflakes.
There is a high chance of some of the white stuff accumulating over the Laurel Highlands during the second half of this week into the following weekend.
A couple dry days are in store for Atlanta, but will be followed by heavy rain in time for the weekend.
Despite a dry day Wednesday, clouds and rain will return to Seattle this week and next.
More waves of Arctic air are in the offing for Cleveland this week.
Yet another blast of Arctic air will roll southeastward this week over the Midwest and will reach the Northeast.
The coldest air of the season so far is moving in for the middle of this week around Connecticut, in the wake of Tuesday's snowstorm. A new storm will move in this weekend.
After ending the weekend on a slick note, more cold air will dominate weather headlines this week.
Madison, WI (1970)
16.0" snow, greatest 24 hour snowfall for city (10th-14th).
Baltimore City (1878)
28.73" barometric pressure - Dec. record.
Western New York (1995)
Heavy lake-effect snow brought 37.9" of snow to the Buffalo airport in 24 hours. This broke the old 24-hour record of 25.3" set in January 10-11, 1982. Other months included: Buffalo (Delaware Park) 33" Buffalo (Allentown) 33" Williamsville 32" Clarence 31" North Buffalo 27"