Temperatures are taking the plunge around Pittsburgh this week, after 70-degree weather from this past weekend.
Some locations may even have ground-whitening snow showers through Christmas Eve. Folks heading out should be prepared for slippery spots and delays.
Temperatures will be 40 degrees lower Tuesday and Wednesday when compared to last Sunday with high temperatures forecast to be within a couple degrees of 30.
Mainly dry weather is forecast around Pittsburgh from Christmas Day through Sunday. There is a slight chance of snow around New Year's Eve.
The cold will stabilize late in the week, with temperatures bouncing back to within a few degrees of normal Thursday into Saturday.
The warmth this past weekend has erased temperature departures of several degrees below normal for December. As a result, December is likely to finish up close to the normal mean temperature of 33 degrees.
November finished 3.6 degrees below the normal mean temperature of 43 degrees around Pittsburgh.
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A magnitude-7.1 earthquake shook Mexico on Tuesday with the epicenter of the quake being located just southeast of Mexico City.
Rumors spread over the weekend that President Donald Trump will remain in the Paris Climate Agreement, in contrast to previous claims made by Trump that the United States would withdraw from the agreement.
Significant damage has been reported across Puerto Rico and the U.S. Virgin Islands as Hurricane Maria lashes the northern Caribbean islands.
Beyond Puerto Rico, Maria will have a direct hit on parts of the Bahamas and Turks and Caicos to end the week.
Beyond the Caribbean, Maria will take a path similar to Jose in the short term, but may still be a concern for part of the eastern United States, Atlantic Canada and Bermuda.
More than a month's worth of rain fell in Mumbai from Tuesday into Wednesday, causing widespread flooding and travel chaos.
A significant improvement in the weather is expected to begin on Thursday.
The cool, wet weather that has plagued much of the United Kingdom this month will continue this week.