Thursday, December 18, 2014

Potential Christmas Eve storm Ontario & Quebec

Wrapping up the snow clearing operation on L'Ile Perrot from last weeks storm. (ValleyWX Photo)
This dreary, soupy weather we have been in for at least a week has become rather tiring. The last week has seen low clouds, fog, light precipitation and temperatures hovering around 0C (32F) all the time here in Montreal. This morning is no different with a current reading of, you guessed it, 0C. We will remain steady there today into tonight as low pressure deepens in the Atlantic Ocean east of Nova Scotia. This system is producing quite a decent snowfall in Maine and New Brunswick with 15-20cm falling. The western edge of it is producing light snow across southern Quebec with 5-10cm for Sherbrooke and Quebec City and 2-4cm for Montreal. The snow should taper by noon for Montreal followed by cloudy skies. Temperatures will be a little cooler tonight under clearing skies with lows of -5C. Friday into Sunday should be partly cloudy with temperatures near -1C.

A pattern change looks likely for the week of Christmas across Ontario and Quebec. Much colder air is forecast to arrive by Boxing Day with the increasing potential for a major storm for Christmas Eve and Christmas Day. Some computer models have a very deep storm system over the central Great Lakes by next Wednesday producing heavy amounts of snow north and west of the track and mixed precipitation here in Montreal. It would be a very windy system as well. There remains lots of uncertainty with this forecast as to timing and location of specific precipitation, however with it being a busy travel week we need to put it out there early. Have a back up plan ready just in case, this applies to our entire region into Ontario and south into the Ohio Valley, New York and New England.

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