Tuesday, 11 March 2014

Winter Storm Warning for southern Quebec

This graphic is from the NWS in Burlington, Vermont, and gives you an idea of the extent of the heavy snow up to the US border. The amounts listed are in inches. Between 15-20cm (6-8 inches) of snow should fall in metro-Montreal with warnings now in effect for Wednesday.
An appetizer of wet snow fell late last evening and into the wee hours this Tuesday morning with around 3-5cm of new snow. It is a very mild morning here on L'Ile Perrot at plus 1C (33F). Enjoy it folks as we have a major winter snowstorm bearing down on the region Wednesday. Low pressure will come together across the Midwest today and move across the Ohio Valley and towards New York City. All the ingredients are coming together for a big storm to develop. Warm air will be in place initially but arctic air will pour in behind the system.

Snow is expected to begin Wednesday morning and become heavy in the afternoon in southern Quebec and Eastern Ontario. We may have rates of several centimetres per hour at the height of the storm. The St. Lawrence Valley can expect 15-20cm of snow with amounts of up to 30-40cm across the Eastern Townships, Beauce and Gaspe and into upstate New York and Vermont. Winter Storm Warnings are now in effect for metro Montreal and well as the entire length of the St. Lawrence Valley. Warnings extend into Ontario as well as Atlantic Canada and New England. Winds will increase in the afternoon, gusting up to 70km/h and with temperatures forecast to plummet to -10C by late in the day, blowing snow will become a problem. Travel will be very poor in all regions of extreme southern Quebec with low visibility and snow covered roads. If you plan to travel Wednesday, you may want to make alternate plans. The snow will only taper off early Thursday. Temperatures will be mild today around plus 3C. The low tonight will be -3C and with the onset of snow Wednesday, the temperature will drop to -10C by late in the day.

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