Thursday, January 28, 2010

Arctic Boundary

Cold air is on our doorstep. The temperature currently is as warm as it will be for the next week or so. Radar is showing steady snow falling along a cold front moving across Ontario. Ahead of the front strong southwest winds are driving snow squalls off Lake Ontario and down the St. Lawrence Valley. The heaviest snow is falling in northern Jefferson and across St. Lawrence County in New York and into eastern Ontario along the 401 corridor from Kingston to Cornwall. Look for 15-25cm in those regions with a general 5-10cm in all other areas today. If you are traveling along the 401 today expect periods of snow, heavy at times with lots of blowing snow and reduced visibilities. Winter Weather Advisories and Special Weather Statements are posted for those areas. Locally the light snow will pick up and become quite heavy with the frontal passage, before tapering to flurries late tonight. Winds will increase as well out of the southwest and then back to the northwest tonight at speeds from 40-60km/h. The combination of falling and blowing snow will make travel poor this afternoon into early this evening. Once the front passes the temperature will fall to -16C overnight and remain nearly steady on Friday. Skies will eventually clear Friday but winds will make it very cold with wind chills approaching -30C across southwest Quebec and eastern Ontario. It will be a sunny and cold weekend.

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