Tuesday, November 29, 2011

Freezing rain north - cold rain south

Low pressure over Kentucky is forecast to move northeast across southern Ontario by late today and eventually east of Quebec by tomorrow. This morning light rain is falling in Montreal with chilly temperatures of 3C. It should warm to 6C today and increase further overnight tonight in the rain and mild southwest winds to about 12C. Rain will increase in intensity and coverage tonight as the main area of low pressure and associated cold front crosses the area. The slow moving storm is producing well above normal temperatures south and east of the center, however on the north and west side it is a different story. Cold air at the surface is allowing for freezing rain in a wide swath from central Ontario across the upper Ottawa Valley and north of Montreal from Pontiac to Quebec City. Warnings are in place for as much as 10-20mm of ice. This will cause serious road conditions and power outages. Keep this in mind if your travels take you north of Montreal or north and west of Ottawa today and tonight.

Further south snow is falling across northern Mississippi, Alabama and Tennessee. Snow will also fall on the backside of the system from Indiana and Illinois into Michigan and parts of Ontario. Up to 15cm (6 inches) of snow may follow the rain. Here in southern Quebec it will be mainly a rain event with up to 25mm (1 inch) possible tonight and Wednesday followed by perhaps a few snowflakes late in the day Wednesday as the temperatures tumbles to the freezing point. The balance of the week looks seasonable but unsettled with a few showers or flurries into the weekend. No big cold or snowstorms are in our future for Montreal at this time.

*** I have posted screen shot of my new weather system ValleyWX above. I installed it in the backyard last night and hopefully will make it available online shortly. I am just checking the equipment for reliability and accuracy at this time. In any event it will help me provide a more localized forecast for the southwestern suburbs of Montreal south to the US border and west to the Ontario border.

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