Monday, March 22, 2010

Winter returns

Winter has returned to southern Quebec with cool temperatures and nearly 5cm of wet snow on Sunday. Another storm is poised to affect the region later today followed by the coldest air of the month to end this week.

Low pressure over the Ohio Valley is forecast to move into southern New England by Tuesday morning. A warm front will lift northward to just south of the St. Lawrence Valley overnight. In advance of this storm heavy rain will develop across New England and move north into Ontario and Quebec. The rain may begin as a period of freezing rain in the St. Lawrence Valley and Montreal as northeast winds keep the temperatures at or just above 0C. On Tuesday strong northeast winds and heavy precipitation are forecast. This system will bring 25mm (1 inch) or so of precipitation falling either as rain or a mix here in Montreal. There is the possibility that some warnings may be required, especially for the regions north or Montreal and the Ottawa Valley.

This same system dumped heavy wet snow across the southern plains over the weekend and is producing heavy rains across Pennsylvania and Ohio. Over 50mm (2 inches) of rain is forecast for the water logged region of southern New England and metro New York where flood watches have been raised. More warnings may be required later today and I will post them as they are issued. Check back this afternoon for an update.

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