NEWS
Arctic Air into Weekend in Canada
Doug Webster DTN Senior Ag Meteorologist
Thu Nov 21, 2013 11:08 AM CST

The weather pattern across North America has taken on what meteorologists call a positive Pacific North America pattern or positive PNA during the recent week. This means that an upper level ridge has developed across the coast of Western Canada, while a trough lies across central and Eastern Canada much of the time.

The result of a pattern like this is to block of any modifying influence of the mild Pacific to interior Western Canada and points east. With a now well-established snow cover across much of Canada and with long nights, temperatures can plummet quickly and have as we ...

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