Latest clues to the long-range pattern

A high-latitude blocking pattern will continue to feed rounds of colder air farther south into southern Canada and the United States over the next couple of weeks. Compared to a week ago, there is little indication of a cross-polar flow of Arctic air with these air masses, and more of a continental air mass with some Pacific air thrown in as well, which still leads to widespread below-normal temperatures but nothing too crazy for the northern U.S. and southern Canada.

There will still be more opportunities for late-season snowfall across eastern Canada and of course through the Canadian Rockies with this pattern despite the drier-than-normal (seven-day average) look on the first two maps.

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