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it's suppose to be really cold next week

Remember the polar vortex? That weather pattern that sent temperatures plummeting across much of North America last winter, causing the Niagara Falls to partly freeze?

Well, it's back — sort of.

Forecasters say polar air from the Arctic Ocean is expected to arrive in Canada and the United States next week, bringing unseasonably cool temperatures to the eastern half of the country. Temperatures in Chicago will top out in the low 70s by midweek, making it seem like mid-September rather than mid-July. Compare Wednesday's forecasted high — 72 degrees — with the temperature on July 16, 2013: 93 degrees.

Similarly comfortable temperatures are expected as far south as Texas, part of what the National Oceanic and Atmospheric Association calls a "backward trajectory" of air.

According to the National Weather Service, temperatures could fall to about 20 degrees below normal in Kansas and Oklahoma.

The pattern "has been a recipe for extreme warmth on the West Coast and colder than average weather out East," Eric Holthaus, Slate's resident meteorologist, notes. "On the west side of the Rockies, tropical Pacific air gets funneled northward from around Hawaii toward Alaska while California dries out and roasts; on the other side, cold air from the Yukon cascades southward toward the Midwest and East Coast."

http://news.yahoo.co.....53514.html

seems that way over the last decade

how so? just not as many?