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One of several semi-permanent weather systems over the Earth, the polar vortex is an area of low pressure in the upper atmosphere that, on average in the Northern Hemisphere, typically has centers in two main areas: near Canada's Baffin Island, and over northeast Siberia.

The vortex is strongest in winter, thanks to an increased temperature contrast between the polar regions and the mid-latitudes, including the United States.
Polar Vortex Plunge Jan. 2014

A typical departure from average high temperature map you'll see in an Arctic outbreak in January. Blue shading denotes areas of colder than average temperatures. (Note: These are not actual temperatures, but how far below (negative numbers) average for early January temperatures are, in this case.)

Occasionally, the polar vortex can either be forced well south of its typical position, or a significant piece of the larger spin can break off and plunge south into the U.S.

In the case of this outbreak, a large piece of the vortex broke off and was forced well to the south over Ontario and the northern Great Lakes, as you can see in the animation at left (click the enlarge link for a bigger map).

Contributing to this southward buckling of the jet stream was a pronounced northward diversion of the polar jet stream over the eastern Pacific Ocean and West Coast of the U.S. To the east, or downstream of this northward diversion, or ridge of high pressure aloft, the polar vortex was forced southward.

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Originally posted by Niki2:
Nah, Sig, it's all a hoax, remember?

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Limbaugh: Media, Liberal Activists Ginning Up ‘Polar Vortex’ to Sell Global Warming ‘Hoax’

Rush Limbaugh isn’t buying into the “polar vortex” term being used in the media to describe the extreme cold all over the country right now, saying it’s just a hyperbole and a way for liberals to “attach this to the global warming agenda.”

He mocked the media coverage of the “vortex,” saying that the entire game is to make this sound “new and unprecedented” so blame entirely goes to humans, “particularly Republicans.” http://www.mediaite.com/online/limbaugh-media-liberal-activists-ginnin
g-up-polar-vortex-to-sell-global-warming-hoax/

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Yeah, hell, who needs that "science" bullshit anyway?

"Reminder: One snow storm disproves climate change but 30,000 firearm deaths means we need fewer gun laws.- LOLGOP"

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