Polar vortex: Ice floes

Ice floes fill the Hudson River as the New Jersey waterfront is seen at sunset on Jan. 9, 2014,  in New York City. A polar vortex descending from the Arctic caused the floes to form. <br><b>MORE:</b> <a href="http://www.latimes.com/nation/nationnow/la-na-nn-polar-vortex-freeze-midwest-20140106,0,4278247.story" target="_blank">What is a polar vortex and what is it so dangerous?</a>

( Afton Almaraz / Getty Images )

Ice floes fill the Hudson River as the New Jersey waterfront is seen at sunset on Jan. 9, 2014, in New York City. A polar vortex descending from the Arctic caused the floes to form.
MORE: What is a polar vortex and what is it so dangerous?

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