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Partially frozen Niagara Falls

The U.S. side of the Niagara Falls is pictured in Ontario, January 8, 2014. The frigid air and "polar vortex" that affected about 240 million people in the United States and southern Canada will depart during the second half of this week, and a far-reaching January thaw will begin, according to AccuWeather.com. (REUTERS/Aaron Harris)

Partially frozen Niagara Falls

Yahoo NewsJanuary 9, 2014

The polar vortex that has gripped the U.S. and Canada this week has led to some spectacular icy images. The latest come from Niagara Falls, which partially froze on Tuesday, when the high temperature was a record low of minus 2 degrees.

The ice formed on the U.S. side of the falls, which straddle the border between the United States and Canada.

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