Niagara Falls partially frozen because of the cold temperatures continue to bring snow and ice across the US-Canada border. As a result, water continues to gush beneath the ice surface and through cracks in the ice. And a partial freeze like this is actually quite common, occurring most winter. Largely the result of ice from water sprayed from falling and landing on an "ice bridge" which gradually formed under the waterfall. The temperature dropped to -14 on Tuesday, while on Wednesday the wind chills dipped to -25F, WIVB.com reports.
Weather Prediction Center warned of "historic cold" throughout the eastern United States on Friday, when the polar vortex first this season due to arrive.
A forecast suggested on its website: "Get ready for even more impressive surge of Arctic air this weekend as another cold front drops south from Canada.
"There are indications that this could be some of the coldest weather since the mid-1990s to some parts of the US Southeast, Mid-Atlantic, and central Appalachians.
"An eddy of the polar vortex will increase the potential of the surface cold front, thus creating layers in the cold."
A polar vortex is a rotating pool of cold, dense air is held in place by strong winds.
One of the visitors to the waterfall is described as a beautiful scene, said: ". It's like the universe is bigger than us"
Another visitor added: "I feel like I lost my nose right now."
Michelle Blackley, communications and public relations manager for the fall, told USA Today: "Attention waterfall accept bring the crowd to see them in a magnificent, their winter splendor."