The polar vortex is an icy cap of air that usually swirls over the North Pole. "The cold air isn't pushing off anywhere, it's just sort of evaporating," said Brian Hurley, a meteorologist with the National Weather Service's Weather Prediction Centre in College Park, Maryland. Rocks and driftwood are seen at the frozen Lake Erie beach during the polar vortex in Buffalo, New York, US, Jan 31, 2019. More than 40 cold-temperature records were broken Thursday, the coldest morning since the polar vortex moved in late on Tuesday. The coldest recorded temperature was minus 56 in Cotton, Minnesota, on Thursday, the weather service said.

Source: bd News24 February 01, 2019 10:07 UTC