US National Weather Service says this 'once in a generation type event' has the power to turn deadly and is already breaking cold-weather records
The extreme cold weather hitting North America in the run-up to Christmas is due to a phenomenon called a"bomb cyclone".
This usually happens when a warm air mass collides with a cold one, according to the National Oceanic and Atmospheric Administration. What makes this storm extraordinary is just how fast the pressure dropped - 40 millibars in 24 hours, according to meteorologist Yann Amice of analysts Weather'n'co. The unprecedented nature of this storm comes from the intensity and extremity of its low temperatures, Mr Duchesne said.The storm has sparked a"polar vortex plunge" where a particularly cold air mass from the Arctic heads south toward the lower, warmer latitudes.
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