This weather phenomenon is expected to be the pressure equivalent of a category 2 hurricane as it reaches the Great Lakes, with the weather service now calling the strength of the low a “once-in-a-generation” event. That’s because of the extreme temperature difference between the warm and moist air in advance of the storm and the extreme Arctic air mass moving in from Canada. These storms frequently occur with winter nor’easters, but in this case, the bomb cyclone is expected to occur in the Plains. Specifically, it means a drop of 24 millibars (a term used to measure atmospheric pressure), in 24 hours. For millions of Americans across a large swath of the country, the holiday week is beginning with unrelenting below-freezing temperatures made even more miserable by heavy snow expected Tuesday and Wednesday in several central and northwestern states.Ī developing ‘bomb cyclone’ has prompted alerts from Washington state to Maryland that cover over 50 million people, according to the National Weather Service, and that number is expected to grow over the coming days.Ī ‘bomb cyclone’ is a term used by meteorologists to describe a rapidly strengthening storm.
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