A bomb cyclone is a large, intense midlatitude storm that has low pressure at its center, weather fronts and an array of associated weather, from blizzards to severe thunderstorms to heavy precipitation. It becomes a bomb when its central pressure decreases very quickly—by at least 24 millibars in 24 hours. Two famed meteorologists, Fred Sanders and John Gyakum, gave this pattern its name in a 1980 study.
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Source: Phys.org