It occurs when the pressure of a storm drops at least 24 millibars in 24 hours.
As a major winter storm moves across the U.S. this week, it could undergo bombogenesis, or "bomb out," in the Midwest and the Plains.
Bombogenesis -- or a "bomb cyclone" -- occurs when the pressure of a storm drops at least 24 millibars in 24 hours. A millibar is a measure of atmospheric pressure inside a storm, telling meteorologists how strong or weak the storm system is. It usually happens when warm air rises ahead of an arctic air mass with a strong jet stream moving above it.
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