A bomb cyclone is set apart by its rapid rate of intensification set off by plunging atmospheric pressure. Bomb cyclones occur when atmospheric pressure falls by at least 24 millibars (2,400 pascals, or 18 mm of mercury) per day at 60Β° latitude and about 17.8 millibars (1,780 pascals, or about 13.4 mm of mercury) or more per day at 40Β° latitude.
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