Discussion
Which name is given to a cyclone deepening faster than 24 hectopascals in a day?
Answer: B
The bergeron criterion defines explosive cyclogenesis as a central pressure fall of 24 hectopascals in 24 hours adjusted for latitude, and such storms occur mainly over the western oceans in winter. Coupled jet streaks, strong baroclinicity and latent heat release all contribute. Secondary depressions, polar lows and cut-off lows are different phenomena with their own defining characteristics. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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