What is the meteorological term for a hurricane that strengthens by at least 35 mph in 24 hours?

What is the meteorological term for a hurricane that strengthens by at least 35 mph in 24 hours? Rapid intensification. The term describes an unusually fast increase in a tropical cyclone's maximum sustained winds, conventionally defined in the Atlantic as an increase of at least 30 knots, or about 35 mph, within 24 hours.

Rapid intensification usually requires several favourable conditions at once. These include very warm ocean water, abundant moisture, low vertical wind shear, and good upper-level outflow that allows air to escape from the storm. When the inner eyewall organizes and pressure falls quickly, the cyclone can strengthen dramatically in a short period.

The phrase applies to tropical cyclones broadly, not only storms that have already reached hurricane strength. A tropical storm can undergo rapid intensification and become a major hurricane soon afterward. The process is difficult to predict because small changes in the storm's inner core can produce large changes in strength. It is not the same as bombogenesis, which refers to rapid pressure deepening in an extratropical cyclone, although the two concepts are sometimes confused.