What is a bomb cyclone?
Bomb cyclone is a term given to a rapidly strengthening storm that fulfills one important criterion.
• Generally, pressure must drop 24 millibars (a unit of pressure) within 24 hours.
• However, that benchmark is also based on the latitude of the storm. So, the millibar requirement can change depending on where the storm forms.
A bomb cyclone is simply a storm that intensifies very rapidly. Bomb cyclones form when the air near Earth’s surface rises quickly in the atmosphere, triggering a sudden drop in barometric pressure at least 24 millibars within 24 hours.
As the air rises, wind spirals in at the base of the storm. As long as the air continues to rise at the top of the storm faster than it can be replaced at the bottom, barometric pressure will continue to drop. As with a hurricane, lower air pressure yields a stronger storm.