It’s official: the bomb cyclone is back.
The winter storm that the Weather Channel has dubbed “Riley” has been undergoing the rapid intensification process called “bombogenesis,” which means its central pressure is dropping quickly (an indicator of a storm’s strength).
In this case, the nor’easter still appears to be intensifying, but the central surface pressure of the storm system has already dropped by at least 24 millibars (mb) in 24 hours, which means it is undergoing bombogenesis (or “explosive bombogenesis”) and qualifies it as a weather bomb or bomb cyclone.
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