What is a bomb cyclone'? The weather term back in the spotlight as West Coast prepares for a storm
Briefly

A bomb cyclone is defined as a cyclone that experiences a rapid drop in atmospheric pressure of 24 millibars or more within just 24 hours, resulting from the combination of cold and warm air masses, mostly occurring over ocean waters.
Meteorologists point out that the term bomb cyclone is applied during the rapid intensification phase of cyclones and is often most prominently observed with hurricanes and Nor'easters.
A powerful storm, identified as a bomb cyclone, is set to impact the West Coast, particularly northern California and the Pacific Northwest, coinciding with an atmospheric river bringing excessive rainfall.
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