A significant storm is approaching the West Coast, bringing with it the alarming meteorological phenomenon known as a bomb cyclone. This term, often used by weather enthusiasts, refers to the rapid intensification of a cyclone, a process more scientifically termed bombogenesis. This occurs when conflicting air masses interact, particularly when a cold air mass meets a warm one, which is common over ocean waters.
A bomb cyclone is characterized by a sharp drop in atmospheric pressure—specifically, a decrease of 24 millibars or more within a 24-hour period. The National Oceanic and Atmospheric Administration (NOAA) explains that these storms can form not just on the West Coast but across various regions globally, including the Northwest Pacific and North Atlantic.
This week, the National Weather Service has warned of excessive rainfall from Tuesday through Friday as the storm makes its way towards northern California and the Pacific Northwest. Current conditions contributing to this storm include an atmospheric river, which is a concentrated band of moisture flowing over the Pacific Ocean. The storm’s rapid intensification meets the criteria for classification as a bomb cyclone.
The impending storm is expected to bring heavy rainfall, posing risks of flash flooding and winter storm conditions in higher elevations. Furthermore, high winds may lead to hazardous travel and potential power outages, with damage to trees and infrastructure also a concern.
Bomb cyclones have been observed across the U.S. in recent years, with notable events including Hurricane Milton, a Category 3 hurricane that impacted Florida last month, and a 2018 bomb cyclone that caused extensive snow and near-hurricane force winds in the Southeast.
Despite the potential threat, it is important to remain informed and prepared. Meteorological advancements continue to improve our understanding and tracking of these storms, enabling communities to better respond to such severe weather events. While the anticipation of a bomb cyclone can be daunting, the situation also underscores the resilience and preparedness of communities in the face of natural disasters.