Major bomb cyclone threatens the west coast with intense rain and wind
A powerful storm system expected to develop into a “bomb cyclone” is heading toward Northern California and southern Oregon, potentially bringing severe weather from Tuesday, November 19 through Thursday, November 21. Meteorologists have warned of extreme rain, high winds and significant snowfall at higher altitudes, raising concerns about flash flooding and other hazards in the region.
According to According to WeatherNation, the storm is expected to experience rapid pressure drops, a phenomenon called “bombogenesis.” The pressure is expected to drop from over 1,000 millibars on Monday evening to below 950 millibars on Tuesday evening. This sharp drop indicates a rapidly intensifying storm, confirmed by data from the National Oceanic and Atmospheric Administration (NOAA).
Key areas where serious consequences may occur
The University of California, San Diego has classified the impacts between the San Francisco Bay Area and Eureka, California, as “extreme.” Central Oregon to Salinas, California, will also likely experience significant impacts, including wind gusts up to 75 miles per hour and rainfall ranging from 2 to 4 inches per day. In higher elevations above 3,000 feet, snowfall could accumulate as high as 2 feet, adding to the storm’s challenges.
Atmospheric river and its dual role
The coming storm is powered by an atmospheric river, a weather pattern that draws tropical moisture north. While such systems are essential for providing 30% to 50% of the West Coast’s annual precipitation, they also come with risks such as mudslides and flooding.
NOAA researchers have highlighted the long-term effects of climate change on these weather events. A study published warned in 2021 of changing patterns leading to heavy rainfall at low elevations and reduced snowfall at high elevations, which could disrupt water supplies by reducing the snowpack that serves as a stable source year-round.
The storm is expected to bring both challenges and opportunities as residents brace for its impact while water reservoirs may receive much-needed replenishment. Emergency services and weather authorities remain vigilant as the system approaches.
