California faces severe storms and heavy rainfall, upgraded to a "bomb cyclone" by meteorologists.
Bomb cyclones, or bombogenesis, result from a collision of cold and warm air masses, causing a rapid drop in atmospheric pressure.
The atmospheric pressure drop recorded on Sunday in California is considered historic, according to UCLA climate scientist Daniel Swain.
The drastic pressure drop from San Francisco to Los Angeles sets a record for February and ranks among the most severe drops ever recorded.
The swift change in pressure poses deadly consequences, leading to fallen trees, road closures, and heightened flood risk.
Recent wildfire activity and wet conditions increase the threat of mass flooding across the state.
The National Weather Service extends a flood watch in the Bay Area until 10 a.m. Monday, with the last comparable storm in 2010.
Debris flows and flooding are warned of in areas with saturated soil from prior rainstorms.
High-impact weather continues, with closed highways in Big Sur, a winter storm warning in Tahoe, and Southern California expecting one of its most dramatic weather days.
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