The heaviest rain seems to be targeting Northern California, where there will be widespread rain totals of at least five to ten inches, but some areas are likely to receive more than 10 inches.

A bomb cyclone refers to a storm system that undergoes bombogenesis, a rapid intensification process where the atmospheric pressure in the storm drops by at least 24 millibars (mb) in 24 hours. This steep pressure drop causes the storm to strengthen explosively, resulting in violent weather.