The North Pacific jet stream is very energized often screaming along at 180-200 knots with a strong zonal component (West --> East) in central Pacific.

Storm systems feed off that jet stream energy, combine with ocean moisture, and create bomb cyclones.

Watch out US West Coast! pic.twitter.com/0SivrLjGtj

— Ryan Maue (@RyanMaue) October 19, 2021