Fig
Pacific Winter Cyclones
qStrong cyclones develop regularly over the Pacific, primarily south and east of the Aleutian Islands of Alaska.
qMost of these cyclones arrive at the West Coast during their occluded stage, with very deep low pressure and strong winds.
qThunderstorms are rarely found with cyclones that originate over the cold North Pacific Ocean because the surface air temperatures are rarely warm enough to cause buoyancy-induced convections.