Atmospheric river to soak Southern California, Southwest

Alex Sosnowski

AccuWeather senior meteorologist

Following a delayed start to the wet season in fire-ravaged California, the switch has been turned on as a series of storms continues to douse the Golden State.

Soon after a storm over Northern and Central California winds down, a new plume of moisture, or an atmospheric river, a plume of tropical moisture in the atmosphere that can result in heavy rainfall or snowfall in a narrow swath, will unleash heavy rain and high country snow over Southern California to the interior Southwest at midweek.

North-central Montana is expected to continu...