The study said atmospheric rivers could become consecutive for weeks on end, like seen in this animation. In this photo provided by the National Park Service, Mud Canyon Road is closed due to flash flooding in Death Valley, California. This study is the first phase of a three-part series studying the effects of a future megaflood event in California. Repetitive atmospheric rivers dropped warm rain for 43 days thereafter, dumping water down the mountainous slopes and into the valleys. The new study shows a rapid increase in the likelihood of week-long, recurring strong-to-extreme atmospheric rivers during the cool season.

Source: CNN August 13, 2022 18:41 UTC