> [ARkStorm 2.0 update 2022] This update,[7] with parts of the research on impacts still ongoing, has examined how climate change is expected to increase the risk of severe flooding from a hypothetical ARkStorm, with runoff 200 to 400% above historical values for the Sierra Nevada in part due to a decrease in the portion of precipitation that falls as snow, as well as an increase in the amount of water that storms can carry. The likelihood of the event outlined in the ARkStorm scenario is now once every 25-50 years, with projected economic losses of over $1 trillion (or more than five times that of Hurricane Katrina).