Nine atmospheric rivers dropped feet of rain and snow across California and the West Coast from late December to mid-January. The deluge caused deaths, landslides and flooding, but improved the drought situation across a large chunk of the western United States.
Flood risk across California is growing, partly thanks to storms producing more rain than snow. The updated Central Valley Flood Protection Plan plots a path to better flood management and infrastructure, especially in the most vulnerable communities of the Central Valley.
Mountain snow – a bank account for water across the western U.S. – has turned up insufficient funds this year. The Sierra Nevada snowpack melted nearly a month earlier than usual, leaving reservoirs without their usual inflow of freshwater.
The 2021 SnowEx field campaign, which is helping determine how much water winter snowpack holds, has come to a close. Teams took snow measurements at six sites across the western U.S., on the ground and with drones and airplanes flying overhead.