The first in a new series of atmospheric rivers flowed into California on Thursday, and forecasters warned that widespread heavy rain would raise the threat of flooding in a state still digging out from earlier storms.
Rain spread across the north by early afternoon. But forecasters said the heart of the atmospheric river wouldn’t arrive until late in the day. The heaviest downpours were expected to last into early Friday, followed by lesser precipitation.
The snowpack at high elevations is so massive it should be able absorb the rain, forecasters said. But elevations below 4,000 feet will see melting and runoff. A 50-mile stretch of coastal Highway 1 south of Big Sur was closed until at least Friday, after multiple rockslides were reported. California’s Sierra Nevada snowpack, which provides about a third of the state’s water supply, is more than 180% of the average on April 1, when it is historically at its peak.
Roofs collapsed, cars were buried and roads were blocked. Gov. Gavin Newsom declared emergencies in 13 of California’s 58 counties beginning March 1.
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