Santa Ana winds combined with a storm system to produce 100 m.p.h. winds in California and other Western states. The science behind the Santa Ana winds and this storm.
More storms are steering toward California, which is already deluged. Warnings of flash floods and mudslides are in place in some communities, as worries rise about additional flooding.
An unusual weather system pounding the West Coast with as much as 20 inches of rain could bring Christmas snow to East Coast cities for the first time since 2002.