Much of Southern California is under a flood advisory as rain makes travel dangerous, while a snowstorm heads for the Northeastern U.S.

More than 41 million Americans across California, southern Nevada and northwest Arizona are under flood watches on Wednesday amid a rare, high risk for excessive rainfall and flooding. This includes major metros like Los Angeles, San Francisco, Sacramento, California, San Diego and Las Vegas.

The California Highway Patrol reported a seemingly weather-related crash south of Sacramento in which a Sacramento sheriff’s deputy died. James Caravallo, who was with the agency for 19 years, was apparently traveling at an unsafe speed, lost control on a wet road and crashed into a power pole, CHP Officer Michael Harper said via email.

On Wednesday at 2:54 p.m. the NWS Los Angeles/Oxnard CA released an updated flash flood warning in effect until 6 p.m. The warning is for Los Angeles as well as Santa Barbara and Ventura counties.

Residents of Los Angeles spent the day before Christmas under rain showers and winds of around 40 mph, while the New England area braces for heavy snow later in the week.

Heavy rain and dangerous flooding have left one individual dead in Redding, California, the mayor announced on Sunday.