A storm is forming in the Gulf of Alaska Friday and expected to begin dousing the Southland Sunday afternoon, the National Weather Service said.
The storm is expected to generate an inch or an inch-and-a-half of rain in Downtown L.A. but up to 3 inches in the San Gabriel Mountains, said NWS meteorologist Kristen Stewart.
She said no mudslides or debris flows are expected — not even over slopes denuded by wildfires — but there is a slight chance of thunderstorms, which would alter that forecast.
In the San Gabriels, snow is expected above the 6,000-foot level and is not expected to affect Interstate 5.
An extended NWS forecast indicates that rain is expected Sunday and Monday followed by showers Tuesday, Wednesday and Thursday.
The Weather Service says between a half-inch and an inch of rain is expected Sunday in coastal and valley areas and 2-3 inches in the mountains.
Partly cloudy skies are expected Friday, along with highs of 56 degrees on Mount Wilson; 64 in Avalon; 69 in Long Beach, Palmdale, Lancaster and at LAX; 71 in Pasadena, San Gabriel, Burbank and Saugus; and 72 in Woodland Hills and Downtown L.A. Highs will be a few degrees lower amid Sunday’s rain and remain roughly at the same level through Thursday.
In Orange County, sunny skies are expected Friday, along with highs of 52 on Santiago Peak; 60 on Ortega Highway 2,600 feet; 63 in Laguna Beach; 64 in San Clemente; 66 at Fremont Canyon and Newport Beach; 68 at Trabuco Canyon; 69 in Mission Viejo; 70 in Yorba Linda; 71 in Fullerton; and 72 in Irvine and Anaheim. No rain is expected in Orange County until Monday, when highs will be up to 11 degrees lower than Friday, followed by showers Tuesday, Wednesday and Thursday.