Updated Thursday, April 23 – 10 am
A buildup of moisture in an unstable atmosphere will create a slight chance of thunderstorms in mountain areas of the Southland today and a chance of showers in Los Angeles and Orange County communities closer to sea level, forecasters said.
Any precipitation that develops in L.A. and Ventura counties will be late this afternoon or tonight, said National Weather Service meteorologist Curt Kaplan. There could be up to a half-inch of rain in the mountains, and as little as a 10th of an inch — “or nothing al all” — in built-up areas, he said. In Most of L.A. County, the chance of measurable precipitation was set at 20 percent.
A deep marine layer is expected Friday morning, and that could produce light rain or heavy drizzle Friday and Saturday, Kaplan said.
On Sunday, a high-pressure system is expected to move in, and above- normal temperatures are forecast to return by Monday, forecasters said.
The NWS forecast mostly cloudy skies today and highs of 56 on Mount Wilson; 63 in San Clemente; 64 at LAX; 65 in Avalon and Laguna Beach; 66 in Newport Beach and San Gabriel; 68 in Long Beach and Burbank; 69 in downtown L.A, Pasadena, Woodland Hills, Saugus, Palmdale, Lancaster and Mission Viejo; 70 in Fullerton and Irvine; and 71 in Anaheim and Yorba Linda.
Similar conditions are expected Friday. Temperatures will be marginally higher in some communities under partly cloudy skies Saturday, then rise a few degrees Sunday and a few more on Monday, when many local communities will experience above-normal temperatures in the 80s once again, along with sunny skies. The warm, sunny weather will last several days.