Environment & Science

Gloomy, wet conditions forecast for some of weekend and Monday

File: A man crosses a Los Angeles street during a steady rainfall in September 2015.
File: A man crosses a Los Angeles street during a steady rainfall in September 2015.
File photo by Frederic J. Brown/AFP/Getty Images

The weather is changing this weekend, with gloomy skies covering much of the Southland Saturday afternoon and evening and a few hours of rainfall forecast for Sunday morning, the National Weather Service says.

After a partly cloudy break Sunday afternoon and night, showers and possibly thunderstorms are forecast for Monday, according to the NWS.

Saturday's gloominess, which could turn into light rain in some areas of northern Los Angeles County, is the result of a broad warm front. It will be pushed out by a fast-moving cold front expected to bring rain into the L.A region on Sunday morning, the NWS said. A high-surf advisory that's currently in effect will continue into Tuesday.

Rain clouds are expected to begin moving into Santa Barbara and Ventura counties around midnight Sunday, and should then sweep into Los Angeles County just before dawn, according to an NWS statement. The front is expected to bring moderate to heavy precipitation, dropping about a half-inch of rain over a three- to five-hour period Sunday morning in L.A., Ventura and Orange counties, with rainfall totals of over an inch possible along south-facing slopes in the foothills.

"There may be enough moisture and instability for at least a slight chance of shower development [the remainder of Sunday], but it should be mostly dry," the NWS statement said. "In fact, there will probably be some sunshine from time to time."

The remainder of Saturday is expected to have high temperatures ranging from the mid-60s to near 70 degrees, with a 20 percent chance of rain. Temperatures are forecast to drop into the 50s overnight.

The weather service is predicting a 100 percent chance of rain on Sunday morning, clearing into partly cloudy skies, with south winds around 15 mph shifting to westerly winds of 15 to 25 mph in the afternoon. Temperatures will be in the high 60s.

Sunday night's forecast calls for partly cloudy skies in the evening, with a 20 percent chance of rain after midnight. Temperatures will drop into upper 40s and low 50s overnight, with the west winds continuing at 15 to 25 mph.

On Monday, there is a 90 percent chance of rain, possibly heavy at times with showers likely in the morning and a chance of thunderstorms in the afternoon, the weather service said. High temperatures are expected to be in the upper 50s to mid 60s, with northwest winds of 15 to 25 mph in some areas during the afternoon.

By Monday evening, skies will be mostly cloudy with rain chances dropping to 50 percent, although showers and thunderstorms could still be possible, the weather service said. Partly cloudy skies are forecast for around midnight with overnight temperatures in the 40s to around 50.

For Tuesday through Thursday, the forecast predicts sunny to partly cloudy skies with highs in the mid to upper 70s and lows in the mid 40s to mid 50s.

Mostly cloudy skies are seen moving back into the region Thursday night and Friday, with slight chances of rain and high temperatures in the low to mid 60s.