A persistent heat wave will continue in Los Angeles County Sunday, with peak temperatures reaching triple digits in the valleys and some mountain regions.
“Dangerously hot temperatures are expected across the interior through at least Monday as strong high pressure sits over the West Coast,” the National Weather Service reported.
High temperatures Sunday were forecast at 114 in the Antelope Valley foothills and the Palmdale-Lancaster area, 101 in the San Gabriel Valley and the Santa Monica Mountains, and 107 in the Santa Clarita Valley, NWS forecasters said.
Excessive heat warnings and advisories have been extended through Monday night.
In the Santa Clarita Valley, the Golden State (5) and Antelope Valley (14) Freeway corridors and the San Gabriel Mountains, an excessive heat warning issued Friday will remain in place until 11 p.m. Monday.
Forecasters said that area could see temperatures of up to 108 degrees, dipping at night only into the 70s and lower 80s.
In the Antelope Valley and accompanying foothills, an excessive heat warning will also be in effect through 11 p.m. Monday, with temperatures possibly peaking at 114 degrees and overnight lows dropping into the 70s and 80s.
The San Fernando and San Gabriel valleys and the Santa Monica Mountains Recreational Area will be under a less severe heat advisory until 11 p.m. Monday, with temperatures up to 106 degrees possible, forecasters said.
In Orange County, an excessive heat warning is in effect until 8 p.m. Tuesday, with some temperatures expected to reach 104 degrees.
“Extreme heat will significantly increase the potential for heat-related illnesses, particularly for those working or participating in outdoor activities,” NWS forecasters warned. “Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances.”
The high heat is expected to contribute to “elevated to brief critical fire conditions” in desert, mountain and interior valley areas. Those areas will see humidity levels in the 5% to 15% range. Winds are expected to be relatively light, but some higher gusts are possible in traditionally wind-prone areas.
Elevated temperatures are likely to continue throughout the week, although more onshore flow is expected, helping to cool things off in the valleys. But mountains and interior areas “will likely continue to sizzle,” forecasters said.
According to the NWS, Sunday is expected to be about 2 degrees cooler than Saturday, with another 2- to 5-degree drop anticipated Monday.
The metropolitan Los Angeles area is not facing any heat advisories or warnings, but it will still be warm. Forecasters said the L.A. area in general will see temperatures around 90 during much of the heat wave, with coastal areas the place to be — thanks to highs of about 80.
Meanwhile, many Southland beaches remain mired in low clouds and fog with temperatures in the 70s and 80s — making those areas popular destinations this weekend.