Southern California continued to bake Wednesday under sweltering conditions that are expected to stretch through the Labor Day weekend — with excessive heat warnings in effect across the region.

The protracted heat wave began pushing up temperatures Tuesday, marking the onset of an expected weeklong period of oppressive conditions. The forecast has prompted calls for residents to take precautions against heat stroke and to conserve power whenever possible, with state officials warning of possible strain on California’s electrical grid.

The extreme heat and low humidity could create elevated fire weather conditions as well, National Weather Service forecasters said.

Temperatures rose a few degrees Monday and spiked even more Tuesday — with more of the same in the forecast for Wednesday and beyond.

“High pressure will persist over the area creating a prolonged period of very hot conditions with minimal coastal clouds,” according to the NWS. “Triple-digit heat is expected for many valley and mountain locations through early next week including coastal areas during the Sunday and Labor Day peak. This heat may be record breaking and will produce a very high risk of heat illness.”

Wednesday could be the hottest day of the week for areas “on the coastal side of the mountains,” according to the NWS.

“Daily records are likely to be broken today (Wednesday) at Woodland Hills — 111 in 1998; Lancaster — 109 in 1948; Sandberg — 98 in 2017,” according to the Weather Service. “Records are also possible at Burbank — 108 in 2017; and Palmdale — 109 in 1996; with a small chance at Long Beach — 104 in 1967; and Santa Barbara Airport — 94 in 1955.”

By late morning Wednesday, temperatures had already reached the triple-digits in Van Nuys, Chatsworth, Woodland Hills and Acton.

The heat will continue as the weekend approaches, with a minor dip in temperatures anticipated Friday before heating up again for Saturday and Sunday, when “widespread triple-digit heat is expected,” including “kiln-like” heat of 115 degrees or more in the hottest areas, forecasters said.

Forecasters said the heat will persist through Monday, when the high-pressure system finally begins weakening. But some valley areas will likely still have extreme heat into next week.

In Orange County, an excessive heat warning took effect at 10 a.m. Tuesday and will continue through 8 p.m. Monday for coastal and inland areas and the Santa Ana Mountains and foothills. Forecasters said OC beaches will be in the 80s, with inland areas hitting the 90s, and possibly up to 105 farther from the coast in cities such as Anaheim, Garden Grove, Irvine and Fullerton.

In Los Angeles County, the NWS issued an excessive heat warning that took effect at 11 a.m. Wednesday and will also continue through 8 p.m. Monday for the Antelope Valley, Los Angeles County mountains, Santa Monica Mountains, the coastal region and the San Fernando, Santa Clarita and San Gabriel valleys.

Forecasters said temperatures of 95 to 112 degrees were likely through the heat wave, with 100- to 115-degree heat possible Sunday and Monday, accompanied by “abnormally warm overnight temperatures.”

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors,” the NWS urged. “Young children and pets should never be left unattended in vehicles under any circumstances.”

Forecasters also urged residents to be aware of the signs of heat stroke and to take precautions.

“Take extra precautions if you work or spend time outside,” according to the NWS. “When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location.”

Temperatures will be more manageable at the beaches, but will still climb into the upper 80s in Santa Monica beginning Wednesday. Long Beach will see highs in the upper 80s, rising to 89 and 91 next weekend.

Overnight lows will not offer much relief either, staying in the 70s and even in the low 80s in some of the hotter areas.

Meanwhile, the California Independent System Operator, which manages the state’s power grid, noted that it has already issued a Restricted Maintenance Operations order that took effect Wednesday and will continue through next Tuesday — limiting maintenance operations between noon and 10 p.m. each day to ensure all power systems remain in service.

Cal-ISO warned that it may be issuing Flex Alerts, which are calls for voluntary power conservation during peak hours, generally between 4 and 9 p.m. Those alerts are particularly likely over the weekend, according to Cal-ISO.

Cooling centers for Los Angeles County can be found at ready.lacounty.gov/heat/. Cooling centers for the city of Los Angeles can be found at emergency.lacity.org/la-responds/beat-heat, or by calling 311.

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