Downtown Los Angeles in the heat
A hazy day in downtown Los Angeles. Photo courtesy Emergency Management Department

Dangerous triple-digit and near-triple-digit temperatures baked parts of the Southland Tuesday as a mini-heat wave landed full force — and an expected midweek cool-off was pushed back to Thursday.

With excessive heat warnings in place through Wednesday night — extended from Tuesday night — the mercury hit 102 degrees at 1 p.m. Tuesday in Van Nuys, Chatsworth, Woodland Hills and Pasadena. It was also 99 in Burbank, 96 in Acton and 95 in Lancaster.

The National Weather Service on Tuesday added the Santa Monica Mountains to its roster of areas under an excessive heat warning through 8 p.m. Wednesday — up in severity from the heat advisory that had been in place until 8 p.m. Tuesday for that area.

Excessive heat warnings were also extended from Tuesday at 8 p.m. to Wednesday at 8 p.m. for the Santa Clarita, San Fernando and San Gabriel valleys.

The NWS warned of “dangerously hot conditions with temperatures up to 105. Hottest in the San Fernando and Santa Clarita Valleys.”

Inland areas such as Beverly Hills, Compton, Lakewood, Norwalk, Culver City and Downey — where highs of up to 98 degrees are anticipated — were under an excessive heat warning as well, but only through 8 p.m. Tuesday.

Earlier forecasts had predicted some relief by Wednesday, but now more moderate conditions are expected by Thursday, according to the NWS.

“Persistent high pressure and the associated heat wave will peak (Tuesday) and Wednesday before a weak low to the north brings cooler conditions to the region Thursday,” the weather service said.

“Cooler weather should last through the weekend with increasing night to morning low clouds and onshore winds.”

The NWS also warned of elevated fire conditions through Wednesday due to the hot and dry weather, with the “potential for large vertical plume growth.”

Meanwhile, in Orange County, forecasters issued excessive heat watches through 8 p.m. Wednesday for inland areas, including Santa Ana, Anaheim, Irvine and Fullerton, where temperatures could reach 98 degrees.

The weather service issued its standard cautions during hot stretches.

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

Caution was urged for those working or spending time outside. The NWS advised people to know the signs and symptoms of heat exhaustion and heat stroke, and to wear lightweight and loose-fitting clothing when possible.

A list of L.A. County cooling centers can be found at ready.lacounty.gov/heat/.

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