Dangerous heat wave hits L.A.: How long will it last? How high will temperatures soar?

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Set us as preferred The National Weather Service has issued an extreme heat warning for Southern California, warning that as temperatures ramp up over the next few days, the region’s most vulnerable residents could be at risk.Compared with Monday, temperatures on Tuesday across much of the Los Angeles Basin should climb 3 to 6 degrees, and as much as 8 to 10 degrees in the Antelope Valley, according to the weather service’s morning forecast.Temperatures across the region could range between 90 degrees to 110 degrees in the hottest places inland, the weather service said.The extreme heat warning stretches across the foothills between Santa Barbara and Los Angeles counties and inland deserts.“Humid conditions will add to the heat to potentially worsen heat impacts,” the agency’s extreme heat warning said.“Effects of the heat will build through the week, with warm overnight low temperatures providing little relief from the heat.”Highs by Wednesday, away from the coast, will range from 90 to 105 degrees in most of the region, the weather service warned.The extreme heat warning is expected to last until Thursday evening before temperatures begin to drop Friday.

In Los Angeles County, the San Fernando Valley will probably see the most extreme temperatures, with Woodland Hills expected to hit 110 degrees Wednesday.The Antelope Valley could also reach near 110 degrees, while Santa Clarita will be close behind at 105 or 106 degrees, forecasters said.Low temperatures across the region will probably remain in the 70s even overnight, providing little relief and exacerbating health concerns.Despite some scattered thunderstorms, the heat is bringing added fire risks.

Several wildfires have broken out across the state in the last week, including a new one in Los Angeles County on Monday.The Zebra fire began Monday around 7 p.m...