Tuesday brings the peak of this week's heat wave, with forecasters predicting a high of 96 degrees in San Marino.
The UV Index will top out at 11, so it's a good idea to wear sunscreen if you're going to be outdoors in the afternoon when the sun's rays are at their strongest. The UV Index is measured on a scale of 1-10, and any prediction of 10 or greater means that a fair-skinned person could develop a sunburn in four minutes if they're not wearing sunscreen or protective clothing like long sleeves or hats.
High temps, low humidity and the threat of thunderstorms in the L.A. mountains has prompted the National Weather Service to issue alerts about the threat of fire weather.
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L.A. County has opened a number of cooling centers throughout the region, including one in South Pasadena and San Gabriel. They are primarily for "the elderly and others who face heat-related health difficulties and stress," according to a county press release.