A prolonged heat wave will bring highs over 105 degrees in many Los Angeles County valleys and over 110 degrees in some deserts, with widespread extreme heat warnings through Saturday. Overnight lows remained above 70 degrees in parts of the L.A. Basin, reducing nighttime relief and increasing health risks and fire potential. A red flag warning covers Los Angeles and Ventura County mountains and foothills through Saturday night, while monsoonal thunderstorms could produce localized winds, flooding, debris flows and dry lightning through Monday. Temperatures are expected to drop a few degrees by Saturday but stay above seasonal averages into next week.
Friday is forecast to bring more sizzling heat, with temperatures and conditions similar to Thursday when highs hit over 105 degrees in many Los Angeles County valleys and over 110 in some deserts. A widespread extreme heat warning remains in place for much of Southern California through Saturday, warning of "dangerously hot conditions" causing a high risk for heat illnesses. Many areas Thursday night into early Friday experienced little cooling, with temperatures across the L.A. Basin remaining above 70 degrees.
"Extreme heat is dangerous even at night," the weather service's Weather Prediction Center wrote in a heat wave update. The extreme heat poses "a threat to anyone without effective cooling and adequate hydration." The National Weather Service continues to warn of a trio of threats through this weekend: the extreme heat, elevated fire conditions, and a chance for monsoonal thunderstorms. A red flag warning remains in effect for the Los Angeles and Ventura County mountains and foothills through Saturday night.
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