TRABUCO CANYON, California — Apocalyptic-looking plumes of smoke filled skies east of Los Angeles on Tuesday as firefighters battled three major wildfires that erupted amid a blistering heat wave and threatened tens of thousands of homes and other structures.

Evacuation orders were expanded Tuesday night as the fires grew and included parts of the popular ski town of Big Bear and the entire community of Wrightwood, with about 4,500 residents. Authorities implored people to leave their homes.

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