Firefighters are responding to a fast-moving wildfire called the Madre Fire, which has now burned 79,630 acres in rural

The fire has prompted evacuation orders, warnings and highway closures in San Luis Obispo County about 100 miles north of Los Angeles.

A fast-moving California wildfire exploded to become the state’s biggest of the year, forcing evacuations and the closure of a highway, and evoking memories of the devastating blazes that laid waste to parts of the state in January.