The fire in a wilderness area northeast of Los Angeles exploded in size as dry, hot weather Thursday raised the fire risk for large portions of the state.

The Madre Fire became California's largest blaze so far this year, ripping through grasslands after breaking out Wednesday in southeastern San Luis Obispo County. It swiftly grew to more than 82 square miles (212 square kilometers). It was just 10% contained by Thursday evening.

The fire rapidly spread to over 35,000 acres overnight as it burned through grasslands in a section of the Los Padres National Park. By around 9:30 p.m. PT on July 3, the fire expanded to nearly 52,