A rapidly growing wildfire south of Lake Tahoe jumped a highway, prompting more evacuation orders and the cancellation of an extreme bike ride through the Sierra Nevada on Saturday as critically dangerous wildfire weather loomed in the coming days.

The Tamarack Fire, which was sparked by lightning on July 4, exploded overnight and was over 32 square miles (82 square kilometers) as of Saturday evening, according to the Humboldt-Toiyabe National Forest.