Three large wildfires continued to burn in California as a record-breaking heat wave lingered across large swaths of the western United States on Monday.

The Creek Fire, which has engulfed the Fresno area in central California and caused the emergency evacuation over the weekend of more than 200 people vacationing at a popular reservoir, was still 0% contained as of Monday afternoon, fire officials said.

The blaze, growing under “extreme weather conditions,” had devoured nearly 79,000 acres (32,000 hectares) of land, while a cause remained under investigation, the California Department of Forestry and Fire Protection (CalFire) said in a statement.