The Tubbs Fire, which burned much of northern Santa Rosa earlier this week, is now advancing eastward toward Calistoga.

The entire Napa County spa town of Calistoga was placed under mandatory evacuation orders late this afternoon. The San Francisco Chronicle reports that the popular vacation destination looks like a “ghost town” at the moment, after an emergency alert telling people to get out now was sent at around 3 p.m. 

The Tubbs Fire isn’t the largest of the dozen or so fires that broke out around the North State Sunday night and Monday morning, but it has been the most damaging. It quickly burned through northern Santa Rosa, destroying whole neighborhoods. 

All told, at least 17 people have been killed since the fires in Sonoma, Napa, Mendocino and Lake counties began. Thousands of buildings have been destroyed, and tens of thousands of people have been displaced and over 100,000 acres have burned in less than three days. It is one of the worst natural disasters in California history.