Mandatory evacuations are in effect as of 3 p.m. for the entire city of Calistoga and residents are urged to leave immediately, city officials said.
Residents may shelter at American Canyon High School at 3000 Newell Drive. State Highway 29 is open, and residents are reminded to bring pets and medications when they leave.
Some areas of Calistoga were under mandatory evacuation earlier Wednesday while other areas were under advisory alert.
Sonoma County sheriff’s officials also issued an advisory evacuation order for most of Boyes Hot Springs and the north side of the city of Sonoma around 3 p.m.
The area includes Arnold Drive from Madrone Road south to Petaluma Avenue and east to East Napa Street and Lovall Valley Road.
The best route out of the area is south toward Petaluma, according to the sheriff’s office. Sonoma Raceway is offering space to meet the temporary needs of evacuees with recreational vehicles.