Rapid fire growth is possible with north winds blowing at 15-30 mph and gusts reaching 40-60 mph through tomorrow. Winds will peak tonight into tomorrow morning.
RELATED: Bay Area jumps to 'extreme' drought category
Some of the areas that will be most impacted are the East Bay valleys and hills, Diablo Range and North Bay mountains.
The threat of critical fire conditions spreads into the Central Valley with 4.5 million in California under a Red Flag Warning.
Click the video above to watch Meteorologist Mike Nicco's extended breakdown of the days ahead.
Watch the latest AccuWeather forecast and take a look at recent weather stories and videos.