... Red flag warning remains in effect until 8 PM PDT Sunday for low humidity and dry north winds for the north and East Bay hills...
* wind... northerly winds of 15 to 25 mph with gusts 35 to 40 mph. Isolated higher peaks could see locally higher winds. Strongest winds will occur overnight through sunrise Sunday.
* Humidity... overnight humidity recoveries will be poor and less than 30% with daytime values teens to mid 20s.
* Highest threat... elevations above 1000 feet, especially in Napa and northern Sonoma County as well as the East Bay hills.
* Impacts... any fires that develop will likely spread rapidly. Outdoor burning or other activities that may lead to fire creation is not recommended.
A red flag warning means that critical fire weather conditions are either occurring now. A combination of strong winds... low relative humidity... and warm temperatures can contribute to extreme fire behavior.