The National Weather Service has extended the Red Flag Warning for the Sierra Nevada, which is now in effect until 8 PM this Friday.
A strong ridge of high pressure over central California, along with an offshore flow is creating very dry conditions. Prolonged periods of single digit humidities are occurring across the mountains and will continue through at least Friday evening, especially at elevations above 4,000 feet.
Winds of seven to ten mph will continue. Locally higher gusts up to fifteen mph will be possible this evening.
The humidity is less than 10 percent at many locations. Humidity will remain low through Friday evening.
Any fires that develop will likely spread rapidly. Outdoor burning is not recommended during the extended period of low humidity.
A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.