An AC Alert was released Monday about 10 a.m. with notice from the National Weather Service stating that a red flag warning is in effect until about 5 p.m. Tuesday for low humidity and dry offshore winds for the East Bay Hills.
According to the alert, the affected areas are the East Bay Hills and fire weather zone 511, which includes all locations above 1,000 feet for the East Bay and the Diablo Range of Santa Clara County, including Mount Hamilton.
Northeast winds will range from 5 to 15 miles per hour, but they will increase to 10 to 20 miles per hour with gusts to 35 miles per hour Monday into early Tuesday morning, the alert said.
Humidity will be 5 to 15 percent and locally lower with little or no nighttime recovery through midweek. The alert added that any fires that develop will likely spread rapidly.
According to the alert, a red flag warning means that critical fire weather conditions will occur or are occurring. A combination of strong winds, low relative humidity and warm temperatures can contribute to extreme fire behavior.