A red flag fire weather warning will be in place across San Diego County, with the exception of the coast, from 10 a.m. Thursday afternoon to 10 p.m. Friday due to a combination of moderate Santa Ana winds, low humidity and warm temperatures.
The National Weather Service says the winds will arrive out of the northeast and will blow 20 to 30 mph, with gusts to 30 to 40 mph, mostly across the region’s valleys and mountains. A few gusts could reach the 50 to 65 mph range, especially in the Alpine area.
Forecasters say the winds will be strongest on Thursday night and Friday morning.
The relative humidity will drop to about 5 percent in places like Alpine and Ramona, and below 20 percent at and near the coast.
Longer term, it will be “very dry through early next week with periods of mostly weak offshore flow,” the weather service said.
“Low daytime humidity will continue for inland areas with poor overnight recovery. Elevated fire weather conditions will continue except near the coast into early next week with localized near-critical fire weather conditions at times in windier locations.”