SAN DIEGO -- Dry, windy conditions in San Diego County's mountains and deserts this holiday weekend are expected to raise the risk of wildfires.
A National Weather Service red flag warning will remain in effect until Monday morning.
"A trough of low pressure will move inland through the western states through Monday, bringing drier southwest flow aloft and stronger onshore flow," according to the weather service. "This will bring gusty southwest to west winds to the mountains and deserts each afternoon and evening, with humidities in the deserts and desert slopes of the mountains falling to 10 to 15 percent this (Friday) afternoon, and 5 to 10 percent Saturday afternoon."
Winds of 15 to 25 miles per hour and gusts of around 35 to 40 mph are expected each afternoon and evening along mountain ridges and passes, on desert slopes and in the adjacent foothills, according to the NWS.
Forecasters said any fires that develop amid the dry, windy conditions would likely spread rapidly. Outdoor burning is not recommended.
"A combination of strong winds, low relative humidity and warm temperatures will contribute to extreme fire behavior," according to the NWS.
Afternoon high temperatures are expected to be 82 to 90 degrees in the mountains and 100 to 105 degrees in the deserts.