
Warm weather descended on San Diego County today, with inland highs reaching the triple-digit mark, and Thursday could be even hotter, according to the National Weather Service.
While coastal temperatures were generally in the 80s, the mercury hit 100 in El Cajon, Poway, Ramona and Jamul, 99 in Fallbrook and Santee, and 98 in Rancho Bernardo, according to the NWS.
The extreme highs didn't last long because a sea breeze kicked in shortly after lunchtime, said Steve Vanderburg of the National Weather Service.
He said highs Thursday are expected to be two to four degrees warmer.
"It certainly looks like it will be quite hot (Thursday)," Vanderburg said.
The heat, which will be accompanied by low humidity levels, is being caused by a warm air mass moving from southern New Mexico toward Southern California, where it is expected by Friday.
The relative humidity generally stayed well into double digits, reducing the risk of fire.
The only brush fire reported during the day broke out in an artillery impact area in Camp Pendleton. Even though smoke was visible around the North County, Marine Sgt. Darhonda Rodela said the blaze was small and posed no threat.
County health officials encouraged the public to take precautions to stay safe and healthy as temperatures rise into the triple digits.
"Avoid exercising during the hottest times of the day, between 10 a.m. and 4 p.m., and keep an eye on seniors and young children in your family and neighborhood," said Dr. Wilma Wooten, the county's public health officer. "These age groups are most at risk of suffering heat exhaustion and heat stroke."
Signs of heat stroke include, a body temperature higher than 103 degrees, lack of sweating, rapid pulse, headache, nausea, confusion and even unconsciousness.
Anyone with symptoms of heat stroke should be moved into the shade, cooled with water and a call placed to 911.
A man who got lost on a hillside in southeastern Chula Vista needed to be rescued by a helicopter when he became dehydrated, but dispatchers for the San Diego Fire-Rescue Department and Heartland Fire dispatching agency reported that they didn't handle any heat-related distress calls.
County health officials also reminded the public to keep an eye on their pets and never leave animals or children unattended inside a vehicle, where temperatures can quickly reach deadly levels.