Heat advisory through Friday in the mountains while marine layer keeps coast, Salinas cool.

While the Central Valley and parts of Southern California are baking under record-breaking temperatures this week, the Central Coast is staying cool thanks to the marine layer.

But Monterey County is home to some "tricky microclimates," says Roger Gass, lead NOAA meteorologist for the region. Which means while it will stay cool on the coast, it's going to be mighty hot at higher elevations inland.

The high heat—which could trigger heat related illnesses—prompted the National Weather Service issued a heat advisory through 8pm, Friday, July 27.

The areas impacted include Arroyo Seco, Lake San Antonio, Fort Hunter Liggett, Los Padres National Forest, and into San Benito County, including Pinnacles National Park. Greenfield, King City and other parts of South Salinas Valley are also affected.

"The reality is the heat is confined to the higher elevations," Gass says, mostly 1,000 feet and above.

On Tuesday, July 24, temperatures reached 107 degrees at Fort Hunter Liggett and 108 degrees in Arroyo Seco.

Low offshore winds have kept the marine layer in place, which means the Monterey Peninsula, Salinas and North County have stayed cool, although temps were just slightly above average for this time of year on Tuesday.

Meanwhile, the heat in other parts of California is setting new records. The temperature soared to 111 degrees at UCLA, surpassing a record of 109 degrees set in 1939.

"Thankfully here on the Central Coast our natural air conditioner is staying around," Gass says.