High temperatures in the triple digits are again expected in the Antelope Valley and the Inland Empire on Thursday, prompting the National Weather Service to issue an excessive heat warning, but a cooling trend is forecast to start Friday.

The area near the western range of the San Gabriel Mountains will be under a heat advisory.

High temperatures in the triple digits are again expected in the Antelope Valley Thursday, prompting the National Weather Service to issue a excessive heat warning.

"A hot air mass will remain in place across the interior valleys for much of this week, with temperatures well above normal for this time of year," the Weather Service said.

The warmest temperatures are anticipated in the Antelope Valley through Thursday, according to forecasters. The high in that area is expected to reach 107.

An excessive heat warning will be in place in the Antelope Valley foothills and San Bernardino County's Lucerne Valley until 9 p.m. followed by warm overnight low temperatures.

Forecasters urged people in the affected areas to drink plenty of liquids, stay indoors as much as possible and avoid leaving children or pets in vehicles.

"Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke," forecasters said.

One of the areas that really felt the heat Wednesday was the Antelope Valley.

Parks in the area were mostly empty as the temperatures topped 100 degrees before 12 p.m. To beat the heat, some people ran their swamp coolers to save money on their electricity bills while others simply used their air conditioners sparingly to stay cool.

To beat the heat, some people ran their swamp coolers to save money on their electricity bills while others simply used their air conditioners sparingly to stay cool.

"I have my thermostat is set at 74, don't put it up, don't put it down, the house is closed up, we got new windows two years ago, so it's really working," said Antelope Valley resident Patricia Hoxie.

With many residents baking in the sun, staying hydrated is a big key to staying healthy.

"Drink plenty of water, I have water in the car and I drink it quite a bit ... it keeps me hydrated," said Janis Aguilar.