According to the National Weather Service (NWS), dangerously hot temperatures will impact the sunshine state throughout the day and well into the evening. In some parts of California, warnings will remain in place until 11:00 p.m. PDT.

In southwestern California—including Orange County, Coachella Valley, San Diego and Santa Ana—the excessive heat warnings are remaining in effect until 8:00 p.m. PDT today, with temperatures reaching up to 120 degrees Fahrenheit in the lower deserts. High deserts and inland valleys are expected to peak between 108-110 F, with inland Orange County staying in the 90s.

In the San Diego and San Bernardino County Mountains, temperatures are predicted to reach 102 F below 5,000 feet.

In northern California—including western and central Siskiyou County—temperatures are forecast to hit 111 F during the day with “overnight lows as warm as 70,” according to NWS. The warning remains in effect until 11:00 p.m. PDT tonight.

In the Owens Valley in southeastern California, dangerous temperatures are predicted until 8:00 p.m. PDT. NWS forecasts that highs of 115 could be expected and warns that “record-breaking temperatures” will continue throughout the day.

Excessive heat will also impact south-central and southern Nevada and northwest Arizona. According to NWS, there is also a wind advisory in effect until 11:00 p.m. MST Monday.

In Las Vegas, temperatures are expected to be within the 110-115 F range, with Death Valley hitting highs of 120-125 F. Northeast winds will range between 25 to 35 miles per hour with gusts of 40-50 mph expected.

High temperatures can result in heat-related illnesses, says NWS. Anyone who works or spends time outside should take extra precautions and young children and pets should not be left unattended in vehicles.

Heat stroke

What to look for:

High body temperature (103 F or higher). Hot, red, dry, or damp skin. Fast, strong pulse. Headache. Dizziness. Nausea. Confusion. Losing consciousness (passing out).

If anyone is displaying these signs, do these things:

Call 911 right away-heat stroke is a medical emergency. Move the person to a cooler place. Help lower the person’s temperature with cool cloths or a cool bath. Do not give the person anything to drink.

Heat Exhaustion

What to look for:

Heavy sweating. Cold, pale, and clammy skin. Fast, weak pulse. Nausea or vomiting. Muscle cramps. Tiredness or weakness. Dizziness. Headache. Fainting (passing out).

What to do:

Move to a cool place. Loosen your clothes. Put cool, wet cloths on your body or take a cool bath. Sip water.

Get medical help right away if someone is:

Throwing up. The symptoms get worse. The symptoms last longer than an hour.

Heat Cramps

What to look for:

Heavy sweating during intense exercise. Muscle pain or spasms.

What to do:

Stop physical activity and move to a cool place. Drink water or a sports drink. Wait for cramps to go away before you do any more physical activity.

Get medical help right away if:

Cramps last longer than one hour. The person is on a low-sodium diet. The patient has heart problems.

Advice taken from the Centers for Disease Control and Prevention