"An expansive dome of unusually hot temperatures for mid-March will engulf much of the West," the Weather Prediction Center said.

Some parts of the county could see highs that "obliterate" previous temperature records, a National Weather Service meteorologist said.

The Coachella Valley could break a 70-plus-year-old record for the hottest March temperature ever recorded in the United ...

The heat index is a measure of how hot it really feels on your body when relative humidity is factored in with the actual air temperature. Since heat index values were devised for shady, light wind ...

High pressure will bring highs into the upper 90s for many spots this week as record-breaking heat continues. Here is a look at your full forecast.

The heat index, or apparent temperature, combines air temperature and relative humidity to indicate how hot it feels. High humidity slows sweating, the body's natural cooling system, making ...

A major heat wave kicked off in the Southland, where temperatures are predicted to soar 25 degrees above normal, smash ...

A heat dome is impacting a large portion of the U.S. with extreme heat warnings, watches, or advisories. The entire state of Florida is under a heat advisory, with heat index values expected to reach ...

Historic heat or another dose of winter? The seasons are battling it out across the U.S. this week.

Underground spaces tend to trap heat. Soil and rock act as insulation, making it harder for warmth to escape. Trains, brakes, ...

Unseasonably hot weather broke or tied several temperature records across San Diego County on Friday, with highs expected to remain above average through the weekend and significant warming ...