The heat wave baking large swaths of California is driven by a large ridge of high pressure building over the Great Basin. ... What’s causing it, and areas seeing excessive heat warning.

The National Weather Service has extended an Excessive Heat Warning and Heat Advisory for California's interior and Sierra Nevada mountains until the evening of Friday, July 12.

Californians aren’t being spared from the heat this week despite fall approaching. Parts of Southern California are under an excessive heat warning Tuesday as a heat wave brings rising ...

Since the beginning of the month, Southern California has been inundated with excessive heat warnings. The Department of Public Health recommends taking precautions to avoid heat-related illnesses ...

Excessive heat warning in effect for 36 million, ... Many areas in Northern California surpassed 110 degrees (43.3 C), with the city of Redding topping out at a record 119 (48.3 C).

Each local National Weather Service office issues 3 different heat alerts to classify the appropriate level of risk posed by ...

The National Weather Service has extended an Excessive Heat Warning and Heat Advisory for California’s interior and Sierra Nevada mountains until the evening of Friday, July 12.

A powerful heat wave is impacting Southern California, with an excessive heat warning today through Friday affecting much of the region away from the coastline. (Photo by Mario Tama/Getty Images) ...

The heat has not been limited to the Southwest and California. Dozens of Colorado cities, including Denver, have set or tied all-time October temperature records since Tuesday.