Heat-related advisories were in place across eight states on Tuesday, as the National Weather Service continued to warn of "dangerously hot conditions" in some parts of the U.S.

"Don't underestimate the heat! It is the deadliest weather phenomenon in the U.S.A.," the NWS says. In southwest Arizona and ...

A regional air quality alert has been issued for parts of Southern California as two fires continue to burn in Riverside ...

At least eight states were expected to see temperatures that would feel hotter than those in Death Valley—often referred to ...

Millions of Americans were urged to stay indoors Friday as hot and humid conditions were expected to blanket large portions ...

Temperatures in Florida, Georgia, Arkansas, Tennessee, Kentucky, Indiana, Illinois, North Carolina, and Virginia could feel ...

Millions of Americans in the Northeast are being advised to avoid strenuous physical activity outdoors due to unhealthy air ...

The U.S. Geological Survey notes that groundwater is the source of drinking water for about half of the total U.S. population ...

The NWS forecast office, Baltimore-Washington, on X, formerly Twitter, on Monday: "Temperatures will further warm today with ...

Images and footage shared on social media captured the moments that bolts of lightning flashed beneath a rainbow-streaked sky ...

Health officials advise minimizing UV exposure by staying out of the sun from 10 a.m. to 4 p.m., regularly reapplying ...

An air quality alert published by the NWS warned that the South Coast Air Quality Management District (AQMD) had issued a ...