Dangerous heat is forecast to expand from the interior West into the Midwest and parts of the East.

Forecasters say a heat dome could bring dangerous temperatures, oppressive humidity to parts of the U.S. next week.

Explosive diarrhea parasite cyclosporiasis is causing possible outbreaks in half of US states. See a map of the rising rates ...

The U.S. population is spread out among 3.8 million square miles across 50 states, yet nearly one-third of Americans live in just three states: California, Texas and New York. New York City alone has ...

A light, 4.2-magnitude earthquake struck in Southern California on Sunday, according to the United States Geological Survey.

Cases of cyclosporiasis continue to climb rapidly as 13 new states reported infections. See map tracking the spread.