More than 150 million Americans are under the highest level extreme heat alerts during a wave of above-average temperatures.

Find out where it will be unusually hot, humid, wet and sunny — and what parts of the country might see drought intensify.

Highs will be in the mid to low 90s before another cold front drops us back to average temps in the mid to low 80s Wednesday through the end of ...

There will be three full moons during the summer. And the sky this season has a number of bright stars that form easily ...

The upper trough bringing the Spring-like weather to start Summer is shifting eastward over the Rocky Mts through the weekend.

(Avalanche Photo) Seattle startup Avalanche Energy plans to open a first-of-its-kind facility for commercial-scale testing of radioactive fusion technologies in Eastern Washington. The envisioned ...