A long-duration heat wave is taking shape over the western half of the U.S. and forecast to stick around in the days ahead.

From the Pacific Northwest to Antarctica, it's extraordinary warmth that's punching through climate norms with the most force.

Add Yahoo as a preferred source to see more of our stories on Google. A record-breaking heat wave could raise temperatures 15 to 35 degrees above normal this week, increasing the potential for ...

This week, the Western US is facing an atypical March heat wave, bringing near-record high temperatures across many locations. San Jose, Livermore, Napa, Concord, and many other inland areas will be ...

Meteorologists are reaching for superlatives to describe an oncoming heat wave so intense and rare for this time of year that it could leave some locations shattering their all-time temperature ...

A historic March heat wave has already smashed monthly records in dozens of cities in the West. This unusually early heat has spread into parts of the Plains and will have staying power in the ...