A heat wave hit much of the central U.S. over the weekend, while snow and cool temperatures arrived in the Northwest.

Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

Maps show the extreme weather so far, and the precipitation forecast. By Judson Jones Zach LevittBea Malsky and Scott Reinhard The western coast of the United States has been hit relentlessly by a ...

A map shows areas in California where temperatures are expected to surpass 100 this week. Why It Matters. There has been an early-season heat wave in Southern and Central California. On Monday ...

The United States has seen 21 category five (EF-5) tornadoes, the highest ranking on the Enhanced Fujita scale, since 1980, and eight of those hit the traditional Tornado Alley.