Extreme heat warnings and heat advisories were issued across parts of the U.S. Southwest and Pacific Northwest on Friday.

A National Weather Service (NWS) moderate heat alert expanded to five new states in the south and south-eastern United States between Wednesday and Saturday, according to maps published by the ...

One way the federal weather agency tracks heat danger is with its interactive HeatRisk map. It categorizes heat-related dangers into five risk levels: none, minor, moderate, major and extreme.

PORTLAND, Ore. (KATU) — A heat map project looked at Multnomah, Washington and Clackamas counties and highlighted the problem areas when it comes to the heat. Places in the region that have a ...

The highest NWS heat warning is "extreme," shown on the map by the color purple, which is only in place for a section of southern Texas on Saturday. According to the agency, "this level of rare ...