heat wave

The Forest Service is also warning that air quality is likely to deteriorate as wildfires continue to burn.

There's been about two degrees Fahrenheit of warming so far worldwide. That may sound like a small number, but scientists say it's enough to make extreme weather events much more common.

With much of the U.S. already sweltering this summer, even avid runners, hikers and bikers are wilting. We've got 10 strategies from experts on how to enjoy hot weather exercise without keeling over.

A new study finds that for more than 70% of all U.S. counties, urban temperatures are higher in neighborhoods that have low-income people and communities of color.

The town of Lytton, British Columbia, caught fire and was completely evacuated Wednesday, just one day after setting a new all-time Canadian heat record with a high of 121 degrees Fahrenheit.

Heat-related illnesses have sent hundreds of people to the ER across the region as temperatures hit unprecedented highs. British Columbia reported about 100 excess deaths from Friday to Monday.

The Pacific Northwest is being scorched. Trapped beneath a heat dome, the effects of extreme heat are being seen in dramatic detail.

From the Great Plains to the California coast, a powerful "heat dome" is setting records. This one is stronger and bigger and is appearing earlier than normal.

When a weather station in Death Valley recorded a high of 130 degrees Sunday, it triggered an inquiry to verify the reading. Here's a look into the exacting process of vetting extreme weather claims.

Any visitors to the national park are getting blunt advice: "Travel prepared to survive." It's part of a heat wave that is forcing rolling blackouts in the West.

Heatstroke tends to get the most attention during extreme heat waves. But other diseases are affected by high temperatures as well.