Dinah Voyles Pulver

Tree cores pulled from some of the planet’s oldest trees have helped extend records of past weather.

A fire that killed three firefighters also forced evacuation of more than 120 along the Colorado River as officials warn of growing fire danger.

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Also: What trees tell us about weather and climate history

Safety experts say dangerous holiday heat will impact millions. Here's how to stay safe if you're celebrating outside – and when to stay inside.

The nation's 250th birthday weekend coincides with a deadly heat wave. Here are some ways to keep cool and potentially save your life.

As eastern and central U.S. states may soon feel relief from the heat, temperatures will soar in the West.

A heat wave sweeping across much of the eastern and central United States has killed at least 30 in the past week, according to local officials, as more dangerously hot conditions are expected to soon hit the West.

And all eyes on a strengthening El Niño

The Federal Emergency Management Agency aims to be a beacon of hope for people facing disaster. But the agency has faced 18 months of turmoil.