A stubborn ridge of high pressure will push temperatures as much as 20 degrees above normal in Flagstaff and Phoenix.

The phrase “historic polar vortex” evokes a country locked in ice from the Great Lakes to the Gulf, but the most reliable ...

A deep heat mass beneath the Appalachians appears to have started near a rift between Greenland and North America. Its slow southward journey reveals that ancient tectonic events still influence the ...

Cold snaps and heat waves have contributed to tens of thousands of deaths in the United States over the past quarter-century, a new study says. More than 69,000 U.S. deaths occurred between 1999 and ...

Extreme heat is becoming an urgent priority in the United States and beyond. The threat posed by extreme heat has become a matter of national security, impacting U.S. military readiness, while ...

A record-setting marine heat wave stripped huge portions of Florida's coral reef of their colors in 2023, triggering the ninth and worst mass bleaching event in the Caribbean. Temperatures soared for ...

Water temperatures several degrees above normal span thousands of miles, though they have mostly stopped short of the Pacific Northwest coast. Cool water welling up from the depths is thought to be ...

A massive heat wave is hitting the Pacific Ocean from Kamchatka to California. Water temperatures several degrees above normal span thousands of miles, though they have mostly stopped short of the ...

The June 2023 heat wave in northern European seas was "unprecedented but not unexpected," new research shows. During the heat wave, temperatures in the shallow seas around the UK (including the North ...

The Northeast Pacific ocean, off the U.S. West Coast, is experiencing its fourth-largest marine heat wave since record-keeping began in 1982. “The extent of the current Pacific marine heatwave should ...

From seabirds to sea lions, wildlife along the California coast are now facing “the Blob,” a massive marine heat wave that’s become a recurring anomaly since the early 2010s. The oceanic phenomenon ...