Sea surface temperatures in 2024 broke records and about a quarter of the world’s oceans are experiencing temperatures that qualify as a marine heat wave.

A heat wave was expected to bring record-high temperatures to the midwestern United States this week before spreading to the East Coast, forecasters said. At the same time, a bout of severe ...

Heat alerts are in effect for 16 states from Maine to Kentucky as the dangerous heat wave continues. Boston and Manchester, New Hampshire, both reached a record high of 98 degrees on Wednesday.