The cooling in the Pacific Ocean has gone on for three years. Its end is usually good news for the U.S. and other parts of the world, including drought-stricken northeast Africa, scientists said.

The latest estimate from various forecast centers around the world say the planet is approaching a warming threshold international agreements are trying to prevent.

Forecasters now say we could be in for a more active hurricane season than they originally predicted. The National Oceanic and Atmospheric...