Ahotter-than-usual summer is likely to occur in the U.S. and many other parts of the globe, according to new forecasts and scientific research.
Why it matters: Extreme heat is a major public health threat and plays a role in droughts and wildfires.
Hot weather, particularly when it occurs during prolonged heat waves, also threatens the reliability of the nation's increasingly strained electricity grid. The big picture: An ongoing El NiƱo event in the tropical Pacific Ocean is quickly fading, with cooling ocean temperatures at and beneath the surface.