Why this summer may be especially hot in the United States

A new outlook for summer from the National Weather Service is a toasty one: Hotter-than-normal conditions are favored almost everywhere, except for a small portion of the northern Plains. The highest odds for a hot summer stretch from Texas into the Pacific Northwest, as well as much of the Northeast. This forecast sets the stage for bouts of record-challenging high temperatures throughout the nation and the possibility of the hottest summer ever observed.