Researcher Karen McKinnon is behind the forecast, which shows above-normal chances for extreme heat in the eastern United States between late June and mid-July. But an experimental forecast out of the National Center for Atmospheric Research says the odds of unusually hot weather are starting to rise. Midway through June, extreme heat has spared much of the eastern half of the U.S. Back in May, the PEP was conspicuously absent, and McKinnon’s method determined that odds for extreme heat in late June and early July were below normal. A number of long-range forecasts have concluded that the risk of hotter-than-normal weather is highest during the second half of the summer.

Source: Washington Post June 15, 2016 19:30 UTC