With few exceptions, summer temperatures across the U.S. have risen since 1970.
Shifting seasons due to climate change could darken foliage, costing states billions in lost revenue.
A Western heat wave made the drought worse this week, even as more relief came to the High Plains.
The NWS is forecasting a widespread severe weather outbreak from the Midwest to the Appalachians.
Violent weather in the Plains and Midwest ranged from tornadoes, intense drought and life-threatening flooding.
Frequent and intense weather events in the U.S. cited in climate studies carry a heavy price tag.
Drought divides the U.S. into two distinct parts. In the West, a long, hot and dry summer is ahead.
Recent shifts from flood to drought and back to flood may be a sign of what's to come due in part to global warming.