U.S. map of common regional heatwave patterns across the contiguous U.S.  with a graph below showing the projected rising contribution of global warming to extreme heatwave

(top) Regional heat wave patterns in the U.S. from 1900-2010 overlaid on a map of U.S. population. (bottom) Projected increases in the contribution of human-caused global warming to heat wave frequency in the mapped regions in the coming century. NOAA Climate.gov image adapted from Hosmay et al., 2018.