 Temperatures returned to normal or even below average in other parts of the country for the remainder of the summer.Although comparatively little reporting is made about the health effects of extraordinarily hot conditions, heat waves are responsible for more deaths annually than more energetic natural disasters such as lightning, rain, floods, hurricanes, and tornadoes.Supporting this conclusion, Karl Swanberg, a forecaster with the National Weather Service, reported that between 1936 and 1975, about 20,000 U.S. residents died of heat.