Weather-related fatalities in the United States may be caused by extreme temperatures, such as abnormal heat or cold, flooding, lightning, tornado, hurricane, wind, rip currents, and others. The National Weather Service compiles statistics on weather-related fatalities and publishes reports every year. In 2016, flooding was the number-one cause of weather-related fatalities, but over a 30-year period, on average, extreme heat is the deadliest form of weather.