Other heat-related health effects include heat cramps, heat exhaustion and heat stroke. The most sensitive regions are those where extremely high temperatures occur infrequently or irregularly. Milder winters may result in fewer deaths in winter months. However, many winter deaths are due to respiratory infections such as influenza, and it is unclear as of yet how influenza transmission would be affected by warmer winter temperatures. Extreme weather events Scientific evidence indicates that increases in heavy precipitation have occurred over the last 20 years and that this trend may continue in the future.
Climate change is projected to increase the frequency of extreme precipitation events.
Model projections are unable yet, however, to predict changes in the frequency, severity, timing, or duration of extreme events like storms, tornadoes and hurricanes. Injury and death are associated with these weather events. Severe storms caused 600 deaths and 3,799 reported injuries in 1997 alone. Floods are the most frequent natural disaster and the leading cause of death from natural disasters in the U.S. Other health effects from extreme weather include bacterial proliferation and drinking water contamination, as well as post-traumatic stress disorder. Air pollution and health Weather and air pollution levels are connected.