Serving the Citizens of Jefferson County, Alabama Hazards: Thunderstorms A thunderstorm is formed from a combination of moisture, rapidly rising warm air and a force capable of lifting air such as a warm and cold front, a sea breeze or a mountain. All thunderstorms contain lightning. Thunderstorms may occur singly, in clusters or in lines. Thus, it is possible for several thunderstorms to affect one location in the course of a few hours. Some of the most severe weather occurs when a single thunderstorm affects one location for an extended time. For more information, visit: www.fema.gov/hazards/thunderstorms/. Other Hazards: • Lightning • Tornadoes • Hurricanes • Floods • Extreme Heat • Winter • Earthquakes • Fire • Nuclear • Terrorism Website maintained by the Jefferson County Emergency Management Agency, Birmingham, Alabama