![]() ![]() Hazards ĭry thunderstorms are notable for two reasons: they are the most common natural origin of wildland fires, and they can produce strong gusty surface winds that can fan flames. Ī thunderstorm does not have to be completely dry to be considered dry in many areas 0.1 inches (2.5 mm) is the threshold between a "wet" and "dry" thunderstorm. The shaft of precipitation that can be seen falling from a cloud without reaching the ground is called " virga". They are common during the summer months across much of western North America and other arid areas. Any precipitation that falls from elevated thunderstorms can be entirely evaporated as it falls through the lower dry layers. Where dry thunderstorms occur ĭry thunderstorms generally occur in deserts or places where the lower layers of the atmosphere usually contain little water vapor. Because of that, the National Weather Service, and other agencies around the world, issue forecasts for its likelihood over large areas. ĭry thunderstorms occur essentially in dry conditions, and their lightning is a major cause of wildfires. Both are so common in the American West that they are sometimes used interchangeably. Dry lightning refers to lightning strikes occurring in this situation. A dry thunderstorm is a thunderstorm that produces thunder and lightning, but where most of its precipitation evaporates before reaching the ground. ![]()
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