![]() The boundary between the rain-cooled air and warm-moist air is called the gust front.Īir forced up by the gust front begins the next new thunderstorm cell formation. The cooler, more dense air hugs the surface as it spreads, forcing lighter warm-moist air up into the atmosphere. This downdraft marks the dissipation stage of that particular thunderstorm cell. As the rain-cooled downdraft reaches the Earth's surface, it spreads horizontally. A derecho comes from a long-lived bow echo or a series of bow echoes.īow echoes usually arise from a cluster of storms, but may also begin from just a single supercell thunderstorm. The term "bow echo" is based on how bands of rain showers or thunderstorms "bow out" when the storm's strong winds reach the surface and spread horizontally. National Centers for Environmental Predictionĭerechos typically are associated with bands of showers or thunderstorms that assume a curved or bowed shape.Preparedness and Mitigation: Individuals (You!).Preparedness and Mitigation: Communities.The Positive and Negative Side of Lightning. ![]()
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