According to the National Weather Service, a mesoscale convective system (MCS) is a complex of thunderstorms which becomes organized on a scale larger than the individual thunderstorms, and normally persists for several hours or more. Mesoscale convective systems may be round or linear in shape, and include systems such as tropical cyclones and lines of thunderstorms called squall lines and often form near weather fronts.
MCS's have been noted across North America and Europe, with a maximum in activity during the late afternoon and evening hours during the warm season (i.e. late spring and summer) on both continents. Mesoscale Convective Systems over the Plains of the United States bring the region about half of their annual warm season rainfall.
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