Mesoscale convective complex

Near the surface, the MCC exhibits high pressure, with an outflow boundary, or mesoscale cold front, at its leading edge.

This divergence at upper-levels and convergence of air at the surface along the cool pool's outflow boundary results in rising motion which aids maintenance of the MCC.

MCCs are found in the United States during the spring and summer months (warm season), the Indian monsoon region, the West Pacific and throughout Africa and South America.

[3] As the warm season progresses, the favorable regions for MCC formation shift from the southern plains of the United States northward.

A second notable MCC brought destructive straight-line winds to southern Ontario, Upstate New York, Vermont, Massachusetts, Connecticut, and Rhode Island on the morning of 15 July 1995.

The MCC produced winds in excess of 160 km/h (100 mph) and was responsible for seven deaths, widespread destruction of forests in the Adirondack and Berkshire Mountains, and over $500 million in property damage.