A small high that may be created by precipitation and vertical instability associated with thunderstorm activity. A product of downdrafts, it is relatively cold and often has the characteristics of a different air mass. Unstable, overrunning air may form squall lines on its leading edge. Also known as a meso high.
A small high pressure system, complete with anticyclonic circulation, of the order of 50 to 300 miles across, often induced by precipitation and vertical currents associated with thunderstorms.
mesoscale area of high pressure, typically associated with cooler air from the rainy downdraft area of a thunderstorm or a complex of thunderstorms. A gust front or outflow boundary separates a bubble high from the surrounding air.