mesoscale convective system; MCS
Technical meteorological term for a complex of thunderstorms organized on a scale larger than individual storms, often persisting for hours. The abbreviation MCS is also used in Japanese contexts.
Mesoscale convective systems often bring torrential rain.
We are monitoring the movement of the mesoscale convective system with weather radar.
A line-shaped rain band is a type of mesoscale convective system characterized by a linear arrangement of convective cells, often causing prolonged heavy rainfall.
Compound of メソ (meso-, from English 'mesoscale') + 対流 (convection) + 系 (system). The term is a direct calque of the English meteorological term 'mesoscale convective system'.