A term applied to weather systems that are intermediate in size between synoptic-scale and storm-scale systems. They are generally too small to be adequately studied by the normal synoptic network and to be shown clearly on a standard synoptic chart, and thus lie between about 80 km and 250 km across. Some typical mesoscale systems are the cloud bands that produce lake-effect snow, mesoscale convective complexes, and squall lines. Some authors use the term for rather smaller features that have a spatial scale of between 1 and 50 km.
Subjects: Meteorology and Climatology.