Size scale referring to weather systems smaller than synoptic-scale systems but larger than storm-scale systems. Horizontal dimensions generally range from around 50 miles to several hundred miles. Squall lines , MCCs , and MCSs are examples of mesoscale weather systems.
MESOSCALE
Meaning of MESOSCALE in English
A comprehensive English glossary of weather. Полный английский глоссарий погоды. 2012