Mesoscale Meteorology is the study of weather systems smaller than synoptic scale systems but larger than microscale and storm-scale cumulus systems. The weather is a set of all the phenomena occurring in a given Atmosphere at a given Time. The synoptic scale in Meteorology (also known as large scale or cyclonic scale) is a horizontal length scale of the order of 1000 kilometres (about 620 Microscale meteorology is the study of atmospheric phenomena smaller than mesoscale, about 1 Km or less Storm-scale is a scale of sizes of Weather systems on the order of individual Thunderstorms. Horizontal dimensions generally range from around 5 kilometers to several hundred kilometers. The kilometre ( American spelling: kilometer) symbol km is a unit of Length in the Metric system, equal to one thousand Examples of mesoscale weather systems are sea breezes, squall lines, and mesoscale convective complexes. A sea-breeze (or onshore breeze) is a Wind from the sea that develops over land near coasts A squall line is a line of severe thunderstorms that can form along and/or ahead of a Cold front. A mesoscale convective complex (MCC is a unique kind of Mesoscale convective system which is defined by characteristics observed in infrared Satellite imagery.
Vertical velocity often equals or exceeds horizontal velocities in mesoscale meteorological systems due to nonhydrostatic processes.
Mesoscale Meteorology is divided into these subclasses (Orlanski, 1975):
As in synoptic frontal analysis, literature about mesoscale analysis uses cold, warm, and occluded fronts on the mesoscale to help describe phenomena. Microscale meteorology is the study of atmospheric phenomena smaller than mesoscale, about 1 Km or less Storm-scale is a scale of sizes of Weather systems on the order of individual Thunderstorms. The synoptic scale in Meteorology (also known as large scale or cyclonic scale) is a horizontal length scale of the order of 1000 kilometres (about 620 A surface weather analysis is a special type of Weather map that provides a view of Weather elements over a geographical area at a specified time based on information On weather maps mesoscale fronts are depicted as smaller and with twice as many bumps or spikes as the synoptic variety. In the United States, opposition to the use of the mesoscale versions of fronts on weather analyses, has led to the use of an overarching symbol (a trough symbol) with a label of outflow boundary as the frontal notation. The United States of America —commonly referred to as the 
Orlanski, I. , 1975: A rational subdivision of scales for atmospheric processes. Bulletin of the American Meteorological Society, 56(5), 527-530.
Fujita, T. T. , 1986. Mesoscale classifications: their history and their application to forecasting, in Ray, P. S. , ed. , Mesoscale Meteorology and Forecasting: American Meteorological Society, Boston, p. 18-35. [presented 1984; published 1986]