Mesoscale (i.e. middle-scale) systems ranging in horizontal dimension from 5 to 500 kilometres and typically possessing lifetimes of a day or less, may not be evident on synoptic charts. In mesoscale systems vertical motions may be as significant as horizontal motions. Coriolis has little effect due to the short time period, or to the over-riding magnitude of other forces. Some of these systems might also be classified as 'microscale' but can be grouped in three broad...
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