Meaning of mesoscale

mes•o•scale

Pronunciation: (mez'u-skāl", mes'-, mē'zu-, -su-), [key]
— adj.
  1. pertaining to meteorological phenomena, such as wind circulation and cloud patterns, that are about 1–100 km (0.6–60 mi.) in horizontal extent.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.