mesoscale

[mez-uh-skeyl, mes-, mee-zuh-, -suh-]
adjective
  1. pertaining to meteorological phenomena, such as wind circulation and cloud patterns, that are about 1–100 km (0.6–60 miles) in horizontal extent.

Origin of mesoscale

First recorded in 1955–60; meso- + scale3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018