zonal flow Alternating regions of westward and eastward flow, roughly symmetrical about the equator, associated with the belts and zones in the atmosphere of a jovian planet.
zonal flow (Glossary of Weather Terms for Storm Spotters - NOAA) Large-scale atmospheric flow in which the east-west component (i.e., latitudinal) is dominant. The accompanying meridional (north-south) component often is weaker than normal.
"We expected to see the start of the zonal flow for Cycle 25 by now but we see no sign of it," says Hill.
 See also: Temperature, Elements, Earth, Equator, Planet
  
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