qStationary: These waves do not move around much and are fixed in certain geographic locations.
qPlanetary: These waves have large wavelengths, one the order of several thousands of kilometers.
qWave: Their structures vary in the zonal direction.
qStationary planetary waves are forced by large-scale mountains (such as Himalaya and Rocky mountain ranges) and heat contrasts between continents and oceans.
qStationary planetary waves are stronger in winter than in summer.
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