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It is shown that the equation determining the streamlines of large‐scale atmospheric motions (jet streams and long waves) is similar to the equation determining the streamlines of small‐scale gravitational motions of a stratified liquid. Both motions are characterized by the occurrence of jets, the number of jets being determined by the value of a dimensionless parameter. Atmospheric flow at 500 mb is compared with theoretical solutions (derived by Long 1955) of the non‐linear equations for the flow of a stratified liquid. Linearization of the equation for large‐scale atmospheric motions leads to the Rossby wave equation, whereas linearization of the equation for the motion of a stratified liquid leads to Scorer's lee‐wave equation.
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F. K. Ball (1959) studied this question.
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