Abstract
The effect of vertical motion on pressure and temperature changes is briefly discussed, and the role of vertical velocities in the process of condensation is stressed. Two independent methods for the measurement of vertical velocities are outlined, and a practical technique for computation is described. The effect of vertical velocities in bringing about changes in sky condition and weather is illustrated in two cases. The field of vertical velocity from the surface to thirteen kilometers through a Colorado Low is illustrated by means of a cross‐section showing in the vertical plane the projections of streamlines of air flow, pressure changes, type of temperature advection, and the locations of the tropopause and the trough line.
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