A STUDY OF CONSTANT ABSOLUTE VORTICITY TRAJECTORIES ON ISENTROPIC SURFACES

The meteorologist is ofter called upon to forecast for periods in excess of 24 hours for which simple extrapolation is generally insufficient. One method of forecasting entails preparation of prognostic surface charts and preparation of forecasts from these charts. One of the important tools used in estimating the position and intensity of surface systems is a prognostic 500 millibar chart. At present, much attention is being paid to the problem of upper air prognosis, and considerable information has been published concerning forecasting the 500 millibar surface. One aid to prognosis of upper air charts is the construction of forecast air parcel trajectories based on the principle of conservatism of the vertical component of absolute vorticity. A fundamental equation was integrated and trajectories were obtained for particles which conserve their vertical component of absolute verticity. This trajectory is known as the Constant Vertical Component of Absolute Vorticity Trajectory.