Pressure Tendencies and Stability Changes In An Isentropic Surface

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  • 1 Meteorological Service of Canada, Lethbridge, Alta.
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From continuity considerations, a formula is developed for the pressure tendency at a given point in an isentropic surface in terms of the pressure tendency at the ground and the wind distribution in the layer of air between the ground and the chosen isentropic surface. A method is described for computing the pressure tendency field in the isentropic surface from radiosonde and pilot balloon data; and the application of the knowledge of this tendency field to forecasting the motion of the isentropic pressure field is discussed. It is also indicated how the formula for the isentropic pressure tendency may be modified for use in forecasting stability changes in the free air.

*Published by permission of Dr. J. Patterson, Controller of Meteorological Services of Canada.

From continuity considerations, a formula is developed for the pressure tendency at a given point in an isentropic surface in terms of the pressure tendency at the ground and the wind distribution in the layer of air between the ground and the chosen isentropic surface. A method is described for computing the pressure tendency field in the isentropic surface from radiosonde and pilot balloon data; and the application of the knowledge of this tendency field to forecasting the motion of the isentropic pressure field is discussed. It is also indicated how the formula for the isentropic pressure tendency may be modified for use in forecasting stability changes in the free air.

*Published by permission of Dr. J. Patterson, Controller of Meteorological Services of Canada.

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