THE INFLUENCE OF INERTIAL INSTABILITY UPON TRANSOSONDE TRAJECTORIES AND SOME FORECAST IMPLICATIONS

J. K. ANGELL U.S. Weather Bureau, Washington, D.C.

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Abstract

Trajectory configurations resulting from the passage of transosondes through regions of inertial (dynamic) instability are considered. It is shown that cusped trajectories and trajectories with small anticyclonic loops occur downstream from such regions, with the particular trajectory configuration most likely dependent upon the magnitude of the pressure gradient in the area where the transosonde velocity approaches zero. The large geostrophic departures existing in, and downstream from, regions of inertial instability make conventional trajectory estimations within such regions difficult, if not impossible. Cases are discussed wherein there is evidence that large ageostrophic flows associated with regions of inertial instability are precursors of changes in pressure pattern.

Abstract

Trajectory configurations resulting from the passage of transosondes through regions of inertial (dynamic) instability are considered. It is shown that cusped trajectories and trajectories with small anticyclonic loops occur downstream from such regions, with the particular trajectory configuration most likely dependent upon the magnitude of the pressure gradient in the area where the transosonde velocity approaches zero. The large geostrophic departures existing in, and downstream from, regions of inertial instability make conventional trajectory estimations within such regions difficult, if not impossible. Cases are discussed wherein there is evidence that large ageostrophic flows associated with regions of inertial instability are precursors of changes in pressure pattern.

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