Diagnosis and prediction of middle level cloud development associated with cold fronts over southern Australia

Autor: S. E. Oliver, R. G. Tapp
Rok vydání: 1989
Předmět:
Zdroj: Meteorology and Atmospheric Physics. 41:231-246
ISSN: 1436-5065
0177-7971
Popis: Broad scale vertical velocities have been used to predict the development over southern Australia of cloud associated with cold fronts. The vertical velocities were determined by solving explicity the quasi-geostrophic omega equation expressed in terms ofQ-vectors. The frontal cloud band was located within the are where up-motion was diagnosed, with the deepest cloud in the vicinity of the strongest upward velocities, and the rear of the band coinciding closely with the change from up- to down-motion. On those occasions when a major cloud mass evolved the region of up-motion extended to low latitudes as a clearly defined band. This band was indicative free a well developed warm conveyor belt associated with the frontal system. Areas of diagnosed down-motion were free of deep, organised cloud masses. Stronger upward motion did not produce an immediate increase in the cloudiness; typically there was a delay of 12 to 24 h before the corresponding cloud development became apparent.
Databáze: OpenAIRE
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