A Cross-Hemisphere Cloud Line Phenomenon

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  • 1 Australian Numerical Meteorology Research Centre, Box 5089AA, Melbourne, Victoria, Australia
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Abstract

A description is given of an Indian Ocean cloud band oriented quasi-meridionally across the equator. The feature is some 3000 km in length and only 10–20 km in core width, but exhibiting more extensive blow-off cirrus. Synoptically, the band is associated with the longitudinal coincidence of outflow from a Northern Hemisphere tropical cyclone with high-level flow eastward of a major Southern Hemisphere trough; however, the detailed dynamics of the phenomenon is obscure.

Abstract

A description is given of an Indian Ocean cloud band oriented quasi-meridionally across the equator. The feature is some 3000 km in length and only 10–20 km in core width, but exhibiting more extensive blow-off cirrus. Synoptically, the band is associated with the longitudinal coincidence of outflow from a Northern Hemisphere tropical cyclone with high-level flow eastward of a major Southern Hemisphere trough; however, the detailed dynamics of the phenomenon is obscure.

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