ABSTRACT
Tropical cyclone motion results because the storm is embedded in a larger scale region of moving air, referred to as the steering current, which tends to move the low-level cyclonic, upper-level anticyclonic circulation and associated deep cumulonimbus convection in the direction of that flow. The cyclone itself, of course, is part of the large-scale flow, so that defining the appropriate steering current is difficult. The motion of the cyclone is also influenced by its own internal flow which, in general, is asymmetric with latitude variations across the storm (Holland 1983).
