Tropical Wave

Here are three explanations we found:

1) A trough or cyclonic curvature maximum in the trade-wind easterlies. The wave may reach maximum amplitude in the lower middle troposphere.

2) A hurricane goes through many stages as it develops. It starts as a tropical wave, a westward-moving area of low air pressure.

3) A kink, or bend in the normally straight flow of surface air in the tropics which forms a low pressure trough, or pressure boundary, and showers and thunderstorms. Can develop into a tropical cyclone.