1. T0450 Thermal Updraught produced locally above a surface relatively warmer than its immediate surroundings.

2. ‘The conditions required for tropical cyclones are also suitable conditions for thunderstorms, deep Convective clouds with strong updraughts.’ ‘This area of the world is one of only a few places where the underlying ocean column is marginally stable enough that this process can occur in the open ocean and lead to Convective chimneys going