Zone of disturbed weather (or tropical disturbance) :
An area of low pressure relative to the surrounding region; the associated cloud masses are usually not well-organized

Tropical depression :
A non-frontal synoptic scale low-pressure system originating over tropical waters with enhanced convection and/or some indications of cyclonic wind circulation
Winds circulate clockwise around low-pressure and cyclone systems in the southern hemisphere
Gusts associated with tropical depression are generally less than 89 kilometres (km) per hour

Moderate tropical storm :
A non-frontal synoptic scale low-pressure system originating over tropical waters with organized convection and definite cyclonic wind circulation
Estimated gusts associated with moderate tropical storms range from 89 to 124 km per hour

Severe tropical storm :
A tropical storm in which the estimated wind gusts range from 125 to 165 km per hour

Tropical cyclone :
A tropical storm in which the estimated wind gusts range from 166 to 233 km per hour

Intense tropical cyclone :
A tropical storm in which the estimated wind gusts range from 234 to 299 km per hour

Very intense tropical cyclone :
A tropical storm in which estimated gusts exceed 300 km per hour

Gust : rafales