Tropical storms are immensely powerful and can travel up to speeds of 65 km/h. Resembling large whirlpools, they are made up of rotating, moist air, with wind speeds that can reach over 120 km/hr.
There are several specialist tropical storm forecasting centres around the world such as the National Hurricane Centre in Miami, Florida.
The centre uses satellite images, various weather instruments and computer-based prediction modelling to detect and track tropical storms. When tropical storms affecting populated coastal areas are predicted, the centre issues warnings.
Warnings give information to the local authorities of places likely to be in the tropical storm's path, in order to make preparations to protect public safety. These are broadcast over TV and radio and warnings can be issued to smart phones. People in vulnerable coastal areas are usually advised to secure their property and move away. In the USA, this can involve the mass evacuation of a million or more people.
Reinforced aircraft, fitted with various scientific instruments, fly through and over tropical storms to collect data. This can be used to help track and predict the path of a tropical storm.