How can you predict Tropical Storms? How are they issued?

In Miami, Florida there is a National Hurricane Centre which uses -Satellite Images -Certain weather instruments -Computer based predictions. If populated areas are at risk, warnings are issued out and is presented in TV's, Magazines and more. In USA, mass evacuation can be done quickly. Reinforced aircraft with scientific instruments fly over the storm to collect data. This is used to see the path of the storm