Research Question-How are Hurricanes Formed?

A  tropical thunder storm can grow into a massive hurricane under certain conditions . sometimes several thunder storms start rotating around a central area of low pressure . this is called a tropical depression . If the depression strengthens so that winds reach at least 39 mph , it is called a tropical storm. And if wind speeds increase to more than 74 mph, it is called a tropical cyclone or hurricane. Once formed , hurricanes take energy from the warm ocean water to be become stronger.A storm will strengthen if there is a supply of warm , moist air is found above warm it will continue to grow . A hurricane dies when it moves away from the tropics . When a hurricane moves into areas with cooler ocean water,it weakens . It will also weaken if it travels over land.

http://www.infoplease.com/ce6/weather/A0858707.html