Hurricanes are massive storm systems that form over the water and move toward land. Threats from hurricanes include high winds, heavy rainfall, storm surge, coastal and inland flooding, rip currents and tornadoes. These large storms are called typhoons in the North Pacific Ocean and cyclones in other parts of the world.
Read more on hurricanes
A tornado is a violently rotating column of air that extends from a thunderstorm to the ground and is often - although not always - visible as a funnel cloud. Lightening and hail are common in thunderstorms that produce tornadoes.
Read more about tornadoes.