The term "cyclone" refers to such storms' cyclonic nature, with counterclockwise wind flow in the Northern Hemisphere and clockwise wind flow in the Southern Hemisphere. The oppositedirection of the wind flow is a result of the Coriolis force. Depending on its location and strength, a tropical cyclone is referred to by names such as hurricane, typhoon, tropical storm, cyclonic storm,tropical depression, and simply cyclone.
Flooding is an overflowing of water onto land that is normally dry. It can happen during heavy rains, when ocean waves come onshore, when snow meltstoo fast, or when dams or levees break. Flooding may happen with only a few inches of water, or it may cover a house to the rooftop.
Flooding occurs in every U.S. state and territory, and is a threatexperienced anywhere in the world that receives rain. In the U.S. floods kill more people each year than tornadoes, hurricanes or lightning.
There are several different scenarios that cause a flood.One such scenario involves large amounts of snow that melts faster than the ground can absorb it. In flat areas this can cause large amounts of standing water. This water drains into streams, as itfinds its way off the mountains, but there is so much of it, that often the waters overtake the stream bed and gush downhill, making their own path. These waters not only gain volume (both in liquidform and in debris), but also speed. By the time it reaches habitation, it has become a racing wall of water and debris that sweeps up everything in its path.
Another flood scenario is caused byintense rains. These torrents may not last long, but the rain comes down faster than the ground and drainage systems can dispose of it. This causes pooling of water in ditches, across roads and yards,and sometimes in basements of houses. These are flash floods. Flash floods are just as dangerous as any other flood. They may appear mild at first, but they are unpredictable. They rise quickly, often...