Hurricanes begin when there is a low pressure system in warm tropical oceans. The right combination of barometric pressure, wind circulation and thunderstorms creates strong winds, heavy rain, large waves and flooding. This disturbance is then classified as a tropical depression, tropical storm, or hurricane. Classification is based on how fast/strong the maximum sustained winds are. Hurricanes have maximum sustained winds of 74 mph or higher and a well-defined center of circulation.
Most hurricanes lose intensity rapidly after making landfall because landforms, buildings and other obstacles "slow it down" by removing the things it loves (low pressures, open spaces, light winds and warm water. So, the storm has less chance to regenerate on land. As a result it loses power and energy. Unfortunately, the power and energy are often transformed into excessive thunderstorms resulting in flooding and the damage it causes.
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