Hurricanes are truly an impressive and enormous force of nature. The strongest ones lay waste to thousands of homes and properties, and devastates so many lives. So how do hurricanes form, anyway? Hurricanes, or a tropical cyclone in scientific terms, start out only over warm ocean waters near the equator. This is because hurricanes use warm, moist air as fuel.
Hurricanes are formed when warm, moist air over the ocean rises upward, and as it does, an area of lower air pressure is created below. Because the air pressure below is low, air from surrounding areas with higher air pressure moves into the area of lower air pressure, a normalizing natural reaction of nature to keep pressures at normal and equal levels. As the air from areas of higher air pressure moves into the area of lower air pressure, the newer air becomes warm as well, and also rises. This process continues for a time. The warmed air rises, and soon it begins to cool off, and the water in the air forms clouds. This continues to grow and spin faster, fed by the continual rising of heated, warm air. When the wind speeds reach 74mph, a hurricane is formed.
Check this link for a video clip on the formation of the infamous hurricane Katrina.
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