What are Hurricanes? | How do they form and cause Damage?

Even as Hurricane Harvey left Texas bruised and Hurricane Irma began lashing Florida. Nasa Scientist have explained how Hurricanes are formed.

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What are hurricanes? 

Hurricanes are a part of a family of storms called, tropical cyclones storms that rotate rapidly around a low-pressure center and produce heavy rain and strong winds. If one of these storms hits a sustained top wind speed of 119 kilometers an hour and appears in the Atlantic or eastern North Pacific, it qualifies as a hurricane.

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How do hurricanes form? 

Hurricanes begin as atmospheric disturbances over the tropical waters in west of Africa near the Cape Verde islands. Typically, when sea-surface temperatures are above 26.5 C, water vapor from the ocean condenses and releases heat, which rises and generates an inward movement of air. The air begins to spiral toward the center of the disturbance, which graduates to a tropical depression and then a tropical storm. As long as winds in the upper atmosphere do not produce a shear force to warp the system, it can increase in height and breadth until it reaches the hurricane status, gaining strength as it moves westward  toward the Caribbean and picking up energy from the warm Atlantic waters. 

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How do they Cause damage? 

Hurricanes may cause damage in one of three main ways Wind, Rain and Storm surge. Hurricanes has the power to destroy anything on there way with there powerful winds. Lashing winds are perhaps the most common risk associated with hurricanes. 

The combined economic cost of Hurricanes Harvey and Irma could reach $290 billion, equivalent to 1.5 percent of the US gross domestic product. US forecaster AccuWeather said in there report.