This is a diagram caption that lists components of what causes a hurricane
This picture shows an area that has been affected by hurricane Sandy
Cause
Hurricanes are very dangerous and can cause many casualties, injuries, and collateral damage. Now, you might wonder how can a hurricane generate so much force and power. Warm air and moist warm air are the two most important factors that cause a hurricane. When cool air meets moist, warm air from the surface of an ocean, a hurricane occurs. The moist, warm air then condensates and forms raindrops and storm clouds. Since it takes energy to make clouds (condensation), heat is released and the cooler air above gets hotter. Warm, humid air from the ocean collects and joins into the progressing storm. Therefore, there is a heat transfer to the atmosphere from the surface of the ocean. The "eye" of the hurricane is where a wind pattern is formed that makes a spiral motion. This "eye", is formed by the exchange of heat between the surface of the ocean and the atmosphere. Wind from other regions merge with the developing storm. This causes an unstable wind speed and an increase in the circulation of warm, humid air. The storm then swirls into a typical cyclone pattern because of all those winds that pull away the rising warm air from the "eye".
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Effect Tornadoes, strong winds, inland flooding, and storm surges are all effects of hurricanes. Storm surge is the quick increase of the water level that comes on the land. Strom surge is responsible for 90% of deaths related to hurricanes. If there are higher wind speeds then there is more force, more damage, and the storm surge is more effective. Hurricane storms have caused less deaths than inland flooding. The average for rainfall is 5-10 inches which is common. Usually, the rainfall increases, but that depends on the type of storm. Tornadoes may form after hurricanes, but they are only at the lowest strength.