Tropical cyclones form over warm ocean waters that exceed 26.5 degrees Celsius or 80 degrees Fahrenheit.The process begins when warm, moist air rises from the ocean surface.As this warm air rises, it creates an area of low pressure near the ocean surface.The rising air cools as it ascends, leading to cloud formation.Earth's rotation causes the surrounding air to be pulled into a spiral pattern.The storm develops distinct features: a calm eye at the center, surrounded by the eyewall containing the strongest winds and rain.Spiral rainbands extend outward from the center, forming the characteristic spiral arms of the storm.This rotating system continues to strengthen as long as conditions remain favorable.Tropical cyclones are classified into different categories based on their wind speeds.The weakest form is a tropical depression, with winds below 39 miles per hour.When winds reach 39 to 73 miles per hour, it becomes a tropical storm.At 74 miles per hour or higher, the system becomes a hurricane or typhoon, depending on its location.Hurricanes are further classified using the Saffir-Simpson scale, which ranges from Category 1 to Category 5.These powerful storms are given different names depending on where they form.In the Atlantic and Eastern Pacific, they're called hurricanes.In the Western Pacific, they're known as typhoons.And in the Indian Ocean, they're simply called cyclones.Tropical cyclones bring three major hazards that can devastate coastal communities.First, destructive winds can severely damage or destroy buildings and infrastructure.Second, storm surge pushes walls of water inland, causing severe coastal flooding.Third, these storms bring heavy rainfall that can cause widespread inland flooding.Tropical cyclones follow predictable movement patterns, typically moving west-northwest in tropical regions.As they move poleward, the storms often curve to the right in the Northern Hemisphere.The storms begin to weaken when they move over land or cooler water, as they lose their energy source of warm ocean water.Meteorologists use this understanding of storm movement to forecast potential paths and warn communities that may be in danger.
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