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Causes. There are two main factors that are responsible for causing hurricane storms, viz. warm water and moist, warm air. This is the reason why they begin in tropical regions. They occur when the moist, warm air from the surface of the ocean rises and meets the cooler air.
Cause and Effect-Short Passages Answer Key. 1. Hurricanes begin when the weather conditions are just right for a cluster of thunderstorms to form over a tropical ocean. If such a cluster remains long enough, it organizes into a tropical depression, with winds of up to 42 miles per hour. If a tropical depression increases to winds of 43 to 74 miles per hour, it is a tropical storm.