If the water is at least 79☏, a hurricane might form. A tropical depression is a line of rain showers and weak thunderstorms that circle around an area of low air pressure. Hurricanes begin when a tropical depression forms in the ocean. During these times, oceans have warmer water, which is what a hurricane needs to form. In the Southern Hemisphere (the area south of the equator), storm season is between April and December, with peak storm activity around May and November. In the Northern Hemisphere (the part of Earth north of the equator), hurricanes generally occur between mid-August to late October. Hurricanes are strong storms that start in the ocean and have winds of at least 74 miles an hour. As many as 150 occur around the world each year. Scientists know them all as tropical cyclones. In the western Pacific Ocean, they’re known as typhoons in the southern Pacific and Indian Oceans, they’re called cyclones. They’re called hurricanes if they occur in the Atlantic Ocean, Caribbean Sea, Gulf of Mexico, and eastern Pacific Ocean. These powerful storms have different names depending on where in the world they form. Even sharks are heading out to calmer waters. The wind at the beach is whipping at 95 miles an hour.
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