Yellow and orange are the warm ocean waters, and blue and white are the hurricane's tall, cool cloud tops. NASA's Terra satellite captured this thermal (heat) image of Category 5 Hurricane Maria in 2017. Now, the growing, swirling vortex of air and clouds grows and grows and can become a thunderstorm. Once this hot air gets high enough into the atmosphere, it cools off and condenses into clouds. This process repeats as air from higher pressure areas moves into the lower pressure area, heats up, and rises, in turn, producing swirls in the air, according to NASA (opens in new tab). As the hot air rises, it leaves a lower pressure region below it. At heart, hurricanes are fueled by just two ingredients: heat and water. Hurricanes are seeded over the warm waters above the equator, where the air above the ocean's surface takes in heat and moisture.
Hurricanes are the most violent storms on Earth, according to NASA. Tropical Storm Alex: June 5, north of the Abaco Islands, in the northern Bahamas.Category 5: 157 mph or higher (252 km/h or higher).According to the Saffir-Simpson scale, here are the sustained winds linked to categories 2 through 5 hurricanes: Once those sustained winds reach 74 to 95 mph (119 to 153 km/h), that storm becomes a Category 1 hurricane. When a tropical cyclone's sustained winds reach 39 to 73 mph (63 to 118 km/h), it is considered a tropical storm and it gets a name from a list put out by the World Meteorological Organization.
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