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  • - [Narrator] Cyclone, typhoon, hurricane.

  • All of these names are used around the world to describe the most powerful storm known to man.

  • Hurricanes are unpredictable but scientists have a thorough understanding of how hurricanes form and sustain their power.

  • In the Atlantic Ocean, hurricane season peaks during the late summer months when tropical waters are the warmest.

  • Hurricanes form from a cluster of thunderstorms that suck up the warm, moist air and move it high into Earth's atmosphere.

  • The warm air is then converted into energy that powers the hurricane's circular winds.

  • These winds spin around a low-pressure center called the eye.

  • Which can provide a 20 to 30 mile radius of eerie calm.

  • Encircling it is the eye wall, a towering ring of clouds with some of the fastest wind-speeds of the hurricane.

  • Surrounding the eye wall are curved bands of clouds.

  • The rainbands, often tens of miles wide releasing sheets of rain and sometimes tornadoes.

  • When a tropical storm's winds reach at least 74 miles per hour, it becomes a hurricane.

  • The hurricane then receives the category ranking of one to five on the Saffir-Simpson Scale based on its wind speed and potential damage.

  • But wind speed isn't always the most dangerous component when hurricanes come near land.

  • It's storm surge.

  • Storm surge is caused when winds from an approaching hurricane push water towards the shoreline up to 20 feet above sea level and can extend 100 miles.

  • 90% of all hurricane deaths are the result of storm surge.

  • While hurricanes can cause mass devastation, just like other natural disasters, they serve a higher purpose within the global ecosystem.

  • Hurricanes help regulate our climate by moving heat energy from the equator to the poles keeping the Earth's temperature stable.

  • Over time, science has helped us to better understand hurricanes and predict their paths.

  • Saving lives through early warning systems and helping us build better infrastructure to protect our cities.

  • The more we study these complex storms, the better we can prepare for them and minimize their impact on human lives.

- [Narrator] Cyclone, typhoon, hurricane.

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颶風101|國家地理 (Hurricanes 101 | National Geographic)

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    yunfeicheng1 發佈於 2021 年 01 月 14 日
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