What a Hurricane Needs to Develop

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1 Massive Storms!

2 Hurricanes

3

4 What a Hurricane Needs to Develop

5 Warm tropical water - at least 80 F High Humidity Light wind Low Pressure Area Form between 5 and 20 latitude Hurricane Ingredients

6 Hurricane Formation As water evaporates from warm ocean waters this warm, moist air (less dense) rises in the atmosphere, leaving less air near the surface, and forming a low pressure area Hurricane Formation

7 Hurricane Formation As more ocean water evaporates and fuels the hurricane, the low pressure at the surface will get stronger and it will spin faster, leading to higher sustained wind speeds How Hurricanes Form

8 Inside the Hurricane

9 Hurricanes need warm water to form so they form near the equator, but not on it. Why?

10 Hurricanes turn to the right away from the equator because of the Coriolis Effect caused by Earth s rotation.

11 Hurricanes, typhoons and cyclones oh my! Hurricanes, cyclones, and typhoons are all the same weather phenomenon; we just use different names for these storms in different places. Called a Hurricane in the Atlantic and Northeast Pacific Typhoon in the Northwest Pacific Cyclones occur in the South Pacific and Indian Ocean. If the right conditions persist long enough, violent winds, incredible waves, torrential rains, and floods are created.

12 When hurricanes reach land:

13 Hurricanes weaken as they move over land They lose their source of heat and moisture Friction over land also reduces the circulation of surface winds, weakening a hurricane Hurricane Weakening

14 Famous Hurricanes Off the Texas coast Galveston: 1900 Known as "the Galveston Hurricane," the deadliest hurricane disaster in U.S. history occurred on September 8. More than 8,000 people died More than half of all the homes and buildings were destroyed.

15

16 Monsoons Monsoons are seasonal shifts in the prevailing wind direction, that usually brings with it a different kind of weather. It almost always refers to the Asian monsoon, a large region extending from India to Southeast Asia

17 Monsoons blow from the land toward the sea in winter, and from the sea toward land in the summer Runs from June to September Intense period of heavy rain, booming thunder, and plenty of lightening Monsoon Animation

18

19 El Niño

20 Abnormally high surface ocean temperatures off the coast of South America Causes unusual weather patterns across the globe Occur every 2 7 years

21 El Nino Starts because the easterly trade winds weaken and allow the warm waters in the Western Pacific to move east toward South America

22 El Nino This changes where the convection current occurs Causing rain where it usually doesn't occur and drought where it usually rains

23 La Nina After the El Nino phase, the La Nina follows Abnormally Low surface ocean temperatures off the coast of South America Causes unusual weather patterns across the globe

24

25 EL NINO Weaker Trade Winds warm water spreads out Equal condensation & precipitation throughout Compared to Normal, there is LESS precipitation near Asia and MORE by the Americas Animation NORMAL/LA NINA Strong Trade Winds More warm water near Asia more condensation more precipitation

26 El Nino and La Nina Explained Watch video: vity/the-ocean-and-weather-el-nino-and-la-nina/?ar_a=1

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