Title: Hurricanes
1Hurricanes
- Hurricane
- North Atlantic Ocean, North East Pacific Ocean
East of dateline, or South Pacific Ocean East of
160 E - Typhoon
- NW Pacific Ocean West of dateline
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3Low pressure at the surface pulls air in
counter-clockwise.High pressure aloft expels the
air in a clockwise direction.
4Winds are breezy at the edge of the storm and
increase to a maximum in the eyewall. Winds are
relatively light in the eye itself.
5Hurricane facts
- Tropical storms need 50 meters of warm water
(26.5 degrees Celcius) to grow - The warm water evaporates into the storm,
releasing the stored heat energy when it
condenses - The average hurricane uses as much energy in a
day as the entire US in 6 months - Hurricanes help maintain the heat balance of the
Earth - Hurricanes can not be stopped with nuclear
weapons or cloud seeding - Hurricanes move with large currents of air in the
atmosphere. The direction of the storm is not
altered by land masses.
6Hurricane Formation Conditions
- Water temperature of 26.5 oC
- 50 m depth of warm water
- Moist air
- Calm - very little wind
- 500 km from the equator so that the Coriolis
Effect works!
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8Warm ocean waters of at least 26.5 C Warm, humid
airRelatively moist layers near mid-troposphere
(5 km)Minimum distance of at least 500 km from
equator
91 tropical disturbance 2 tropical depression 3
tropical storm 4 hurricane
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11Wind blows the clouds clockwise start pulling
up ocean water. Then the bottom water moves
counterclockwise
12Air sinks into the centre (the eye).
13Wind spins around the eye, where hurricane is the
strongest.
14As the wind flows higher it becomes weaker and
flows clockwise.
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16High winds
17Storm damage
18flooding
19Tornado formation
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21Resources
- Gerry Bell Hurricanes
- NOAA
- NASA