Delineations

Saturday, August 06, 2005

Cyclone
1. An air mass circulating inward around a low-pressure center (counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere). 2. A violent rotating windstorm.

Tropical storm
A cyclonic storm with winds from 30 to 73 miles per hour.

Hurricane
A severe tropical storm with winds of at least 74 miles per hour. 

Typhoon 
A hurricane in the western Pacific, South China Sea, or Indian Ocean.

Monsoon
Periodic wind, or the rain or season associated with it.

Tornado
A violently rotating air column in contact with the ground and extending to the base of a thunderstorm.

Waterspout
A tornado over water.

Twister
A tornado or cyclone.

Whirlwind
A spinning vertical column of air.

Dust Devil
A whirlwind with dust or debris.

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