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Hurricane Research Division

version 4.0
August 13, 2004

A : BASIC DEFINITIONS

A1) What is a hurricane, typhoon, or tropical cyclone?
A2) What is a "Cape Verde" hurricane?
A3) What is a super-typhoon? What is a major hurricane ? What is an intense hurricane ?
A4) What is an easterly wave ?
A5) What is a tropical disturbance, tropical depression, or a tropical storm ? New
A6) What is a sub-tropical cyclone?
A7) What is an extra-tropical cyclone ?Updated
A8) What is storm surge and how is it different from tidal surge ?
A9) What is a "CDO" ?
A10) What is a "TUTT"?
A11) What is the "eye" ? How is it formed and maintained ? What is the "eyewall" ? What are "spiral bands" ?
A12) What is a moat in a hurricane ?
A13) What is UTC ? How can I tell at what time a satellite picture was taken ?New
A14) How do I convert from mph to knots or meters per second, from inches of mercury to millibars, or degrees of latitude to miles (or kilometers) ?
A15) How do tropical cyclones form ?
A16) Why do tropical cyclones require at least 80°F ocean temperatures to form ?
A17) What is the Saharan Air Layer (SAL) ? How does it affect tropical cyclones ?

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