Eye: The roughly circular area of comparatively light winds that
encompasses the center of a severe tropical cyclone. The eye is
either completely or partially surrounded by the eyewall cloud.
Eyewall / Wall Cloud: An organized band or ring of cumulonimbus
clouds that surround the eye, or light-wind center of a tropical
cyclone. Eyewall and wall cloud are used synonymously.
Extratropical: A term used to indicate that a cyclone has lost
its "tropical" characteristics. The term implies both poleward
displacement of the cyclone and the conversion of the cyclone's
primary energy source from the release of energy from
evaporating ocean water to the temperature contrast between warm
and cold air masses. It is important to note that cyclones can
become extratropical and still retain winds of hurricane or
tropical storm force. Fujiwhara Effect: The tendency of two
nearby tropical cyclones to rotate cyclonically about each
other. Gale Warning: A warning of 1-minute sustained surface
winds in the range 39 mph (34 kts.)