Translate:
English
Chinese (S)
Chinese (T)
Croatian
Dutch
French
German
Hebrew
Italian
Japanese
Korean
Portuguese
Russian
Serbian
Spanish
Swedish
Turkish
Additional
cyclone
English Wikipedia - The Free Encyclopedia
Download this dictionary
Cyclone
In
meteorology
, a
cyclone
is an area of closed, circular fluid motion rotating in the same direction as the
Earth
. This is usually characterized by inward
spiraling
winds
that rotate
counterclockwise
in the
Northern Hemisphere
and
clockwise
in the
Southern Hemisphere
of the Earth. Most large-scale cyclonic circulations are centered on areas of
low atmospheric pressure
. The largest low-pressure systems are
cold-core
polar cyclones and
extratropical cyclones
which lie on the
synoptic scale
. According to the
National Hurricane Center
glossary, warm-core cyclones such as
tropical cyclones
and
subtropical cyclones
also lie within the synoptic scale.
Mesocyclones
,
tornadoes
and
dust devils
lie within the smaller
mesoscale
. Upper level cyclones can exist without the presence of a surface low, and can pinch off from the base of the
Tropical Upper Tropospheric Trough
during the summer months in the Northern Hemisphere. Cyclones have also been seen on extraterrestrial planets, such as
Mars
and
Neptune
.
Cyclogenesis
describes the process of cyclone formation and intensification.
Extratropical cyclones
form as waves in large regions of enhanced mid-latitude temperature contrasts called
baroclinic zones
. These zones contract to form
weather fronts
as the cyclonic circulation closes and intensifies. Later in their life cycle, cyclones
occlude
as cold core systems. A cyclone's track is guided over the course of its 2 to 6 day life cycle by the steering flow of the cancer or subtropical
jet stream
.
See more at Wikipedia.org...
Cyclone!
Cyclone!
was an
Australian
superhero
anthology comic book originally published in 1985.
See more at Wikipedia.org...
© This article uses material from
Wikipedia
®
and is licensed under the
GNU Free Documentation License
and under the
Creative Commons Attribution-ShareAlike License