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Mesocyclones are believed to form when strong changes of wind speed and/or direction with height ("[[wind shear]]") sets parts of the lower part of the atmosphere spinning in invisible tube-like rolls. The convective updraft of a thunderstorm is then thought to draw up this spinning air, tilting the rolls' orientation upward (from parallel to the ground to perpendicular) and causing the entire updraft to rotate as a vertical column. Mesocyclones are normally relatively localized: they lie between the [[Synoptic scale meteorology|synoptic scale]] (hundreds of kilometers) and microscale (hundreds of meters). Radar imagery is used to identify these features.<ref>Roger Edwards. [http://www.spc.ncep.noaa.gov/faq/tornado/ The Online Tornado FAQ: Frequently Asked Questions About Tornadoes.] Retrieved on [[2008-06-14]].</ref>
Mesocyclones are believed to form when strong changes of wind speed and/or direction with height ("[[wind shear]]") sets parts of the lower part of the atmosphere spinning in invisible tube-like rolls. The convective updraft of a thunderstorm is then thought to draw up this spinning air, tilting the rolls' orientation upward (from parallel to the ground to perpendicular) and causing the entire updraft to rotate as a vertical column. Mesocyclones are normally relatively localized: they lie between the [[Synoptic scale meteorology|synoptic scale]] (hundreds of kilometers) and microscale (hundreds of meters). Radar imagery is used to identify these features.<ref>Roger Edwards. [http://www.spc.ncep.noaa.gov/faq/tornado/ The Online Tornado FAQ: Frequently Asked Questions About Tornadoes.] Retrieved on [[2008-06-14]].</ref>


Ohhh lala bryson loves tyson <3
==Types==
There are six main types of cyclones: [[Polar cyclone]]s, [[Polar low]]s, [[Extratropical cyclone]]s, [[Subtropical cyclone]]s, [[Tropical cyclone]]s, and [[Mesocyclone]]s.

===Polar cyclone===
{{main|Polar cyclone}}
Polar, sub-polar, or Arctic cyclones (also known as the polar vortex)<ref name = "glossvortex"/> are vast areas of low pressure which stengthen in the winter and weaken in the summer.<ref>Halldór Björnsson. [http://andvari.vedur.is/~halldor/HB/Met210old/GlobCirc.html Global circulation.] Retrieved on [[2008-06-15]].</ref> A polar cyclone is a low pressure [[weather system]], usually spanning {{convert|1000|km|mi}} to {{convert|2000|km|mi}}, in which the air circulates in a counterclockwise direction in the northern hemisphere, and a clockwise direction in the southern hemisphere. In the Northern Hemisphere, the polar cyclone has two centers on average. One center lies near Baffin Island and the other over northeast Siberia.<ref name="glossvortex">Glossary of Meteorology. [http://amsglossary.allenpress.com/glossary/search?id=polar-vortex1 Polar vortex.] Retrieved on [[2008-06-15]].</ref> In the southern hemisphere, it tends to be located near the edge of the [[Ross ice shelf]] near 160 west longitude.<ref>Rui-Rong Chen, Don L. Boyer, and Lijun Tao. [http://ams.allenpress.com/perlserv/?request=get-abstract&doi=10.1175%2F1520-0469(1993)050%3C4058%3ALSOAMI%3E2.0.CO%3B2&ct=1 Laboratory Simulation of Atmospheric Motions in the Vicinity of Antarctica.] Retrieved on [[2008-06-15]].</ref> When the polar vortex is strong, westerly flow descends to the earth's surface. When the polar cyclone is weak, significant cold outbreaks occur.<ref>James E. Kloeppel. [http://www.news.uiuc.edu/scitips/01/12weather.html Stratosheric polar vortex influences winter cold, researchers say.] Retrieved on [[2008-06-15]].</ref>

===Polar low===
{{main|Polar low}}
A polar low is a small-scale, short-lived atmospheric [[low pressure area|low pressure system]] (depression) that is found over the ocean areas poleward of the main [[polar front]] in both the Northern and Southern Hemispheres. The systems usually have a horizontal length scale of less than {{convert|1000|km|mi}} and exist for no more than a couple of days. They are part of the larger class of [[mesoscale meteorology|mesoscale]] weather systems. Polar lows can be difficult to detect using conventional weather reports and are a hazard to high-latitude operations, such as shipping and gas and oil platforms. Polar lows have been referred to by many other terms, such as polar mesoscale vortex, Arctic hurricane, Arctic low, and cold air depression. Today the term is usually reserved for the more vigorous systems that have near-surface winds of at least 17 m/s.<ref>Rasmussen,E.A. and Turner, J.(2003). Polar Lows: Mesoscale Weather Systems in the Polar Regions, Cambridge University Press, Cambridge, pp 612.</ref>

===Extratropical===
[[Image:UK-Cyclone.gif|thumb|right|250px|A fictitious synoptic chart of an extratropical cyclone affecting the UK and Ireland. The blue arrows between [[isobars]] indicate the direction of the wind, while the "L" symbol denotes the centre of the "low". Note the occluded, cold and warm [[Surface weather analysis|frontal boundaries]].]]
{{main|Extratropical cyclone}}
An extratropical cyclone is a [[Synoptic scale meteorology|synoptic scale]] [[Low pressure area|low pressure]] weather system that has neither [[tropical cyclone|tropical]] nor [[polar cyclone|polar]] characteristics, being connected with [[Surface weather analysis|fronts]] and horizontal [[gradients]] in [[temperature]] and [[dew point]] otherwise known as "baroclinic zones".<ref name="ExtraLessonMillUni"> {{cite web
| title = ESCI 241 – Meteorology; Lesson 16 – Extratropical Cyclones
| author = Dr. DeCaria
| publisher = [http://muweb.millersville.edu/~esci/ Department of Earth Sciences, Millersville University, Millersville, Pennsylvania]
| date = [[2005-12-07]]
| url = http://www.atmos.millersville.edu/~adecaria/ESCI241/esci241_lesson16_cyclones.html
| accessdate = 2006-10-21 }} </ref>

The descriptor "extratropical" refers to the fact that this type of cyclone generally occurs outside of the tropics, in the middle latitudes of the planet. These systems may also be described as "mid-latitude cyclones" due to their area of formation, or "post-tropical cyclones" where [[Extratropical cyclone#Extratropical transition|extratropical transition]] has occurred,<ref name="ExtraLessonMillUni">ExtraLessonMillUni</ref><ref name="ExtratropicalPhases">{{cite web
| title = Synoptic Composites of the Extratropical Transition Lifecycle of North Atlantic TCs as Defined Within Cyclone Phase Space
| author = Robert Hart and Jenni Evans
| publisher = [http://ams.confex.com/ American Meteorological Society]
| date = 2003
| url = http://ams.confex.com/ams/pdfpapers/70524.pdf
| accessdate = 2006-10-03 }}</ref> and are often described as "depressions" or "lows" by weather forecasters and the general public. These are the everyday phenomena which along with [[anti-cyclone]]s, drive the weather over much of the Earth.

Although extratropical cyclones are almost always classified as [[baroclinic]] since they form along zones of temperature and dewpoint gradient, they can sometimes become [[barotropic]] late in their life cycle when the temperature distribution around the cyclone becomes fairly uniform with radius.<ref>Ryan N. Maue. [http://www.coaps.fsu.edu/~maue/cyclone_ch3.html CHAPTER 3: CYCLONE PARADIGMS AND EXTRATROPICAL TRANSITION CONCEPTUALIZATIONS.] Retrieved on [[2008-06-15]].</ref> An extratropical cyclone can transform into a subtropical storm, and from there into a tropical cyclone, if it dwells over warm waters and develops central convection, which warms its core.<ref name = "AOML FAQ A7">{{cite web | author = [[Atlantic Oceanographic and Meteorological Laboratory]], Hurricane Research Division | title = Frequently Asked Questions: What is an extra-tropical cyclone?|publisher = [[NOAA]] | accessdate = 2006-07-25 | url = http://www.aoml.noaa.gov/hrd/tcfaq/A7.html}}</ref>



===Subtropical===
[[Image:Subtropical Storm Andrea 2007.jpg|thumb|200px|right|[[Subtropical Storm Andrea (2007)|Subtropical Storm Andrea]] in [[2007 Atlantic hurricane season|2007]]]]
{{main|Subtropical cyclone}}
A subtropical cyclone is a [[weather]] system that has some characteristics of a [[tropical cyclone]] and some characteristics of an [[extratropical cyclone]]. They can form between the equator and the 50th parallel.<ref name = "A6"/> As early as the 1950s, meteorologists were unclear whether they should be characterized as tropical cyclones or extratropical cyclones, and used terms such as quasi-tropical and semi-tropical to describe the cyclone hybrids.<ref>David B. Spiegler. [http://docs.lib.noaa.gov/rescue/mwr/101/mwr-101-04-0380.pdf Reply.] Retrieved on [[2008-04-20]].</ref> By 1972, the [[National Hurricane Center]] officially recognized this cyclone category.<ref>R. H. Simpson and Paul J. Hebert. [http://www.aoml.noaa.gov/general/lib/lib1/nhclib/mwreviews/1972.pdf Atlantic Hurricane Season of 1972.] Retrieved on [[2008-06-14]].</ref> Subtropical cyclones began to receive names off the official tropical cyclone list in the Atlantic Basin in 2002.<ref name = "A6"/> They have broad wind patterns with maximum sustained winds located farther from the center than typical tropical cyclones, and exist in areas of weak to moderate temperature gradient.<ref name="A6">[[Chris Landsea]]. [http://www.aoml.noaa.gov/hrd/tcfaq/A6.html Subject: A6) What is a sub-tropical cyclone?] Retrieved on [[2008-06-14]].</ref>

Since they form from initially extratropical cyclones which have colder temperatures aloft than normally found in the tropics, the sea surface temperatures required for their formation are lower than the tropical cyclone threshold by three degrees [[Celsius]], or five degrees [[Fahrenheit]], lying around 23&nbsp;degrees Celsius.<ref name="HistSubTropCyclones">{{cite web
| title = A Fifty year History of Subtropical Cyclones
| author = David Mark Roth
| publisher = [http://www.hpc.ncep.noaa.gov/ Hydrometeorological Prediction Center]
| date = 2002-02-15
| url = http://www.hpc.ncep.noaa.gov/research/roth/Subpreprint.pdf
| accessdate = 2006-10-04 }}</ref> This means that subtropical cyclones are more likely to form outside the traditional bounds of the hurricane season. Although subtropical storms rarely have hurricane-force winds, they may become tropical in nature as their cores warm.<ref name = "AOML FAQ A6">{{cite web | author = [[Atlantic Oceanographic and Meteorological Laboratory]], Hurricane Research Division | title = Frequently Asked Questions: What is a sub-tropical cyclone?|publisher = [[NOAA]] | accessdate = 2006-07-25 | url = http://www.aoml.noaa.gov/hrd/tcfaq/A6.html}}</ref>

===Tropical===
[[Image:Cyclone Catarina from the ISS on March 26 2004.JPG|thumb|250px|[[Cyclone Catarina]], a rare [[South Atlantic tropical cyclone]] viewed from the [[International Space Station]] on [[March 26]] [[2004]]]]
{{main|Tropical cyclone}}
A tropical cyclone is a [[storm|storm system]] characterized by a [[low pressure system|low pressure]] center and numerous [[thunderstorms]] that produce strong winds and [[flood]]ing [[rain]]. A tropical cyclone feeds on heat released when moist [[air]] rises, resulting in [[condensation]] of [[water vapour]] contained in the moist air. They are fueled by a different heat mechanism than other cyclonic windstorms such as [[nor'easter]]s, [[European windstorm]]s, and [[polar low]]s, leading to their classification as "warm core" storm systems.<ref name = "AOML FAQ A7">{{cite web | author = [[Atlantic Oceanographic and Meteorological Laboratory]], Hurricane Research Division | title = Frequently Asked Questions: What is an extra-tropical cyclone? | publisher = [[NOAA]] | accessdate = 2007-03-23 | url = http://www.aoml.noaa.gov/hrd/tcfaq/A7.html}}</ref>

The term "tropical" refers to both the geographic origin of these systems, which form almost exclusively in [[tropics|tropical]] regions of the globe, and their formation in [[Air mass#Classification|Maritime Tropical air masses]]. The term "cyclone" refers to such storms' cyclonic nature, with [[Clockwise and counterclockwise|counterclockwise]] rotation in the [[Northern Hemisphere]] and clockwise rotation in the [[Southern Hemisphere]]. Depending on their location and strength, tropical cyclones are referred to by other names, such as hurricane, typhoon, tropical storm, cyclonic storm, tropical depression, or simply as a cyclone. ''Generally'' speaking, a tropical cyclone is referred to as a [[hurricane|hurricane]] (from the name of the ancient Central American deity of wind, Hunrakkan) in the Atlantic basin, and a Cyclone in the Pacific. <ref name="NHC glossary">{{cite web | author = [[National Hurricane Center]] | url = http://www.nhc.noaa.gov/aboutgloss.shtml | year = 2005 | title = Glossary of NHC/TPC Terms | accessdate= 2006-11-29 | publisher = [[National Oceanic and Atmospheric Administration]]}}</ref>

While tropical cyclones can produce extremely powerful winds and torrential [[rain]], they are also able to produce high waves and damaging [[storm surge]].<ref name="oxfo">{{cite web|author=James M. Shultz, Jill Russell and Zelde Espinel|year=2005|title=Epidemiology of Tropical Cyclones: The Dynamics of Disaster, Disease, and Development|publisher=Oxford Journal|accessdate=2007-02-24|url=http://epirev.oxfordjournals.org/cgi/content/full/27/1/21}}</ref> They develop over large bodies of warm water,<ref name = "AOML FAQ A15">{{ cite web | author = [[Atlantic Oceanographic and Meteorological Laboratory]], Hurricane Research Division | title = Frequently Asked Questions: How do tropical cyclones form? | publisher = [[NOAA]] | accessdate = 2006-07-26 | url = http://www.aoml.noaa.gov/hrd/tcfaq/A15.html}}</ref> and lose their strength if they move over land.<ref>[[National Hurricane Center]]. [http://www.aoml.noaa.gov/hrd/tcfaq/C2.html Subject : C2) Doesn't the friction over land kill tropical cyclones?] Retrieved on [[2008-02-25]].</ref> This is the reason coastal regions can receive significant damage from a tropical cyclone, while inland regions are relatively safe from receiving strong winds. Heavy rains, however, can produce significant flooding inland, and storm surges can produce extensive coastal [[flood]]ing up to {{convert|40|km|mi}} from the coastline. Although their effects on human populations can be devastating, tropical cyclones can also relieve [[drought]] conditions.<ref name="2005 EPac outlook">[[National Oceanic and Atmospheric Administration]]. [http://www.cpc.ncep.noaa.gov/products/Epac_hurr/Epac_hurricane.html 2005 Tropical Eastern North Pacific Hurricane Outlook.] Retrieved on [[2006-05-02]].</ref> They also carry heat and energy away from the tropics and transport it toward [[temperate]] [[latitudes]], which makes them an important part of the global [[atmospheric circulation]] mechanism. As a result, tropical cyclones help to maintain equilibrium in the Earth's [[troposphere]], and to maintain a relatively stable and warm temperature worldwide.

Many tropical cyclones [[tropical cyclogenesis|develop]] when the atmospheric conditions around a weak disturbance in the atmosphere are favorable. Others form when [[#Related cyclone types|other types of cyclones]] acquire tropical characteristics. Tropical systems are then moved by [[#Steering winds|steering winds]] in the [[troposphere]]; if the conditions remain favorable, the tropical disturbance intensifies, and can even develop an [[eye (cyclone)|eye]]. On the other end of the spectrum, if the conditions around the system deteriorate or the tropical cyclone makes landfall, the system weakens and eventually dissipates. A tropical cyclone can become extratropical as it moves toward higher latitudes if its energy source changes from heat released by condensation to differences in temperature between air masses;<ref name = "AOML FAQ A7">{{cite web | author = [[Atlantic Oceanographic and Meteorological Laboratory]], Hurricane Research Division | title = Frequently Asked Questions: What is an extra-tropical cyclone?|publisher = [[NOAA]] | accessdate = 2006-07-25 | url = http://www.aoml.noaa.gov/hrd/tcfaq/A7.html}}</ref> From an operational standpoint, a tropical cyclone is usually not considered to become subtropical during its extratropical transition.<ref name=PadgetDecember2000>{{cite web | author = Padgett, Gary | url = http://australiasevereweather.com/cyclones/2001/summ0012.htm | title = Monthly Global Tropical Cyclone Summary for December 2000 | year = 2001 | accessdate = 2006-03-31}}</ref>

===Mesoscale===
[[Image:Greensburg3 small.gif|thumb|A mesocyclone from the [[May 2007 Tornado Outbreak|Greensburg, Kansas tornado]] indicated on [[Doppler effect|Doppler]] [[weather radar]].]]
{{main|Mesocyclone}}
A mesocyclone is a [[vortex]] of air, approximately {{convert|2|km|mi}} to {{convert|10|km|mi}} in diameter (the [[mesoscale]] of meteorology), within a [[convection|convective]] [[storm]].<ref name="MesocyloneDef"> {{cite web| title = American Meteorological Society Glossary - Mesocyclone
| publisher = [http://www.allenpress.com Allen Press Inc.]
| date = 2000-06
| url = http://amsglossary.allenpress.com/glossary/search?id=mesocyclone1
| accessdate = 2006-12-07 }}</ref>
Air rises and rotates around a vertical axis, usually in the same direction as low pressure systems in a given hemisphere. They are most often cyclonic, that is, associated with a localized low-pressure region within a [[severe thunderstorm]].<ref>[[National Weather Service]] Forecast Office State College, Pennsylvania. [http://www.erh.noaa.gov/ctp/features/2006/07_10/ Splitting Storm and Anti-cyclonic Rotating Mesocyclone in a Thunderstorm over Elk County July 10th, 2006.] Retrieved on [[2008-06-15]].</ref> Such storms can feature strong surface winds and severe [[hail]]. Mesocyclones often occur together with updrafts in [[supercell]]s, where [[tornado]]es may form. About 1700 mesocyclones form annually across the [[United States]], but only half produce tornadoes.<ref name="FoN">Forces of Nature. [http://library.thinkquest.org/C003603/english/tornadoes/themesocyclone.shtml Tornadoes : the mesocyclone.] Retrieved on [[2008-06-15]].</ref>


==Extraterrestrial cyclones==
==Extraterrestrial cyclones==

Revision as of 02:11, 27 October 2008

For other uses, see the meteorological phenomenon.
Polar low over the Barents Sea on February 27, 1987

In meteorology, a cyclone refers to an area of closed, circular fluid motion rotating in the same direction as the Earth[1][2]. This is usually characterized by inward spiraling winds that rotate counter clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere of the Earth.

Large-scale cyclonic circulations are almost always centered on areas of low atmospheric pressure[3][4]. The largest low-pressure systems are cold-core polar cyclones and extratropical cyclones which lie on the synoptic scale. Warm-core cyclones such as tropical cyclones, mesocyclones, and polar lows lie within the smaller mesoscale. Subtropical cyclones are of intermediate size.[5][6] Cyclones have also been seen on other planets outside of the Earth, such as Mars and Neptune.[7][8]

Cyclogenesis describes the process of cyclone formation and intensification [9]. Extratropical cyclones form as waves in large regions of enhanced midlatitude 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 polar or subtropical jetstream.

Weather fronts separate two masses of air of different densities and are associated with the most prominent meteorological phenomena. Air masses separated by a front may differ in temperature or humidity. Strong cold fronts typically feature narrow bands of thunderstorms and severe weather, and may on occasion be preceded by squall lines or dry lines. They form west of the circulation center and generally move from west to east. Warm fronts form east of the cyclone center and are usually preceded by stratiform precipitation and fog. They move poleward ahead of the cyclone path. Occluded fronts form late in the cyclone life cycle near the enter of the cyclone and often wrap around the storm center.

Tropical cyclogenesis describes the process of development of tropical cyclones. Tropical cyclones form due to latent heat driven by significant thunderstorm activity, and are warm core.[10] Cyclones can transition between extratropical, subtropical, and tropical phases under the right conditions. Mesocyclones form as warm core cyclones over land, and can lead to tornado formation.[11] Waterspouts can also form from mesocyclones, but more often develop from environments of high instability and low vertical wind shear.[12]

Structure

There are a number of structural characteristics common to all cyclones. As they are low pressure areas, their center is the area of lowest atmospheric pressure in the region, often known in mature tropical cyclones as the eye.[13] Near the center, the pressure gradient force (from the pressure in the center of the cyclone compared to the pressure outside the cyclone) and the Coriolis force must be in an approximate balance, or the cyclone would collapse on itself as a result of the difference in pressure.[14] The wind flow around a large cyclone is counterclockwise in the northern hemisphere and clockwise in the southern hemisphere as a result of the Coriolis effect. (An anticyclone, on the other hand, rotates clockwise in the northern hemisphere, and counterclockwise in the southern hemisphere.)

Formation

The initial extratropical low pressure area forms at the location of the red dot on the image. It is usually perpendicular (at a right angle to) the leaf-like cloud formation seen on satellite during the early stage of cyclogenesis. The location of the axis of the upper level jet stream is in light blue.
Main articles: Cyclogenesis and Tropical cyclogenesis

Cyclogenesis is the development or strengthening of cyclonic circulation in the atmosphere (a low pressure area).[9] Cyclogenesis is an umbrella term for several different processes, all of which result in the development of some sort of cyclone. It can occur at various scales, from the microscale to the synoptic scale. Extratropical cyclones form as waves along weather fronts before occluding later in their life cycle as cold core cyclones. Tropical cyclones form due to latent heat driven by significant thunderstorm activity, and are warm core.[10] Mesocyclones form as warm core cyclones over land, and can lead to tornado formation.[11] Waterspouts can also form from mesocyclones, but more often develop from environments of high instability and low vertical wind shear.[12] Cyclogenesis is the opposite of cyclolysis, and has an anticyclonic (high pressure system) equivalent which deals with the formation of high pressure areas—Anticyclogenesis.[15]

The surface low has a variety of ways of forming. Topography can force a surface low when dense low-level high pressure system ridges in east of a north-south mountain barrier.[16] Mesoscale convective systems can spawn surface lows which are initially warm core.[17] The disturbance can grow into a wave-like formation along the front and the low will be positioned at the crest. Around the low, flow will become cyclonic, by definition. This rotational flow will push polar air equatorward west of the low via its trailing cold front, and warmer air with push poleward low via the warm front. Usually the cold front will move at a quicker pace than the warm front and “catch up” with it due to the slow erosion of higher density airmass located out ahead of the cyclone and the higher density airmass sweeping in behind the cyclone, usually resulting in a narrowing warm sector.[18] At this point an occluded front forms where the warm air mass is pushed upwards into a trough of warm air aloft, which is also known as a trowal.[19]

Tropical cyclones form when the energy released by the condensation of moisture in rising air causes a positive feedback loop over warm ocean waters.[20]

Tropical cyclogenesis is the technical term describing the development and strengthening of a tropical cyclone in the atmosphere.[21] The mechanisms through which tropical cyclogenesis occurs are distinctly different from those through which mid-latitude cyclogenesis occurs. Tropical cyclogenesis involves the development of a warm-core cyclone, due to significant convection in a favorable atmospheric environment. There are six main requirements for tropical cyclogenesis: sufficiently warm sea surface temperatures, atmospheric instability, high humidity in the lower to middle levels of the troposphere, enough Coriolis force to develop a low pressure center, a preexisting low level focus or disturbance, and low vertical wind shear.[22] An average of 86 tropical cyclones of tropical storm intensity form annually worldwide, with 47 reaching hurricane/typhoon strength, and 20 becoming intense tropical cyclones (at least Category 3 intensity on the Saffir-Simpson Hurricane Scale).[23]

Mesocyclones are believed to form when strong changes of wind speed and/or direction with height ("wind shear") sets parts of the lower part of the atmosphere spinning in invisible tube-like rolls. The convective updraft of a thunderstorm is then thought to draw up this spinning air, tilting the rolls' orientation upward (from parallel to the ground to perpendicular) and causing the entire updraft to rotate as a vertical column. Mesocyclones are normally relatively localized: they lie between the synoptic scale (hundreds of kilometers) and microscale (hundreds of meters). Radar imagery is used to identify these features.[24]

Ohhh lala bryson loves tyson <3

Extraterrestrial cyclones

Main article: Extraterrestrial cyclone
Cyclone on Mars, imaged by the Hubble Space Telescope

Cyclones are not unique to Earth. Cyclonic storms are common on Jovian planets, like the Small Dark Spot on Neptune. Also known as the Wizard's Eye, it is about one third the diameter of the Great Dark Spot. It received the name "Wizard's Eye" because it looks like an eye. This appearance is caused by a white cloud in the middle of the Wizard's Eye.[25] Mars has also exhibited cyclonic storms.[7] Jovian storms like the Great Red Spot are usually mistakenly named as giant hurricanes or cyclonic storms. However, this is inaccurate, as the Great Red Spot is, in fact, the inverse phenomenon, an anticyclone.[26]

See also

Template:Tcportal

References

  1. ^ "cyclonic circulation". Glossary of Meteorology . American Meteorological Society. Retrieved 2008-09-17. {{cite web}}: External link in |publisher= and |work= (help)
  2. ^ "cyclone1". Glossary of Meteorology . American Meteorological Society. Retrieved 2008-09-17. {{cite web}}: External link in |publisher= and |work= (help)
  3. ^ "BBC Weather Glossary - Cyclone". BBC Weather. Retrieved 2006-10-24. {{cite web}}: External link in |publisher= (help)
  4. ^ "UCAR Glossary - Cyclone". University Corporation for Atmospheric Research. Retrieved 2006-10-24. {{cite web}}: External link in |publisher= (help)
  5. ^ Robert Hart (2003-02-18). "Cyclone Phase Analysis and Forecast: Help Page". Florida State University Department of Meteorology. Retrieved 2006-10-03. {{cite web}}: Check date values in: |date= (help); External link in |publisher= (help)
  6. ^ Orlanski, I., 1975. A rational subdivision of scales for atmospheric processes. Bulletin of the American Meteorological Society, 56(5), 527-530.
  7. ^ a b David Brand. Colossal cyclone swirling near Martian north pole is observed by Cornell-led team on Hubble telescope. Retrieved on 2008-06-15.
  8. ^ NASA. Historic Hurricanes. Retrieved on 2008-06-14.
  9. ^ a b Arctic Climatology and Meteorology. Cyclogenesis. Retrieved on 2006-12-04.
  10. ^ a b Atlantic Oceanographic and Meteorological Laboratory, Hurricane Research Division. "Frequently Asked Questions: What is an extra-tropical cyclone?". NOAA. Retrieved 2007-03-23.
  11. ^ a b Cite error: The named reference FoN was invoked but never defined (see the help page).
  12. ^ a b National Weather Service Key West summary of waterspout types: http://www.srh.noaa.gov/eyw/HTML/spoutweb.htm
  13. ^ Landsea, Chris and Sim Aberson. (August 13 2004). "What is the "eye"?". Atlantic Oceanographic and Meteorological Laboratory. {{cite news}}: Check date values in: |date= (help)
  14. ^ University of Aberdeen.The Atmosphere in Motion.]
  15. ^ "American Meteorological Society Glossary - Cyclogenesis". Allen Press Inc. 2000-06. Retrieved 2006-10-12. {{cite web}}: Check date values in: |date= (help); External link in |publisher= (help)
  16. ^ COMET Program Flow Interaction With Topography
  17. ^ Raymond D. Menard1, and J.M. Fritsch A Mesoscale Convective Complex-Generated Inertially Stable Warm Core Vortex
  18. ^ The Physics Factbook Density of Air
  19. ^ St. Louis University What is a trowal?
  20. ^ Kerry Emanuel. Anthropogenic Effects on Tropical Cyclone Activity. Retrieved on 2008-02-25.
  21. ^ Arctic Climatology and Meteorology. "Definition for Cyclogenesis". National Snow and Ice Data Center. Retrieved 2006-10-20.
  22. ^ Chris Landsea. Subject: A15) How do tropical cyclones form ? Retrieved on 2008-06-08.
  23. ^ Chris Landsea. "Climate Variability table - Tropical Cyclones". Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration. Retrieved 2006-10-19.
  24. ^ Roger Edwards. The Online Tornado FAQ: Frequently Asked Questions About Tornadoes. Retrieved on 2008-06-14.
  25. ^ NASA. Historic Hurricanes. Retrieved on 2008-06-14.
  26. ^ Ellen Cohen. "Jupiter's Great Red Spot". Hayden Planetarium. Retrieved 2007-11-16. {{cite web}}: External link in |publisher= (help)
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