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Satellite photograph of Typhoon Tip

A tropical cyclone is a storm system characterized by a large low-pressure center, a closed low-level circulation and a spiral arrangement of numerous thunderstorms that produce strong winds and heavy rainfall. Tropical cyclones feed on the heat released when moist air rises, resulting in condensation of water vapor contained in the moist air. They are fuelled by a different heat mechanism than other cyclonic windstorms such as nor'easters, European windstorms and polar lows, leading to their classification as "warm core" storm systems. Most tropical cyclones originate in the doldrums near the Equator, approximately 10 degrees away.

The term "tropical" refers to both the geographic origin of these systems, which form almost exclusively in tropical regions of the globe, as well as to their formation in maritime tropical air masses. The term "cyclone" refers to such storms' cyclonic nature, with anticlockwise rotation in the Northern Hemisphere and clockwise rotation in the Southern Hemisphere. Depending on its location and intensity, a tropical cyclone may be referred to by names such as "hurricane", "typhoon", "tropical storm", "cyclonic storm", "tropical depression" or simply "cyclone".

Pictured: Typhoon Tip

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Hurricane Georges shortly after Mississippi landfall
Hurricane Georges was the seventh tropical storm, fourth hurricane, and second major hurricane of the 1998 Atlantic hurricane season. The tropical cyclone made seven landfalls on its long track through the Caribbean Sea and Gulf of Mexico during September, becoming the second most destructive storm of the season. Georges killed 603 people, mainly on the island of Hispaniola, and caused nearly $6 billion (1998 US dollars) in damages, mostly in Puerto Rico and Hispaniola. The hurricane affected at least six different countries (Antigua, St. Kitts and Nevis, Haiti, Dominican Republic, Cuba, United States) — more than any other hurricane in years, and more than any other hurricane since until Hurricane Wilma in the 2005 season affected ten different countries.

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Man-Yi 12 july 2007 0505Z.jpg

Typhoon Man-Yi (04W) off the coast of Taiwan, near peak intensity, as seen from the MODIS instrument on NASA's Aqua satellite on July 12, 2007. Man-Yi later weakened and struck Japan, causing three casualties.

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Currently active tropical cyclones

Italicized basins are unofficial.

North Atlantic (2019)
No active systems
East and Central Pacific (2019)
No active systems
West Pacific (2019)
Tropical Depression
North Indian Ocean (2019)
No active systems
Mediterranean (2018–19)
No active systems
South-West Indian Ocean (2018–19)
No active systems
Australian region (2018–19)
No active systems
South Pacific (2018–19)
No active systems
South Atlantic (2018–19)
No active systems

Last updated: 15:24, 18 June 2019 (UTC)

Did you know…

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  • …that according to an unofficial reanalyisis using the Dvorak technique, Cyclone Hina (pictured) had a peak intensity of 170 kt (195 mph, 315 km/h)?
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Tropical cyclone anniversaries

Typhoon Guchol Jun 17 2012 0230Z.jpg

June 17,

  • 1971 - Hurricane Bridget passed just to the south of Acapulco, Mexico bringing gusts of 100 mph (155 km/h) to the city. Many ships, including some naval ships, were sunk killing 40 people and causing $40 million of damage.
  • 2012 - Typhoon Guchol (pictured) attains Category 4 super typhoon intensity with a minimum pressure of 930 hPa with 1-minute sustained winds of 240 km/h (150 mph).
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June 18,

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June 19,

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