Portal:Tropical cyclones

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Tropical cyclones Portal

Typhoon tip peak.jpg

A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones feed on heat released when moist air rises, resulting in condensation of water vapor contained in the moist air. They are fueled 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. Tropical cyclones originate in the doldrums near the equator, about 10° away from it.

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

Pictured: Typhoon Tip

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The hurricane seen from the International Space Station.

Hurricane Ivan was the ninth named storm, the sixth hurricane, the fourth major hurricane, and the strongest hurricane of the 2004 Atlantic hurricane season. It formed as a Cape Verde-type hurricane in early September. Ivan reached Category 5 strength on the Saffir-Simpson Hurricane Scale, the highest possible category, becoming the ninth most intense Atlantic hurricane on record and the only Category 5 storm of the season.

Ivan caused catastrophic damage to Grenada, which it struck directly at Category 3 intensity, and heavy damage to Jamaica, Grand Cayman, and the western tip of Cuba. After peaking in strength, it tracked north-northwest across the Gulf of Mexico to make landfall as a strong Category 3 storm in the U.S. near Gulf Shores, Alabama, causing very heavy damage. Ivan dropped heavy rains on the Southeastern United States as it looped across Florida and back into the Gulf of Mexico. The remnant low from the storm regenerated into a new tropical system, which moved into Louisiana and Texas, causing minimal damage. Ivan caused an estimated $13 billion worth of damage in the United States, making it the third costliest hurricane to ever strike the U.S (currently fourth).

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Tropical Storm Allison- Eye.jpg

Tropical Storm Allison over Mississippi as a Subtropical Storm on June 11, 2001. Despite the eye feature, Allison only has winds of 45 mph. The picture is a radar reflectivity image from Mobile, Alabama.



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Active tropical cyclones

North Atlantic (2014)

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East/Central Pacific (2014)

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Northwest Pacific (2014)

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North Indian Ocean (2014)

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South-West Indian Ocean (2013–2014)

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Australian region (2013–2014)

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South Pacific (2013–2014)

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Tropical cyclone anniversaries

Cyclone Orson at peak strength
Subtropical Storm Ana
Typhoon Isa (1997).PNG
  • April 20, 1997 - Typhoon Isa (pictured) reached its peak with winds of 270 km/h (165 mph) to the west of the Mariana Islands. Isa passed to the south of Guam, where it caused beneficial rainfall.
Cyclone Rosita at its peak
Tropical Storm Innocente at its peak
  • April 18, 2000 - Tropical Storm Innocente (pictured) reached its peak strength with winds of 65 km/h (40 mph) in the central Indian Ocean. Innocente did not affect any landmass.

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