Portal:Tropical cyclones
Tropical cyclones portal
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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The season officially began on June 1, 2005, and lasted until November 30, 2005, although effectively the season persisted into January 2006 due to continued storm activity. A record twenty-eight tropical and subtropical storms formed, of which a record fifteen became hurricanes. Of these, seven strengthened into major hurricanes, a record-tying five became Category 4 hurricanes and a record four reached Category 5 strength, the highest categorization for hurricanes on the Saffir–Simpson hurricane scale. Among these Category 5 storms was Hurricane Wilma, the most intense hurricane ever observed in the Atlantic.
Recently featured: Hurricane Katrina – List of storms in the 2005 Atlantic hurricane season – List of New Jersey hurricanes – Hurricane Claudette (2003) – Browse
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Remnants of Hurricane Agnes over the Northeastern United States. Agnes dropped torrential and record-breaking rainfall, causing over $2 billion in damage (1972 USD) and more than 100 deaths. The name was later retired.
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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)
- No active systems
- North Indian Ocean (2019)
- No active systems
- Mediterranean (2018–19)
- No active systems
- South Pacific (2018–19)
- No active systems
- South Atlantic (2018–19)
- No active systems
Last updated 12:29, 24 April 2019 (UTC)
Did you know…
- …that 2018 was the first year ever recorded to feature Category 5 hurricanes on both Atlantic and Pacific oceans?
- …that the 2018 Pacific hurricane season was the first season ever recorded to feature Category 5 hurricanes on both eastern and central Pacific areas of responsibility?
- …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)?
- …that Cyclone Onil (pictured) was the first tropical cyclone named by the India Meteorological Department?
Tropical cyclone anniversaries
April 23,
- 2006 - Cyclone Monica (pictured) reached its peak intensity just off the Northern Australian coast with a central pressure of 916 hPa (mbar).
- 2010 - Over in the Western Region of Australian, Cyclone Sean attains peak intensity as a Category 2 tropical cyclone, without affecting land.
April 24,
- 1987 - Cyclone Elizabeta reached peak intensity with 1-minute sustained winds of 140 km/h (90 mph), while it was south of Madagascar.
- 2001 - Cyclone Alistair (pictured) made landfall near Carnarvon, Western Australia. The highest reported wind gust was 90 km/h (55 mph).
April 25,
- 1986 - As a small cyclone, Cyclone Manu (pictured) attained peak intensity as a weak Category 1 tropical cyclone, before nearing the shores of Queensland.
- 2005 - Typhoon Sonca reached its peak intensty with a central pressure of 928 hPa (mbar) to the east of the Philippines.
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