The 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 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. Most tropical cyclones originate in the doldrums, approximately ten degrees from the Equator.
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".
Types of cyclone: 1. A "Typhoon" is a tropical cyclone located in the North-west Pacific Ocean which has the most cyclonic activity and storms occur year-round. 2. A "Hurricane" is also a tropical cyclone located at the North Atlantic Ocean or North-east Pacific Ocean which have an average storm activity and storms typically form between May 15 and November 30. 3. A "Cyclone" is a tropical cyclone that occurs in the South Pacific and Indian Oceans.
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In September 2004, Hurricane Ivan caused significant effects in the Lesser Antilles and South America, including 44 deaths and over $1 billion in damage (2004 USD), primarily in Grenada where it was considered the worst hurricane in nearly 50 years. Hurricane Ivan developed from a tropical wave on September 2 and rapidly intensified to become a major hurricane, passing through the southern Lesser Antilles on September 7 with winds of 125 mph (201 km/h). At the time, its typical storm force winds extended outward up to 160 miles (260 km) with hurricane-force winds outward to 70 miles (110 km), and the northern portion of the eye passed over Grenada.
In the region, the worst damage occurred on Grenada, where the damage total of $1.1 billion (2004 USD, ($1.77 billion 2024 USD)) represented 200% of its GDP. The hurricane damaged more than 14,000 homes and destroyed 30% of the houses, leaving about 18,000 people homeless. A total of 39 people were killed by the hurricane on the island. Elsewhere, Hurricane Ivan caused at least three fatalities and moderate damage in northern Venezuela. One person died each in Trinidad and Barbados. The name Ivan was later retired. (Full article...)Selected image -
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The 2007 Pacific hurricane season was a well below-average Pacific hurricane season, featuring only one major hurricane. The season officially started on May 15 in the eastern Pacific and on June 1 in the central Pacific, and ended on November 30; these dates conventionally delimit the period during which most tropical cyclones form in the region. The first tropical cyclone of the season, Alvin, developed on May 27, while the final system of the year, Kiko, dissipated on October 23. Due to unusually strong wind shear, activity fell short of the long-term average, with a total of 11 named storms, 4 hurricanes, and 1 major hurricane. At the time, 2007 featured the second-lowest value of the Accumulated cyclone energy (ACE) index since reliable records began in 1971. Two tropical cyclones – Cosme and Flossie – crossed into the central Pacific basin during the year, activity below the average of 4 to 5 systems.
Impact during the season was relatively minimal. In early June, Tropical Storm Barbara moved ashore just northwest of the Mexico–Guatemala border, causing $55 million (2007 USD) in damage and 4 deaths. In late July, Cosme passed south of the island of Hawaii as a weakening tropical depression; light rain and increased surf resulted. A few days later, Dalila passed offshore the coastline of southwestern Mexico, killing 11 and causing minimal damage. Hurricane Flossie followed a similar track to Cosme in mid-August, producing gusty winds and light precipitation in Hawaii. Hurricane Henriette in early September produced torrential rainfall in southwestern Mexico, killing 6 and causing $25 million in damage. Baja California received moderate rains from Hurricane Ivo in mid-September, though no damage nor fatalities were reported. In mid-October, Tropical Storm Kiko passed just offshore the coastline of southwestern Mexico. Though no deaths were reported on the Mexico mainland, the storm capsized a ship with 30 people on board, 15 of whom were recovered dead, and 9 of whom were reported missing. Overall, the season ended with $80 million in damage and 49 deaths. (Full article...)Related portals
Currently active tropical cyclones
Italicized basins are unofficial.
- North Atlantic (2024)
- No active systems
- North Indian Ocean (2024)
- No active systems
- Mediterranean (2024–25)
- No active systems
- South-West Indian Ocean (2024–25)
- No active systems
- Australian region (2024–25)
- No active systems
- South Pacific (2024–25)
- No active systems
- South Atlantic (2024–25)
- No active systems
Last updated: 20:54, 24 July 2024 (UTC)
Tropical cyclone anniversaries
July 24,
- 1979 - Tropical Storm Claudette (pictured) made landfall near the Texas-Louisianan border, bringing record levels of rainfall. The resulting floods caused about $400 million of damage.
- 2005 - Tropical Storm Gert becomes the fourth of seven tropical cyclones to make landfall over in Mexico. As a weak tropical storm, Gert only killed one person and caused minimal damages.
July 25
- 1927 - A typhoon moved ashore near Hong Kong and killed about 10,000 people from floods.
- 1985 - Hurricane Bob (pictured) impacted South Carolina as a Category 1 hurricane. Bob caused about $20 million in damage.
- 2002 - Hurricane Elida became the first of three Category 5 major hurricanes of the season. Elida had maximum sustained winds of 260 km/h (160 mph) and a minimum pressure of 921 hPa (27.20 inHg) out in the East Pacific.
- July 26, 1926 - The 1926 Nassau hurricane (track pictured) reached its peak intensity with winds of 220 km/h (140 mph) over the central Bahamas. The hurricane killed 287 people and devastated Nassau.
Did you know…
- …that the Joint Typhoon Warning Center considers that Typhoon Vera (pictured) of 1986 is actually two distinct systems, formed from two separated low-level circulations?
- …that Hurricane Agatha (pictured) was the strongest Pacific hurricane to make landfall in Mexico in May since records began in 1949?
- …that Cyclone Raquel (track pictured) travelled between the Australian and South Pacific basins between the 2014–15 and 2015–16 seasons, spanning both seasons in both basins?
- …that Cyclone Amphan (pictured) in 2020 was the first storm to be classified as a Super Cyclonic Storm in the Bay of Bengal since 1999?
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Accompanying Hurricane Katrina's catastrophic coastal impacts was a moderate tornado outbreak spawned by the cyclone's outer bands. The event spanned August 26–31, 2005, with 57 tornadoes touching down across 8 states. One person died and numerous communities suffered damage of varying degrees from central Mississippi to Pennsylvania, with Georgia sustaining record monetary damage for the month of August. Due to extreme devastation in coastal areas of Louisiana and Mississippi, multiple tornadoes may have been overlooked—overshadowed by the effects of storm surge and large-scale wind—and thus the full extent of the hurricane's tornado outbreak is uncertain. Furthermore, an indeterminate number of waterspouts likely formed throughout the life cycle of Hurricane Katrina.
The outbreak began with an isolated F2 over the Florida Keys on August 26; no tornadoes were recorded the following day as the storm traversed the Gulf of Mexico. Four weak tornadoes were observed on August 28 as the hurricane approached land, each causing little damage. Coincident with Katrina's landfall, activity began in earnest on August 29 with numerous tornadoes touching down across Gulf Coast states. Georgia suffered the greatest impact on this day, with multiple F1 and F2 tornadoes causing significant damage; one person died in Carroll County, marking the first known instance of a tornado-related death in the state during August. A record 18 tornadoes touched down across Georgia on August 29, far exceeding the previous daily record of just 2 tornadoes for the month throughout the state. Activity diminished over the subsequent two days as the former hurricane moved northward. Several more tornadoes touched down across the Mid-Atlantic states before the cessation of the outbreak just after midnight local time on August 31. (Full article...)Topics
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Related WikiProjects
WikiProject Tropical cyclones is the central point of coordination for Wikipedia's coverage of tropical cyclones. Feel free to help!
WikiProject Weather is the main center point of coordination for Wikipedia's coverage of meteorology in general, and the parent project of WikiProject Tropical cyclones. Three other branches of WikiProject Weather in particular share significant overlaps with WikiProject Tropical cyclones:
- The Non-tropical storms task force coordinates most of Wikipedia's coverage on extratropical cyclones, which tropical cyclones often transition into near the end of their lifespan.
- The Floods task force takes on the scope of flooding events all over the world, with rainfall from tropical cyclones a significant factor in many of them.
- WikiProject Severe weather documents the effects of extreme weather such as tornadoes, which landfalling tropical cyclones can produce.
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