Cape Verde hurricane

Cape Verde hurricane tracks

A Cape Verde hurricane or Cabo Verde hurricane is an Atlantic hurricane that originates at low-latitude in the deep tropics from a tropical wave that has passed over or near the Cape Verde islands after exiting the coast of West Africa. The average Atlantic hurricane season has about two Cape Verde hurricanes, which are often the largest and most intense storms of the season due to having plenty of warm open ocean over which to develop before encountering land or other factors prompting weakening. A good portion of Cape Verde storms are large, and some, such as Hurricane Ivan, Hurricane Dorian, Hurricane Laura and Hurricane Irma have set various records. Most of the longest-lived tropical cyclones in the Atlantic basin are Cape Verde hurricanes. While many move harmlessly out to sea, some move across the Caribbean sea and into the Gulf of Mexico, becoming damaging storms for Caribbean nations, Central America, Mexico, Bermuda, the United States, and occasionally even Canada. Research projects since the 1970s have been launched to understand the formation of these storms.

Origin

Prior to the early 1940s, the term Cape Verde hurricane referred to August and early September storms that formed to the east of the surface plotting charts in use at the time.[1] Cape Verde hurricanes typically develop from tropical waves which form in the African savanna during the wet season, then move into the African steppes. The disturbances move off the western coast of Africa and become tropical cyclones soon after moving off the coast,[2] within 10 to 15 degrees latitude, or 1,100 kilometres (680 mi) to 1,600 kilometres (990 mi), of the Cape Verde Islands;[1] this comprises the tropical latitudes east of the 40th meridian west. In the years since the phrase's coining, increasing detection has allowed meteorologists to determine that since the start of the satellite era, Cape Verde hurricanes have formed as early as July 3 (Hurricane Bertha of 2008) and as late as October 10 (Hurricane Joan–Miriam of 1988).

Research

Twenty nations took part in the GATE research project in 1974, where Douglas DC-6 aircraft examined tropical waves which spawned Cape Verde hurricanes.[3] In 2006, there was a two-month research project known as NAMMA-06 (short for NASA African Monsoon Multidisciplinary Activities)[4] which flew Douglas DC-8s into seedling disturbances in the eastern Atlantic which had the potential to become Cape Verde hurricanes.[5][6]

See also

  • Atlantic hurricane season
  • Tropical cyclogenesis

References

  1. ^ a b Gordon E. Dunn; Banner I. Miller (1960). Atlantic Hurricanes. Louisiana State University Press. p. 54. ASIN B0006BM85S.
  2. ^ Chris Landsea (1997-07-18). "FAQ: HURRICANES, TYPHOONS AND TROPICAL CYCLONES (Part 1 of 2) Subject: A2) What are "Cape Verde"-type hurricanes?". Faqs.org. Retrieved 2009-10-08.
  3. ^ National Oceanic and Atmospheric Administration (2007-02-01). "Feature Stories : Fifty Years of NOAA Hurricane Research". Department of Commerce. Retrieved 2010-01-20.
  4. ^ R. K. Kakar (Fall 2006). "NASA's Three Pronged Approach to Hurricane Research". National Oceanic and Atmospheric Administration. Bibcode:2006AGUFM.A21H..01K. Cite journal requires |journal= (help)
  5. ^ Jon Hamilton (2006-10-17). "Off Africa's Coast, a Hurricane Nursery". National Public Radio. Retrieved 2010-01-20.
  6. ^ Marc Kaufman (2006-08-07). "Research Team Seeking Clues to a Hurricane's Birth". The Washington Post. Retrieved 2010-01-20.

External links

Media files used on this page

Cape Verde hurricane track.jpg
Graphic showing the typical track of a en:Cape Verde-type hurricane. The tracks begin south of en:Cape Verde in the eastern en:Atlantic Ocean.

Copyright status

The NOAA emblem is the property of the U.S. Government and a trademark of the en:United States Department of Commerce.

Source

NOAA graphic from http://www.aoml.noaa.gov/hrd/tcfaq/CVtrak.jpg

en:nl:Afbeelding:KaapverdischeOrkanen.jpg
Cyclone Catarina from the ISS on March 26 2004.JPG
Before the year 2004, only two tropical cyclones had ever been noted in the South Atlantic Basin, and no hurricane. However, a circulation center well off the coast of southern Brazil developed tropical cyclone characteristics and continued to intensify as it moved westward. The system developed an eye and apparently reached hurricane strength on Friday, March 26, before eventually making landfall late on Saturday, March 27, 2004.
The crew of the International Space Station was notified of the cyclone and acquired excellent photographs of the storm just as it made landfall on the southern Brazilian state of Santa Catarina (the storm has been unofficially dubbed “Cyclone Catarina”). Note the clockwise circulation of Southern Hemisphere cyclones, the well-defined banding features, and the eyewall of at least a Category 1 system. The coastline is visible under the clouds in the upper left corner of the image.