User:Storm05/List of Tropical Depressions

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Sub-tropical depression Twenty-two in the north Atlantic on October 8.
Sub-tropical depression Twenty-two in the north Atlantic on October 8.

A Tropical Depression is a tropical cyclone that has winds between 25-38 mph[1] and are the weakest of tropical cyclones and the first of three stages of tropical cyclone devlopment.[1]

Contents

[edit] Etymolgy

Main article: Tropical Cyclone

Tropical Depession Ten of the 2004 Atlantic hurricane season showing a typical structure of a tropical depression. The center of circulation is at the left of the cluster of thunderstorms.
Tropical Depession Ten of the 2004 Atlantic hurricane season showing a typical structure of a tropical depression. The center of circulation is at the left of the cluster of thunderstorms.

A tropical depression is an organized system of clouds and thunderstorms with a well defined closed area of circulation with winds less than 39 mph (63 km/h). It is usally ill-defined, lacking the organization and spiral shape of hurricanes and tropical cyclone. These storms are low pressure systems hence the name 'depression'.[2]

Tropical Depressions are numbered when winds reach at least 30 mph (48 km/h). In the Atlantic Basin, the depression number is spelled out (i.e. Tropical Depression One). In the Eastern and Central Pacific, tropical depressions have a suffix E or C, while tropical depressions in the Northwest Pacific have a W suffix.[3]

In the South Pacific Ocean, tropical depressions have a F suffix by the Fiji Meteorlogical Service.[4] and a P suffix by the Joint Typhoon Warning Center.[5] In the Southern Indian Ocean, tropical depressions have an S suffix by the JTWC[6] and a R suffix by La Reunion.[7] In the Northern Indian Ocean, depressions that form there have suffixes ARB and BOB by the India Meteorological Department[8][9]and suffixes A and B by the Joint Typhoon Warning Center.[10]

In addtion, tropical depressions that form in PAGASA's area of responsability are given names form its list of pacific typhoon names.[11]

For subtropical cyclones, the procedure is the same, for example if a subtropical depression forms after the first tropical depression, it will be degsignated as Subtropical Depression Two.[3] Prior to 2002, subtropical depressions had a separate numbering system.[12] The term, 'tropical depression' is used in the Atlantic, Eastern, Central, Western and Southeastern Pacific basins.[3] In the Northern Indian Ocean, the Indian Meteorlogical Department use the term 'depression' in its forecasts.[9] In the Southwestern Indian Ocean, the tropical cyclone center in La Reunion degsignates these storms as a 'tropical disturbance'[13] In Australia, tropical cyclone warning centers use the term 'tropical low' insted of tropical depression in forecast advsiories to prevent confusion between the term deprssion which are associated with extratropical storms.[14]

Many offical and unoffical tropical cyclone warning centers have procedures for tropical depressions crossing from one basin into another. For the National Hurricane Center, if a pacific (or atlantic) crosses into another basin, it will retain its orginial number.[3] Prior to the policy change, if an Atlantic tropical depression crosses into the Eastern Pacific or vice versa, it would be given a new number.[15]

[edit] Records

[edit] Duration

Tropical Depression Seven.
Tropical Depression Seven.
Duration records for Atlantic Basin
Rank Storm Duration (days) Year
1 TD #5[16] 12[16] 1988
2 TD #6[17] 7[17] 1967
2 TD #7[18] 7[18] 1992
4 TD #3[19] 6[19] 1967
5 TD #14[20] 5[20] 1995
5 TD #2[21] 5[21] 1979

[edit] Fatalites and Damage

[edit] Other records

[edit] Named tropical Depressions

[edit] See also

[edit] References

  1. ^ a b University of Illinois (2008). Tropical Depression. Retrieved on 2008-03-17.
  2. ^ U.S. Department of Commerance, National Oceanic and Atmospheric Adminstration and National Weather Service (2001). Hurricanes:Unleashing Natures Fury. Retrieved on 2008-03-17.
  3. ^ a b c d National Weather Service (2005). GENERAL OPERATIONS AND PROCEDURES OF THE NATIONAL WEATHER SERVICE HURRICANE CENTERS Chapter 3. Retrieved on 2008-03-17.
  4. ^ Fiji Meteorlogical Service (2008). Marine Weather Bulletin #1. Web Cite. Retrieved on 2008-03-19.
  5. ^ Joint Typhoon Warning Center (2008). Tropical Cyclone Warning 001. Web Cite. Retrieved on 2008-03-20.
  6. ^ Rob Gutro (2007). Tropical Depression 06S Stirs in the Open Southern Indian Ocean. Retrieved on 2008-03-21.
  7. ^ Ten Spider Enterprises (2008). Tropical Cyclone, Typhoon & Hurricane Tracking. Retrieved on 2008-03-24.
  8. ^ India Meteorological Deprartment (2007). Deep Depression over East Central Arabian Sea; June 2, 2007. WebCite. Retrieved on 2008-03-25.
  9. ^ a b India Meteorlogical Department (2007). Depression over southwest and adjoining southeast Bay of Bengal. WebCite. Retrieved on 2008-03-26.
  10. ^ Joint Typhoon Warning Center (2007). Tropical Cyclone 01B advisory. Retrieved on 2008-03-24.
  11. ^ David Michael V. Padua (2008). THE PHILIPPINE TROPICAL CYCLONE NAMES. Typhoon2000.com. Retrieved on 2008-03-25.
  12. ^ Franklin (2000). Subtropical Depression One Advisory#1. NOAA. Retrieved on 2008-03-27.
  13. ^ Meteo-France (2008). Meteo-France tropical disturbance advisory. Retrieved on 2008-04-04.
  14. ^ Hurricanealley.net (2008). Australian Region tropical cyclones. Retrieved on 2008-04-08.
  15. ^ Dr. Harold P. Gerrah (1988). Hurricane Debby-Tropical Depression 17E Pelimnary Report. National Hurricane Center. Retrieved on 2008-04-11.
  16. ^ a b Alvia A. Lixion and Gilbert B. Clark (1989). Atlantic Tropical Systems of 1988. Retrieved on 2008-04-11.
  17. ^ a b R.H. Simpson, Neil Frank, David Shideler and H.M. Johnson (1968). Atlantic Tropical Systems of 1967. NOAA/American Meteorlogical Society. Retrieved on 2008-04-11.
  18. ^ a b National Hurricane Center (1992). Tropical Depression Seven 1992 Report. NOAA. Retrieved on 2008-04-11.
  19. ^ a b National Hurricane Center (1967). Tropical Depression Three 1967 Report. NOAA. Retrieved on 2008-04-11.
  20. ^ a b Lixion A. Avila (1995). Tropical Depression Fourteen 1995 Report. NOAA. Retrieved on 2008-04-11.
  21. ^ a b Neil L. Frank and Gilbert C. Clark (1980). Atlantic Tropical Systems of 1979. NOAA/American Meteorlogical Society. Retrieved on 2008-04-11.