List of unnamed tropical cyclones

The list of unnamed tropical cyclones since naming began includes all tropical cyclones that met the criteria for naming in a basin, but that for whatever reason, did not receive a name. These systems have occurred in all basins and for various reasons.

Contents 1 Scope, reasons, and naming overview 2 North Atlantic Ocean 2.1 Subtropical cyclones 3 Eastern and central north Pacific Ocean 4 Western north Pacific Ocean 5 North Indian Ocean 6 South-west Indian Ocean 7 Australian region 8 South Pacific 9 References 10 External links

Scope, reasons, and naming overview

In order to ease communications and advisories,^[1] tropical cyclones are named when, according to the appropriate Regional Specialized Meteorological Center or Tropical Cyclone Warning Center, it has reached tropical storm status. A tropical cyclone with winds of tropical storm intensity or higher goes unnamed when operationally, it is not considered to have met the criteria for naming. Reasons for this include:

• Post-operational upgrading. An example of this is the Unnamed tropical storm from the 1996 Pacific hurricane season.^[2]
• Being missed during a season. An example of this is the 2005 Azores Subtropical storm from the 2005 Atlantic hurricane season.^[3]
• Intentionally left unnamed to avoid confusion. An example of this is the 1991 Perfect Storm from the 1991 Atlantic hurricane season.^[4]
• Disagreements between warning centre and naming centres over intensity of a cyclone.

North Atlantic Ocean

Naming has been used since the 1950 season.

• Tropical Storm 12 – 1950
• Tropical Storm 1 – 1952
• Tropical Storm 3 – 1953
• Tropical Storm 7 – 1953
• Tropical Storm 10 – 1953
• Tropical Storm 11 – 1953
• Tropical Storm 13 – 1953
• Tropical Storm 14 – 1953
• Hurricane 8 – 1954
• Tropical Storm 10 – 1954
• Tropical Storm 5 – 1955
• Tropical Storm 11 – 1955
• Tropical Storm 1 – 1956
• Tropical Storm 1 – 1957
• Tropical Storm 8 – 1957
• Hurricane 3 – 1959
• Tropical Storm 1 – 1960
• Tropical Storm 6 – 1961
• Tropical Storm 3 – 1963
• Tropical Storm 1 – 1964
• Tropical Storm 2 – 1964
• Tropical Storm 12 – 1964
• Tropical Storm 1 – 1965
• Hurricane 10 – 1969
• Tropical Storm 11 – 1969
• Tropical Storm 16 – 1969
• Hurricane 17 – 1969
• Tropical Storm 4 – 1970
• Hurricane 9 – 1970
• Hurricane 10 – 1970
• Hurricane 2 – 1971
• Tropical Storm 1 – 1987
• Tropical Storm 7 – 1988
• Hurricane 8 – 1991
• Tropical Storm 2 – 2006
• Tropical Storm 12 – 2011

Subtropical cyclones

Only unnamed subtropical cyclones that could have been named are included. This excludes several that existed, but that were unnamed because subtropical cyclones were not named when they existed.

• Subtropical Storm 19 – 2005

Eastern and central north Pacific Ocean

Naming began in 1960. Before 1957, a few systems in the central Pacific basin were given names, generally in an ad hoc manner.

• Tropical Storm 4 – 1962
• Tropical Storm 8 – 1962
• Tropical Storm 4 – 1963
• Hurricane 12 – 1975
• Tropical Storm 1 – 1996
• Subtropical Storm 18 – 2006†

† Unofficially was a tropical or subtropical cyclone.

Western north Pacific Ocean

Due to differences in wind speed criteria between the Japan Meteorological Agency and the Joint Typhoon Warning Center, a system will sometimes be considered a tropical storm by the JTWC but only a depression by the JMA. This results in several apparent unnamed systems. Because the JMA is responsible for naming, "unnamed tropical cyclones" that met the JTWC's tropical storm criteria but not those of the JMA are excluded.

• Tropical Storm 1 – 1957
• Tropical Storm 8 – 1957
• Tropical Storm 9 – 1957
• Tropical Storm 17 – 1957
• Tropical Storm 33 – 1965
• Tropical Storm 9 – 1986
• Tropical Storm 15 – 1986
• Tropical Storm 6 – 1995
• Tropical Storm 17 – 1996

North Indian Ocean

Due to differences in wind speed criteria between the India Meteorological Department and the Joint Typhoon Warning Center, a system will sometimes be considered a tropical storm by the JTWC but only a depression by the IMD. This results in several apparent unnamed systems. Because the IMD is responsible for naming, "unnamed tropical cyclones" that met the JTWC's tropical storm criteria but not those of the IMD are excluded.

Naming has taken place since mid-2003.

There have been no unnamed tropical cyclones using the India Meteorological Department's criteria. One system, 2007's Yemyin, was upgraded after the fact and retroactively named.^[5]

South-west Indian Ocean

Tropical Cyclones have been named within this basin since 1960, with any tropical depression or Subtropical depression that RSMC La Reunion analyze as having 10-minute sustained windspeeds of at least 65 km/h, 40 mph is named. However unlike other basins RSMC La Reunion do not name tropical depressions, however as they delegate the rights to name tropical cyclones to the Subregional tropical cyclone warning centers in Mauritius or Madagascar depending on whether it is east or west of the 55th meridian east.

• Moderate Tropical Storm F1 – 1998–99
• Subtropical Depression 13 – 1999-00
• Subtropical Depression 15 – 2000–01
• Subtropical Storm 15 – 2006–07
• Tropical Cyclone 01U – 2007–08
• Subtropical Storm 10 – 2009–10
• Subtropical Depression 9 – 2010–11

Australian region

• Cyclone 5 – 1964–65
• Cyclone 6 – 1964–65
• Cyclone 6 – 1965–66
• Cyclone 9 – 1965–66
• Cyclone 2 – 1967–68
• Cyclone 3 – 1967–68
• Cyclone 11 – 1967–68
• Cyclone 13 – 1967–68
• Cyclone 17 – 1967–68
• Cyclone 15 – 1968–69
• Cyclone 16 – 1968–69
• Cyclone 1 – 1969–70
• Cyclone 7 – 1969–70
• Unrecorded Cyclone^[6]
• Cyclone 2 – 1981–82
• Cyclone 6 – 1983–84
• Cyclone 8 – 1995–96
• Cyclone 1 – 2002–03
• Tropical Cyclone 01U – 2007–08

South Pacific

• Unnamed Tropical Cyclone 1971–72 – December 1971
• Unnamed Tropical Cyclone 1971–72 – January 1972
• Unnamed Tropical Cyclone 1973–74 – November 1973
• Unnamed Tropical Cyclone 1976–77 – February 1977 (1)
• Unnamed Tropical Cyclone 1976–77 – February 1977 (2)
• Unnamed Tropical Cyclone 1980–81 – February 1981
• Unnamed Tropical Cyclone 1980–81 – February/March 1981
• Unnamed Tropical Cyclone 1980–81 – March 1981
• Unnamed Tropical Cyclone 1983–84 – February 1984
• Unnamed Tropical Cyclone 1983–84 – March 1984
• Unnamed Tropical Cyclone 1984–85 – December 1985
• Unnamed Tropical Cyclone 1986–87 – March 1987
• Unnamed Tropical Cyclone 1988–89 – February 1989
• Unnamed tropical cyclone 1990–91 – December 1990
• Tropical Cyclone 29P 1996–97 – February 1997

References

Unless otherwise indicated, all storms come from the following datasets from the Regional Specialized Meteorological Center:

• Atlantic: "Atlantic Tracks File 1851–2007". National Hurricane Center. 2008-04-22. Archived from the original on 2008-06-05. http://web.archive.org/web/20080605232927/http://www.nhc.noaa.gov/tracks1851to2007_atl_reanal.txt. Retrieved 2008-06-21. 
• Eastern and central north Pacific: "Eastern North Pacific Tracks File 1949–2007". National Hurricane Center. 2008-03-21. Archived from the original on 2008-04-27. http://web.archive.org/web/20080427145201/http://www.nhc.noaa.gov/tracks1949to2007_epa.txt. Retrieved 2008-06-21. 
• Southwestern Indian Ocean: "Untitled". Meteo France. Archived from the original on 2008-04-21. http://web.archive.org/web/20080421104604/http://www.meteo.fr/temps/domtom/La_Reunion/base_cyclone/base_cyclone.html. Retrieved 2008-06-21. 
• Australian Region: "Untitled" (Zip). Bureau of Meteorology. ftp://ftp.bom.gov.au/anon2/home/ncc/cyclone/cyclones_newformat.zip. Retrieved 2008-06-21. </ref>
• Western north Pacific: "RSMC Best Track Data (Text)". Japan Meteorological Agency. http://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/Besttracks/bst_all.txt. Retrieved 2008-06-21. 
• Northern Indian, western north Pacific, Southern Hemisphere: "JTWC Tropical Cyclone Best Track Data Site". Joint Typhoon Warning Center. 2007-08-09. http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/best_tracks/. Retrieved 2008-05-21. 

External links

• Unisys Weather Data