List of Atlantic subtropical cyclones

Last updated

Satellite image of Subtropical Storm Andrea in May 2007 east of Florida, shortly after it was designated Andrea 2007-05-09 1615Z.png
Satellite image of Subtropical Storm Andrea in May 2007 east of Florida, shortly after it was designated

A subtropical cyclone is a cyclone with winds equivalent to a tropical storm, but without all the characteristics of a tropical cyclone. Such storms are usually weak, short-lived, form at mid-latitudes, and rarely affect land. [1]

Contents

In the Atlantic Ocean, subtropical storms often form, with an average rate of one per few seasons. [1] Since they started being tracked in the 1960s, there have been 31 of them. [2] Subtropical storms started being named as a part of the regular season in 2002, though they were briefly given names from a different list in the 1970s. [1]

This list does not include any subtropical cyclones that became tropical storms or hurricanes.

Background

A subtropical cyclone is a cyclone with winds equivalent to a tropical storm, but without all the characteristics of a tropical cyclone. It is a type of subtropical cyclone. Such storms are usually weak, short-lived, form at mid-latitudes, and rarely affect land. [1]

In the Atlantic Ocean, subtropical storms often form, with an average rate of one per few seasons. [1] Since they started being tracked in the 1960s, there have been 28 of them. [2] Subtropical storms started being named as a part of the regular season in 2002, though they were briefly given names from a different list in the 1970s. [1]

Systems

NameDurationTypePeak intensityAreas affectedDamage
(USD)		DeathsRefs
Wind speedPressure
Unnamed September 14 – 23, 1968Subtropical hurricane85 mph (140 km/h)976 hPa (28.82 inHg)NoneNoneNone [3]
One September 29 – October 3, 1969Subtropical Storm60 mph (95 km/h)995 hPa (29.38 inHg)FloridaNoneNone [4] [5]
Alpha May 23 – 29, 1972Subtropical Storm70 mph (110 km/h)991 hPa (29.26 inHg)American Southeast2 [6] [7]
Charlie September 19 – 21, 1972Subtropical Storm65 mph (105 km/h)1001 hPa (29.56 inHg)NoneNoneNone [8] [9]
Delta November 1 – 7, 1972Subtropical Storm45 mph (75 km/h)1001 hPa (29.56 inHg)NoneNoneNone [10] [9]
Alfa July 30 – August 2, 1973Subtropical Storm45 mph (75 km/h)1005 hPa (29.68 inHg)New EnglandNoneNone [11] [12]
One June 24 – 25, 1974Subtropical Storm65 mph (100 km/h)1000 hPa (29.53 inHg)Florida$10 million3 [13] [14]
Two July 16 – 19, 1974Subtropical Storm50 mph (85 km/h)1006 hPa (29.71 inHg)NoneNoneNone [15] [16]
Three August 10 – 15, 1974Subtropical Storm60 mph (95 km/h)992 hPa (29.29 inHg)NoneNoneNone [17] [16]
Four October 4 – 8, 1974Subtropical Storm50 mph (85 km/h)1006 hPa (29.71 inHg)The Bahamas, Florida$600,000None [18] [16]
Two December 9 – 13, 1975Subtropical Storm70 mph (110 km/h)985 hPa (29.09 inHg)NoneNoneNone [19] [20]
One May 21 – 25, 1976Subtropical Storm50 mph (85 km/h)994 hPa (29.35 inHg)Florida$628,000None [21] [22]
Three September 13 – 17, 1976Subtropical Storm45 mph (75 km/h)1011 hPa (29.85 inHg)American SoutheastNoneNone [23] [22]
One January 18 – 23, 1978Subtropical Storm45 mph (75 km/h)1002 hPa (29.59 inHg)NoneNoneNone [24] [25]
One October 23 – 25, 1979Subtropical hurricane75 mph (120 km/h)980 hPa (28.94 inHg)NewfoundlandNoneNone [26]
Three November 12 – 17, 1981Subtropical Storm70 mph (110 km/h)978 hPa (28.88 inHg)U.S. East CoastNoneNone [27] [28]
One June 18 – 20, 1982Subtropical Storm70 mph (110 km/h)984 hPa (29.06 inHg)Florida, U.S. East Coast3 [29] [30]
One August 18 – 21, 1984Subtropical Storm60 mph (95 km/h)1000 hPa (29.53 inHg)NoneNoneNone [31] [32]
One April 21 – 24, 1992Subtropical Storm50 mph (85 km/h)1002 hPa (29.59 inHg)NoneNoneNone [33] [34]
Unnamed June 1 – 2, 1997Subtropical Storm50 mph (85 km/h)1003 hPa (29.62 inHg)NoneNoneNone [35]
Unnamed October 25 – 29, 2000Subtropical Storm65 mph (100 km/h)976 hPa (28.82 inHg)New England, Atlantic CanadaNoneNone [36]
Nicole October 10 – 11, 2004Subtropical Storm50 mph (85 km/h)986 hPa (29.12 inHg)Bermuda, Atlantic Canada, New EnglandNoneNone [37]
Unnamed October 4 – 5, 2005Subtropical Storm50 mph (85 km/h)997 hPa (29.44 inHg)AzoresNoneNone [38]
Unnamed October 8 – 10, 2005Subtropical Depression35 mph (55 km/h)1008 hPa (29.77 inHg)NoneNoneNone [39]
Andrea May 9 – 11, 2007Subtropical Storm60 mph (95 km/h)1001 hPa (29.56 inHg)Virginia, Southeastern U.S., BahamasMinimal6 [40]
Unnamed December 5 – 7, 2013Subtropical Storm50 mph (85 km/h)997 hPa (29.44 inHg)AzoresNoneNone [41]
Andrea May 20 – 21, 2019Subtropical Storm40 mph (65 km/h)1006 hPa (29.71 inHg)BermudaNoneNone [42]
Rebekah October 30 – November 1, 2019Subtropical Storm50 mph (85 km/h)983 hPa (29.03 inHg)AzoresNoneNone [43]
Alpha September 17 – 19, 2020Subtropical Storm50 mph (85 km/h)996 hPa (29.41 inHg)Portugal, Spain1 [44]
Teresa September 24 – 25, 2021Subtropical Storm45 mph (75 km/h)1008 hPa (29.77 inHg)BermudaNoneNone [45]
Unnamed January 16 – 17, 2023Subtropical Storm70 mph (110 km/h)976 hPa (28.82 inHg)Nova ScotiaNoneNone [46]
Karen October 10, 2025Subtropical Storm45 mph (75 km/h)998 hPa (29.47 inHg)NoneNoneNone [47]

Statistics

Subtropical storms by month
MonthNumber of storms
January
3
February
0
March
0
April
1
May
6
June
3
July
2
August
2
September
7
October
9
November
2
December
2


References

  1. 1 2 3 4 5 6 Chris Landsea. Subject: A6) What is a sub-tropical cyclone? National Hurricane Center. Retrieved on July 11, 2022.
  2. 1 2 "Atlantic hurricane best track (HURDAT version 2)" (Database). United States National Hurricane Center. May 11, 2024.PD-icon.svg This article incorporates text from this source, which is in the public domain.
  3. ↑ "1968 Subtropical Storm Not Named (1968259N32287)". International Best Track Archive for Climate Stewardship. Retrieved July 11, 2022.
  4. ↑ "1969 Subtropical Storm Not Named (1969273N24275)". International Best Track Archive for Climate Stewardship. Retrieved November 19, 2022.
  5. ↑ David M. Roth (April 8, 2010). Subtropical Storm/T. D. #32 - September 30-October 3, 1969 (Report). Hydrometeorological Prediction Center. Retrieved November 19, 2022.
  6. ↑ "1972 Subtropical Storm Alpha (1972145N31282)". International Best Track Archive for Climate Stewardship. Retrieved November 23, 2022.
  7. ↑ David M. Roth (2009). "Subtropical Storm Alpha – May 23–29, 1972". Hydrometeorological Prediction Center. Retrieved November 23, 2022.
  8. ↑ "1972 Subtropical Storm Charlie (1972264N38301)". International Best Track Archive for Climate Stewardship. Retrieved November 23, 2022.
  9. 1 2 R. H. Simpson; Paul J. Herbert (April 1973). "Atlantic Hurricane Season of 1972" (PDF). United States United States National Hurricane Center. Archived (PDF) from the original on May 25, 2011. Retrieved November 23, 2022.
  10. ↑ "1972 Subtropical Storm Delta (1972307N35313)". International Best Track Archive for Climate Stewardship. Retrieved November 24, 2022.
  11. ↑ "1973 Subtropical Storm Alfa (1973212N33286)". International Best Track Archive for Climate Stewardship. Retrieved November 24, 2022.
  12. ↑ Paul J. Herbert; Neil L. Frank (January 28, 1974). "Atlantic Hurricane Season of 1973" (PDF). United States National Hurricane Center. Archived (PDF) from the original on March 3, 2016. Retrieved November 24, 2022.
  13. ↑ "1974 Subtropical Storm Not Named (1974176N24272)". International Best Track Archive for Climate Stewardship. Retrieved November 25, 2022.
  14. ↑ David M. Roth (2009). "Subtropical Storm 1 - June 24–26, 1974". Hydrometeorological Prediction Center. Retrieved November 25, 2022.
  15. ↑ "1974 Subtropical Storm Not Named (1974197N29285)". International Best Track Archive for Climate Stewardship. Retrieved November 25, 2022.
  16. 1 2 3 John R. Hope (1975). "Atlantic Hurricane Season of 1974". United States National Hurricane Center. 103 (4). American Meteorological Society: 285–293. Bibcode:1975MWRv..103..285H. doi: 10.1175/1520-0493(1975)103<0285:AHSO>2.0.CO;2 . Retrieved November 25, 2022.
  17. ↑ "1974 Subtropical Storm Not Named (1974223N38290)". International Best Track Archive for Climate Stewardship. Retrieved November 25, 2022.
  18. ↑ "1974 Tropical Depression Not Named (1974277N21285)". International Best Track Archive for Climate Stewardship. Retrieved November 25, 2022.
  19. ↑ "1975 Subtropical Storm Not Named (1975344N42317)". International Best Track Archive for Climate Stewardship. Retrieved November 26, 2022.
  20. ↑ Paul J. Hebert (April 1976). Atlantic Hurricane Season of 1975 (PDF). Monthly Weather Review (Report). American Meteorological Society . Retrieved November 25, 2022.
  21. ↑ "1976 Subtropical Storm Not Named (1976143N24271)". International Best Track Archive for Climate Stewardship. Retrieved November 26, 2022.
  22. 1 2 Miles B. Lawrence (1977). "Atlantic Hurricane Season of 1976" (PDF). United States National Hurricane Center. 105. American Meteorological Society: 497–507. Retrieved November 26, 2022.
  23. ↑ "1976 Subtropical Storm Not Named (1976258N28279)". International Best Track Archive for Climate Stewardship. Retrieved November 26, 2022.
  24. ↑ "1978 Subtropical Storm Not Named (1978019N22316)". International Best Track Archive for Climate Stewardship. Retrieved November 27, 2022.
  25. ↑ Miles B. Lawrence (April 1979). Atlantic Hurricane Season of 1978 (PDF) (Report). Miami, Florida. Archived (PDF) from the original on September 23, 2008. Retrieved November 27, 2022.
  26. ↑ "1979 Subtropical Storm Not Named (1979297N29294)". International Best Track Archive for Climate Stewardship. Retrieved July 11, 2022.
  27. ↑ "1981 Subtropical Storm Not Named (1981317N31286)". International Best Track Archive for Climate Stewardship. Retrieved December 10, 2022.
  28. ↑ Miles B. Lawrence (November 30, 1981). Preliminary Report Subtropical Storm (Number Two?): November 12–17, 1981 (Report). United States National Hurricane Center. p. 1. Retrieved December 10, 2022.
  29. ↑ "1982 Subtropical Storm Not Named (1982169N26274)". International Best Track Archive for Climate Stewardship. Retrieved December 10, 2022.
  30. ↑ Joseph Pelissier (1983). Subtropical Storm One Report (Report). United States United States National Hurricane Center. Retrieved December 10, 2022.
  31. ↑ "1984 Subtropical Storm Not Named (1984231N33295)". International Best Track Archive for Climate Stewardship. Retrieved December 11, 2022.
  32. ↑ Robert C. Sheets (October 4, 1984). "Preliminary Report: Subtropical Storm One: August 18–21, 1984". United States United States National Hurricane Center. National Oceanic and Atmospheric Administration . Retrieved December 11, 2022.
  33. ↑ "1992 Subtropical Storm Not Named (1992113N24301)". International Best Track Archive for Climate Stewardship. Retrieved December 28, 2022.
  34. ↑ Miles B. Lawrence (1992). "Preliminary Report – Subtropical Storm One: 21–24 April, 1992" (GIF). United States National Hurricane Center. National Oceanic and Atmospheric Administration. p. 1. Retrieved December 28, 2022.
  35. ↑ Beven, John L; Mayfield, Britt Max (November 12, 1997). Preliminary Report: Unnumbered Subtropical Storm (PDF) (Report). Miami, Florida: United States National Hurricane Center. Retrieved November 24, 2023.
  36. ↑ Beven, John L (November 27, 2000). Tropical Cyclone Report: Subtropical Storm (PDF) (Report). United States National Hurricane Center. Retrieved December 19, 2009.
  37. ↑ Pasch & Roberts (2004). "Subtropical Storm Nicole Tropical Cyclone Report" (PDF). United States National Hurricane Center. Retrieved May 22, 2015.
  38. ↑ Beven, John L; Avila, Lixion A; Blake, Eric S; Brown, Daniel P; Franklin, James L; Knabb, Richard D; Pasch, Richard J; Rhome, Jamie R; Stewart, Stacy R (March 2008). "Annual Summary: Atlantic Hurricane Season of 2005". Monthly Weather Review. 136 (3): 1131–1141. Bibcode:2008MWRv..136.1109B. CiteSeerX   10.1.1.212.8973 . doi:10.1175/2007MWR2074.1.
  39. ↑ Beven, John L (January 17, 2006). Abbreviated Tropical Cyclone Report: Subtropical Depression Twenty-Two (PDF) (Report). United States United States National Hurricane Center. Retrieved January 17, 2024.
  40. ↑ Jamie R. Rhome; Jack Beven; Mark Willis (2007). "Subtropical Storm Andrea Tropical Cyclone Report" (PDF). United States National Hurricane Center. Retrieved 2007-07-02.
  41. ↑ Eric Blake; Todd Kimberlain; John Beven II (February 7, 2014). Tropical Cyclone Report: Unnamed Subtropical Storm (PDF) (Report). Miami, Florida: United States National Hurricane Center. Archived (PDF) from the original on July 12, 2014. Retrieved April 17, 2014.
  42. ↑ Latto, Andrew S (August 6, 2019). Tropical Cyclone Report: Subtropical Storm Andrea (PDF) (Report). United States United States National Hurricane Center. Retrieved January 17, 2024.
  43. ↑ Stewart, Stacy R (December 9, 2019). Tropical Cyclone Report: Subtropical Storm Rebekah (PDF) (Report). United States United States National Hurricane Center. Retrieved January 17, 2024.
  44. ↑ Brown, Daniel P (January 28, 2021). Tropical Cyclone Report: Subtropical Storm Alpha (PDF) (Report). United States United States National Hurricane Center. Retrieved January 17, 2024.
  45. ↑ Beven, John L (January 13, 2022). Tropical Cyclone Report: Subtropical Storm Teresa (PDF) (Report). United States United States National Hurricane Center. Retrieved January 17, 2024.
  46. ↑ Papin, Philippe P; Cangialosi, John P; Beven, John L (July 6, 2023). Tropical Cyclone Report: Unnamed Subtropical Storm (PDF) (Report). United States United States National Hurricane Center. Retrieved January 17, 2024.
  47. ↑ Brown, Michael (2025-10-10). "Post-Tropical Cyclone Karen Discussion Number 4". National Hurricane Center . Miami, Florida . Retrieved 2025-10-10.
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