List of Atlantic subtropical cyclones

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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]

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


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References

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  10. ↑ "1972 Subtropical Storm Delta (1972307N35313)". International Best Track Archive for Climate Stewardship. Retrieved November 24, 2022.
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  17. ↑ "1974 Subtropical Storm Not Named (1974223N38290)". International Best Track Archive for Climate Stewardship. Retrieved November 25, 2022.
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  21. ↑ "1976 Subtropical Storm Not Named (1976143N24271)". International Best Track Archive for Climate Stewardship. Retrieved November 26, 2022.
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  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.
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