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User:Meow/List of typhoon-equivalent extratropical cyclones

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Systems

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See also: /2000s and /2010s

2020–21

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It was a very active season, including a 924 hPa cyclone. The last system of this system is former Typhoon Surigae, with the lowest central pressure of former tropical cyclones among the whole lists of this page.

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    14 December
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    29 December
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    1 January
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    20 January
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    27 January
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    5 February
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    16 February
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    1 March
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    27 April
TY-equivalent period Sustained
windspeeds 		Pressure Land areas affected Deaths Refs
2020-12-04T18Z 120 km/h (75 mph) 966 hPa (28.53 inHg) None None
2020-12-13T18Z 120 km/h (75 mph) 962 hPa (28.41 inHg) Russian Far East, Aleutian Islands None
2020-12-29T18Z 130 km/h (80 mph) 972 hPa (28.70 inHg) None None
2020-12-31T06Z –
2020-12-31T18Z		 120 km/h (75 mph) 924 hPa (27.29 inHg) Japan, Russian Far East, Aleutian Islands None
2021-01-20T06Z –
2021-01-20T18Z		 120 km/h (75 mph) 968 hPa (28.59 inHg) Japan, Aleutian Islands None
2021-01-26T06Z –
2021-01-26T18Z		 120 km/h (75 mph) 940 hPa (27.76 inHg) Japan, Aleutian Islands, Russian Far East None
2021-02-05T00Z 120 km/h (75 mph) 976 hPa (28.82 inHg) Japan None
2021-02-15T18Z 130 km/h (80 mph) 946 hPa (27.94 inHg) Japan, Russian Far East None
2021-02-28T18Z –
2021-03-01T00Z		 120 km/h (75 mph) 946 hPa (27.94 inHg) Japan, Russian Far East, Aleutian Islands None
2021-04-26T18Z[nb 1] 130 km/h (80 mph) 944 hPa (27.88 inHg) Russian Far East None
Aggregates
10 systems 130 km/h (80 mph) 924 hPa (27.29 inHg)   0

2021–22

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It was an average period with the strongest June system since 2012.

  •  
    15 February
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    30 April
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    12 June
TY-equivalent period Sustained
windspeeds 		Pressure Land areas affected Deaths Refs
2021-10-29T12Z[nb 2] 120 km/h (75 mph) 974 hPa (28.76 inHg) None None
2021-12-13T06Z 120 km/h (75 mph) 962 hPa (28.41 inHg) Russian Far East None
2022-02-15T12Z –
2022-02-15T18Z		 120 km/h (75 mph) 960 hPa (28.35 inHg) Japan, Aleutian Islands None
2022-04-30T00Z –
2022-04-30T12Z		 130 km/h (80 mph) 962 hPa (28.41 inHg) East China, Japan, Aleutian Islands None
2022-06-12T18Z 120 km/h (75 mph) 972 hPa (28.70 inHg) East China, Japan None
Aggregates
5 systems 130 km/h (80 mph) 960 hPa (28.35 inHg)   0

2022–23

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  •  
    15 September
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    29 September
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    28 November
  •  
    25 January
TY-equivalent period Sustained
windspeeds 		Pressure Land areas affected Deaths Refs
2022-09-15T06Z –
2022-09-16T12Z[nb 3]		 130 km/h (80 mph) 940 hPa (27.76 inHg) Aleutian Islands None
2022-09-29T06Z –
2022-09-30T12Z[nb 4]		 120 km/h (75 mph) 940 hPa (27.76 inHg) Aleutian Islands None
2022-11-28T12Z –
2022-11-29T12Z		 130 km/h (80 mph) 960 hPa (28.35 inHg) Ryukyu Islands None
2023-01-25T00Z –
2023-01-25T06Z		 120 km/h (75 mph) 938 hPa (27.70 inHg) Japan, Kuril Islands, Kamchatka Peninsula None
2023-01-28T18Z –
2023-01-29T00Z		 120 km/h (75 mph) 950 hPa (28.05 inHg) Japan, Russian Far East None
Aggregates
5 systems 130 km/h (80 mph) 938 hPa (27.70 inHg)   0

2023–24

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  •  
    14 October
TY-equivalent period Sustained
windspeeds 		Pressure Land areas affected Deaths Refs
2023-10-14T12Z –
2023-10-15T06Z[nb 5]		 130 km/h (80 mph) 950 hPa (28.05 inHg) Aleutian Islands None
Aggregates
1 system 130 km/h (80 mph) 950 hPa (28.05 inHg)   0

2024–25

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  •  
    31 October
TY-equivalent period Sustained
windspeeds 		Pressure Land areas affected Deaths Refs
2024-10-31T18Z 120 km/h (75 mph) 968 hPa (28.59 inHg) Japan None
Aggregates
1 system 120 km/h (75 mph) 968 hPa (28.59 inHg)   0

Statistics

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From September 2001 to August 2024, the Japan Meteorological Agency reported 115 extratropical cyclones with typhoon-equivalent (10-minute) maximum sustained winds in the Northwest Pacific Ocean. There was an average of 5 systems reaching that intensity each period.

Winds

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About three fourths of typhoon-equivalent extratropical cyclones were at 65 knots. Approximately one 70-knot system formed each period. Systems at or over 75 knots were extremely rare.

Maximum winds
Knots Systems
65 85
70 25
75 4
80 1

Pressure

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Unlike tropical cyclones, the central pressure of typhoon-equivalent extratropical cyclones at the same or similar intensity could vary significantly, although more than a half of total systems were between 950 to 970 hPa. The highest one was 988 hPa recorded in December 2012, while the lowest one was 920 hPa recorded in November 2014.

Minimal pressure
hPa Systems
920–929 2
930–939 9
940–949 19
950–959 29
960–969 35
970–979 19
980–989 2

Months

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More than a half of total systems formed between December and February. Lots of September and October systems were originally tropical. No typhoon-equivalent systems were recorded in May, July and August.

Formation time
Month Systems
September 5
October 12
November 9
December 25
January 22
February 22
March 12
April 6
May 0
June 2
July 0
August 0

Notes

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  1. ^ Transitioned from Typhoon Surigae in 2021.
  2. ^ Transitioned from Typhoon Malou in 2021.
  3. ^ Transitioned from Typhoon Merbok in 2022.
  4. ^ Transitioned from Severe Tropical Storm Kulap in 2022.
  5. ^ Transitioned from Typhoon Bolaven in 2023.

References

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