Herman: 2023 South-West Indian

Herman reached 128 kt (237 km/h, 147 mph) (C4) in the 2023 South-West Indian season, from 2023-03-27 to 2023-04-04, with track, wind and pressure and 11.7 ACE.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Key Facts

Herman was a category 4 at its peak in the 2023 South-West Indian season.
Peak maximum sustained wind was 128 kt (237 km/h, 147 mph), reached on 31 March 2023, and the lowest pressure was 930 hPa.
The track runs from 27 March 2023 to 4 April 2023 with 61 six hourly positions.
Herman accumulated 11.7 ACE.
No landfall is recorded in the track.

Track

27 March 2023 to 4 April 2023

Herman formed on 27 March 2023 and its track is coloured by category at each six hourly step, peaking as a category 4. Made with Natural Earth and IBTrACS.

Wind

Knots, six hourly

Maximum sustained wind in knots every six hours, from 20 kt (37 km/h, 23 mph) at the start to a peak of 128 kt (237 km/h, 147 mph).

Maximum sustained wind of Herman
Time (UTC)	Wind (kt)
2023-03-27T12:00:00Z	20 kt
2023-03-27T15:00:00Z	20 kt
2023-03-27T18:00:00Z	20 kt
2023-03-27T21:00:00Z	23 kt
2023-03-28T00:00:00Z	20 kt
2023-03-28T03:00:00Z	25 kt
2023-03-28T06:00:00Z	25 kt
2023-03-28T09:00:00Z	25 kt
2023-03-28T12:00:00Z	30 kt
2023-03-28T15:00:00Z	28 kt
2023-03-28T18:00:00Z	30 kt
2023-03-28T21:00:00Z	35 kt
2023-03-29T00:00:00Z	35 kt
2023-03-29T03:00:00Z	40 kt
2023-03-29T06:00:00Z	40 kt
2023-03-29T09:00:00Z	43 kt
2023-03-29T12:00:00Z	50 kt
2023-03-29T15:00:00Z	50 kt
2023-03-29T18:00:00Z	55 kt
2023-03-29T21:00:00Z	53 kt
2023-03-30T00:00:00Z	60 kt
2023-03-30T03:00:00Z	60 kt
2023-03-30T06:00:00Z	75 kt
2023-03-30T09:00:00Z	80 kt
2023-03-30T12:00:00Z	90 kt
2023-03-30T15:00:00Z	100 kt
2023-03-30T18:00:00Z	105 kt
2023-03-30T21:00:00Z	113 kt
2023-03-31T00:00:00Z	115 kt
2023-03-31T03:00:00Z	120 kt
2023-03-31T06:00:00Z	115 kt
2023-03-31T09:00:00Z	128 kt
2023-03-31T12:00:00Z	115 kt
2023-03-31T15:00:00Z	125 kt
2023-03-31T18:00:00Z	110 kt
2023-03-31T21:00:00Z	118 kt
2023-04-01T00:00:00Z	100 kt
2023-04-01T03:00:00Z	105 kt
2023-04-01T06:00:00Z	85 kt
2023-04-01T09:00:00Z	88 kt
2023-04-01T12:00:00Z	75 kt
2023-04-01T15:00:00Z	70 kt
2023-04-01T18:00:00Z	55 kt
2023-04-01T21:00:00Z	50 kt
2023-04-02T00:00:00Z	40 kt
2023-04-02T03:00:00Z	38 kt
2023-04-02T06:00:00Z	35 kt
2023-04-02T09:00:00Z	33 kt
2023-04-02T12:00:00Z	30 kt
2023-04-02T15:00:00Z	28 kt
2023-04-02T18:00:00Z	25 kt
2023-04-02T21:00:00Z	23 kt
2023-04-03T00:00:00Z	25 kt
2023-04-03T03:00:00Z	23 kt
2023-04-03T06:00:00Z	25 kt
2023-04-03T09:00:00Z	23 kt
2023-04-03T12:00:00Z	25 kt
2023-04-03T15:00:00Z	n/a
2023-04-03T18:00:00Z	25 kt
2023-04-03T21:00:00Z	n/a
2023-04-04T00:00:00Z	20 kt

Pressure

hPa, six hourly

Central pressure in hectopascals every six hours, falling to 930 hPa at the lowest.

Central pressure of Herman
Time (UTC)	Pressure (hPa)
2023-03-27T12:00:00Z	1007 hPa
2023-03-27T15:00:00Z	1007 hPa
2023-03-27T18:00:00Z	1007 hPa
2023-03-27T21:00:00Z	1003 hPa
2023-03-28T00:00:00Z	1005 hPa
2023-03-28T03:00:00Z	1002 hPa
2023-03-28T06:00:00Z	1004 hPa
2023-03-28T09:00:00Z	1002 hPa
2023-03-28T12:00:00Z	1002 hPa
2023-03-28T15:00:00Z	1001 hPa
2023-03-28T18:00:00Z	1002 hPa
2023-03-28T21:00:00Z	1001 hPa
2023-03-29T00:00:00Z	999 hPa
2023-03-29T03:00:00Z	1000 hPa
2023-03-29T06:00:00Z	996 hPa
2023-03-29T09:00:00Z	998 hPa
2023-03-29T12:00:00Z	991 hPa
2023-03-29T15:00:00Z	993 hPa
2023-03-29T18:00:00Z	986 hPa
2023-03-29T21:00:00Z	993 hPa
2023-03-30T00:00:00Z	983 hPa
2023-03-30T03:00:00Z	988 hPa
2023-03-30T06:00:00Z	972 hPa
2023-03-30T09:00:00Z	975 hPa
2023-03-30T12:00:00Z	956 hPa
2023-03-30T15:00:00Z	960 hPa
2023-03-30T18:00:00Z	940 hPa
2023-03-30T21:00:00Z	950 hPa
2023-03-31T00:00:00Z	930 hPa
2023-03-31T03:00:00Z	941 hPa
2023-03-31T06:00:00Z	930 hPa
2023-03-31T09:00:00Z	933 hPa
2023-03-31T12:00:00Z	930 hPa
2023-03-31T15:00:00Z	936 hPa
2023-03-31T18:00:00Z	935 hPa
2023-03-31T21:00:00Z	943 hPa
2023-04-01T00:00:00Z	944 hPa
2023-04-01T03:00:00Z	953 hPa
2023-04-01T06:00:00Z	960 hPa
2023-04-01T09:00:00Z	967 hPa
2023-04-01T12:00:00Z	968 hPa
2023-04-01T15:00:00Z	979 hPa
2023-04-01T18:00:00Z	984 hPa
2023-04-01T21:00:00Z	992 hPa
2023-04-02T00:00:00Z	996 hPa
2023-04-02T03:00:00Z	999 hPa
2023-04-02T06:00:00Z	998 hPa
2023-04-02T09:00:00Z	1001 hPa
2023-04-02T12:00:00Z	1002 hPa
2023-04-02T15:00:00Z	1003 hPa
2023-04-02T18:00:00Z	1004 hPa
2023-04-02T21:00:00Z	1004 hPa
2023-04-03T00:00:00Z	1004 hPa
2023-04-03T03:00:00Z	1003 hPa
2023-04-03T06:00:00Z	1005 hPa
2023-04-03T09:00:00Z	1003 hPa
2023-04-03T12:00:00Z	1005 hPa
2023-04-03T15:00:00Z	n/a
2023-04-03T18:00:00Z	1006 hPa
2023-04-03T21:00:00Z	n/a
2023-04-04T00:00:00Z	1007 hPa

ACE Compared With the 2023 Season

Accumulated cyclone energy of named storms in 2023
Freddy (South-West Indian)	66.2 ACE
Dora (Eastern North Pacific)	53.8 ACE
Mawar (Western North Pacific)	36.9 ACE
Lee (North Atlantic)	36.7 ACE
Darian (South-West Indian)	33.1 ACE
Saola (Western North Pacific)	26.8 ACE
Franklin (North Atlantic)	26.4 ACE
Biparjoy (North Indian)	22.5 ACE
Khanun (Western North Pacific)	22.2 ACE
Koinu (Western North Pacific)	20.3 ACE
Bolaven (Western North Pacific)	18.5 ACE
Tammy (North Atlantic)	17.4 ACE
Jova (Eastern North Pacific)	16.1 ACE
Doksuri (Western North Pacific)	15.7 ACE
Lan (Western North Pacific)	15.7 ACE
Norma (Eastern North Pacific)	14.9 ACE
Calvin (Eastern North Pacific)	14.4 ACE
Kevin (South Pacific)	13.6 ACE
Hilary (Eastern North Pacific)	13.2 ACE
Margot (North Atlantic)	12.5 ACE
Lidia (Eastern North Pacific)	12.0 ACE
Herman (this storm)	11.7 ACE
Mocha (North Indian)	11.3 ACE
Judy (South Pacific)	11.3 ACE
Fernanda (Eastern North Pacific)	11.3 ACE
Fabien (South-West Indian)	10.6 ACE
Nigel (North Atlantic)	10.5 ACE
Ilsa (South Pacific)	10.0 ACE
Philippe (North Atlantic)	9.6 ACE
Guchol (Western North Pacific)	9.3 ACE
Haikui (Western North Pacific)	9.2 ACE
Adrian (Eastern North Pacific)	8.8 ACE
Dingani (South-West Indian)	8.1 ACE
Cheneso (South-West Indian)	8.0 ACE
Tej (North Indian)	7.7 ACE
Otis (Eastern North Pacific)	7.4 ACE
Idalia (North Atlantic)	7.1 ACE
Don (North Atlantic)	6.7 ACE
Enala (South-West Indian)	6.6 ACE
Gabrielle (South Pacific)	5.8 ACE
Pilar (Eastern North Pacific)	5.4 ACE
Bret (North Atlantic)	4.5 ACE
Talim (Western North Pacific)	3.7 ACE
Damrey (Western North Pacific)	3.4 ACE
Gert (North Atlantic)	2.7 ACE
Beatriz (Eastern North Pacific)	2.6 ACE
Cindy (North Atlantic)	2.5 ACE
Greg (Eastern North Pacific)	2.4 ACE
Kirogi (Western North Pacific)	2.4 ACE
Michaung (North Indian)	2.3 ACE
Rina (North Atlantic)	2.2 ACE
Eugene (Eastern North Pacific)	1.9 ACE
Jose (North Atlantic)	1.8 ACE
Kenneth (Eastern North Pacific)	1.8 ACE
Yun-Yeung (Western North Pacific)	1.8 ACE
Hamoon (North Indian)	1.7 ACE
Ophelia (North Atlantic)	1.5 ACE
Katia (North Atlantic)	1.3 ACE
Sean (North Atlantic)	1.3 ACE
Sanba (Western North Pacific)	1.3 ACE
Ashley (South-West Indian)	1.3 ACE
Sanvu (Western North Pacific)	1.2 ACE
Max (Eastern North Pacific)	1.2 ACE
Irene (South Pacific)	1.1 ACE
Irwin (Eastern North Pacific)	1.1 ACE
Ramon (Eastern North Pacific)	0.9 ACE
Emily (North Atlantic)	0.9 ACE
Harold (North Atlantic)	0.6 ACE
Arlene (North Atlantic)	0.5 ACE
Midhili (North Indian)	0.5 ACE
Ellie (South-West Indian)	0.4 ACE
Balita (South-West Indian)	0.4 ACE
Hale (South Pacific)	0.4 ACE
Jelawat (Western North Pacific)	0.4 ACE

ACE is the sum of the squares of six hourly wind speeds, in units of 10,000 knots squared, counted while winds are at or above 34 knots.

Which Agency's Numbers

Wind and pressure from bom,jtwc_sh,usa as carried in NOAA IBTrACS. Agencies average winds over different periods.

Related Headlines

Third party news, headline and link only

Download the Data

Sources: Source: International Best Track Archive for Climate Stewardship (IBTrACS) v04r01, NOAA National Centers for Environmental Information, doi:10.25921/82ty-9e16. Some agency values come from third parties such as JMA, IMD and BoM. (NOAA NCEI terms (citation requested)) Made with Natural Earth. Public domain map data. Borders are Natural Earth's de facto depiction. Data as of 2026-10-17. Storm records are best tracks and can be revised by the agencies.