Cyclone Ilsa (2023)

Cyclone Ilsa reached Category 5 in the South Pacific between April 5, 2023 and April 15, 2023, with a lowest pressure of 920 mb, and made landfall.

Track and intensity

The whole track of Cyclone Ilsa, colored by strength, with the other storms of the 2023 season in the same basin behind it, and its wind and pressure hour by hour. Every fix is in the track table below.

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The storm

Basin: South Pacific
Dates: April 5, 2023 to April 15, 2023
Peak strength: Category 5, 140 kt (161 mph)
Lowest pressure: 920 mb (27.17 inHg)
Landfall: Yes
Accumulated cyclone energy: 13.0
Identifier: SH182023

Deaths and damage

No source this site reads carries a casualty or damage figure for this storm.

Track

Time (UTC)	Position	Wind	Pressure	Status
Apr 5, 12:00	7.1S 135.4E	15 kt	1006 mb	Disturbance
Apr 5, 18:00	7.4S 134.1E	15 kt	1005 mb	Disturbance
Apr 6, 00:00	7.5S 132.9E	15 kt	1004 mb	Disturbance
Apr 6, 06:00	8.1S 132.4E	20 kt	1003 mb	Disturbance
Apr 6, 12:00	8.7S 131.8E	20 kt	1001 mb	Disturbance
Apr 6, 18:00	8.9S 131.3E	30 kt	996 mb	Tropical depression
Apr 7, 00:00	8.9S 130.7E	30 kt	996 mb	Tropical depression
Apr 7, 06:00	9.0S 130.6E	30 kt	995 mb	Tropical depression
Apr 7, 12:00	9.1S 130.5E	35 kt	993 mb	Tropical storm
Apr 7, 18:00	9.4S 130.3E	35 kt	991 mb	Tropical storm
Apr 8, 00:00	9.7S 130.0E	30 kt	993 mb	Tropical depression
Apr 8, 06:00	10.1S 129.7E	30 kt	993 mb	Tropical depression
Apr 8, 12:00	10.7S 129.3E	30 kt	993 mb	Tropical depression
Apr 8, 18:00	11.1S 128.5E	35 kt	991 mb	Tropical storm
Apr 9, 00:00	11.7S 127.3E	45 kt	992 mb	Tropical storm
Apr 9, 06:00	12.2S 126.4E	45 kt	992 mb	Tropical storm
Apr 9, 12:00	12.5S 125.5E	45 kt	992 mb	Tropical storm
Apr 9, 18:00	12.5S 124.8E	45 kt	991 mb	Tropical storm
Apr 10, 00:00	12.5S 124.2E	40 kt	994 mb	Tropical storm
Apr 10, 06:00	12.8S 123.6E	40 kt	994 mb	Tropical storm
Apr 10, 12:00	13.1S 123.2E	40 kt	995 mb	Tropical storm
Apr 10, 18:00	13.5S 122.3E	40 kt	996 mb	Tropical storm
Apr 11, 00:00	13.9S 121.3E	45 kt	994 mb	Tropical storm
Apr 11, 06:00	13.9S 121.3E	55 kt	990 mb	Tropical storm
Apr 11, 12:00	15.1S 120.5E	70 kt	981 mb	Typhoon
Apr 11, 18:00	15.4S 120.2E	70 kt	979 mb	Typhoon
Apr 12, 00:00	15.6S 119.9E	70 kt	980 mb	Typhoon
Apr 12, 06:00	15.8S 119.8E	75 kt	975 mb	Typhoon
Apr 12, 12:00	16.0S 119.7E	85 kt	969 mb	Typhoon
Apr 12, 18:00	17.1S 119.1E	100 kt	957 mb	Typhoon
Apr 13, 00:00	17.8S 118.9E	110 kt	949 mb	Typhoon
Apr 13, 06:00	18.8S 118.7E	125 kt	935 mb	Typhoon
Apr 13, 12:00	19.6S 119.1E	135 kt	924 mb	Super typhoon
Apr 13, 18:00	20.5S 119.9E	100 kt	956 mb	Typhoon
Apr 14, 00:00	21.4S 121.3E	75 kt	975 mb	Typhoon
Apr 14, 06:00	22.0S 123.4E	65 kt	982 mb	Typhoon
Apr 14, 12:00	22.2S 125.4E	45 kt	994 mb	Tropical storm
Apr 14, 18:00	22.7S 128.3E	35 kt	1001 mb	Tropical storm
Apr 15, 00:00	23.0S 130.5E	30 kt	1000 mb	Tropical depression
Apr 15, 06:00	22.9S 132.9E	25 kt	1005 mb	Tropical depression

Other South Pacific storms of 2023

What this means

A best track is the record a warning agency settles on after the storm, not what it said at the time: position, maximum sustained wind and central pressure every six hours, revised against every observation that came in later. Category is the Saffir-Simpson scale, which runs from Category 1 at 64 kt to Category 5 at 137 kt and reads wind only, so it says nothing about surge or rain. Accumulated cyclone energy adds up the square of the wind through the storm's life, so it counts strength and duration together.

Sources

Storm history from NOAA NCEI’s International Best Track Archive for Climate Stewardship (IBTrACS), which merges the official best track of every warning agency. Live storms, cones, watches and warnings from the National Hurricane Center and the Central Pacific Hurricane Center. Archived radar from NOAA’s Level II archive.