The 1984 season

Hurricane Iselle (1984)

Hurricane Iselle reached Category 4 in the Eastern Pacific between August 3, 1984 and August 12, 1984.

Track and intensity

The whole track of Hurricane Iselle, colored by strength, with the other storms of the 1984 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
Eastern Pacific
Dates
August 3, 1984 to August 12, 1984
Peak strength
Category 4, 115 kt (132 mph)
Landfall
No; closest approach 169 km (105 mi)
Accumulated cyclone energy
16.3
Fastest the center moved
13 kt (15 mph)
Identifier
EP091984

Deaths and damage

No source this site reads publishes a machine-readable casualty or damage figure for a storm of this era. The National Hurricane Center’s season tables begin in 1995 and carry deaths and damage only from 2005 in the Atlantic and 2020 in both basins; the US Storm Events record begins in 1996.

Track

Time (UTC)PositionWindPressureStatus
Aug 3, 18:0014.0N 96.4W30 ktTropical depression
Aug 4, 00:0014.1N 97.2W30 ktTropical depression
Aug 4, 06:0014.2N 97.9W30 ktTropical depression
Aug 4, 12:0014.3N 98.7W30 ktTropical depression
Aug 4, 18:0014.4N 99.3W40 ktTropical storm
Aug 5, 00:0014.6N 100.0W40 ktTropical storm
Aug 5, 06:0014.8N 100.7W40 ktTropical storm
Aug 5, 12:0015.0N 101.5W50 ktTropical storm
Aug 5, 18:0015.4N 102.5W55 ktTropical storm
Aug 6, 00:0016.0N 103.5W60 ktTropical storm
Aug 6, 06:0016.6N 104.5W65 ktHurricane
Aug 6, 12:0016.8N 105.6W65 ktHurricane
Aug 6, 18:0017.0N 106.9W75 ktHurricane
Aug 7, 00:0017.2N 108.1W75 ktHurricane
Aug 7, 06:0017.4N 109.3W75 ktHurricane
Aug 7, 12:0017.7N 110.6W75 ktHurricane
Aug 7, 18:0017.9N 112.0W75 ktHurricane
Aug 8, 00:0018.0N 113.1W80 ktHurricane
Aug 8, 06:0018.1N 114.0W85 ktHurricane
Aug 8, 12:0018.2N 114.8W100 ktHurricane
Aug 8, 18:0018.3N 115.5W115 ktHurricane
Aug 9, 00:0018.5N 116.3W115 ktHurricane
Aug 9, 06:0018.8N 117.0W110 ktHurricane
Aug 9, 12:0019.1N 117.7W95 ktHurricane
Aug 9, 18:0019.5N 118.2W85 ktHurricane
Aug 10, 00:0020.0N 118.7W75 ktHurricane
Aug 10, 06:0020.5N 119.2W75 ktHurricane
Aug 10, 12:0021.3N 119.8W70 ktHurricane
Aug 10, 18:0022.1N 120.4W70 ktHurricane
Aug 11, 00:0022.9N 121.0W65 ktHurricane
Aug 11, 06:0023.7N 121.7W55 ktTropical storm
Aug 11, 12:0024.3N 122.3W50 ktTropical storm
Aug 11, 18:0024.9N 122.9W40 ktTropical storm
Aug 12, 00:0025.4N 123.5W35 ktTropical storm
Aug 12, 06:0025.8N 124.0W30 ktTropical depression
Aug 12, 12:0026.4N 124.2W30 ktTropical depression

Other Eastern Pacific storms of 1984

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.

The National Hurricane Center has published no tropical cyclone report for this storm.