The 1975 season

Unnamed tropical depression (1975)

Unnamed tropical depression peaked at unknown kt in the South Pacific between December 18, 1974 and December 24, 1974.

Track and intensity

The whole track of Unnamed tropical depression, colored by strength, with the other storms of the 1975 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
December 18, 1974 to December 24, 1974
Peak strength
Tropical Depression
Landfall
No; closest approach 318 km (198 mi)
Accumulated cyclone energy
0.0
Identifier
SH061975

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
Dec 18, 12:0015.2S 175.5WTropical storm
Dec 18, 18:0015.9S 174.6WTropical storm
Dec 19, 00:0017.0S 173.7WTropical storm
Dec 19, 06:0018.5S 172.8WTropical storm
Dec 19, 12:0020.0S 171.8WTropical storm
Dec 19, 18:0021.6S 170.9WTropical storm
Dec 20, 00:0023.2S 170.0WTropical storm
Dec 20, 06:0024.6S 169.5WTropical storm
Dec 20, 12:0026.1S 169.4WTropical storm
Dec 20, 18:0027.5S 169.2WTropical storm
Dec 21, 00:0029.0S 169.3WTropical storm
Dec 21, 06:0029.8S 169.6WTropical storm
Dec 21, 12:0030.2S 169.9WTropical storm
Dec 21, 18:0030.8S 170.2WTropical storm
Dec 22, 00:0031.3S 170.5WTropical storm
Dec 22, 06:0031.6S 170.9WTropical storm
Dec 22, 12:0031.7S 171.4WTropical storm
Dec 22, 18:0031.8S 171.8WTropical storm
Dec 23, 00:0031.6S 172.3WTropical storm
Dec 23, 06:0031.0S 171.4WTropical storm
Dec 23, 12:0030.2S 169.3WTropical storm
Dec 23, 18:0029.4S 167.4WTropical storm
Dec 24, 00:0028.5S 165.5WTropical storm
Dec 24, 06:0027.4S 164.1WTropical storm
Dec 24, 12:0026.1S 163.1WMixed

Other South Pacific storms of 1975

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.