The 1921 season

Unnamed tropical depression (1921)

Unnamed tropical depression peaked at unknown kt in the South Pacific between January 20, 1921 and January 30, 1921, with a lowest pressure of 990 mb.

Track and intensity

The whole track of Unnamed tropical depression, colored by strength, with the other storms of the 1921 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
January 20, 1921 to January 30, 1921
Peak strength
Tropical Depression
Lowest pressure
990 mb (29.23 inHg)
Landfall
No; closest approach 142 km (88 mi)
Accumulated cyclone energy
0.0
Identifier
1921020S15150

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
Jan 20, 00:0014.8S 149.8ETropical storm
Jan 20, 06:0014.4S 149.3ETropical storm
Jan 20, 12:0014.0S 148.8ETropical storm
Jan 20, 18:0013.7S 148.4ETropical storm
Jan 21, 00:0013.4S 148.0ETropical storm
Jan 21, 06:0013.2S 147.7ETropical storm
Jan 21, 12:0013.0S 147.4ETropical storm
Jan 21, 18:0012.9S 147.1ETropical storm
Jan 22, 00:0012.7S 146.9ETropical storm
Jan 22, 06:0012.5S 146.6ETropical storm
Jan 22, 12:0012.2S 146.3ETropical storm
Jan 22, 18:0011.9S 146.0ETropical storm
Jan 23, 00:0011.5S 145.8ETropical storm
Jan 23, 06:0011.1S 145.4ETropical storm
Jan 23, 12:0010.6S 145.2ETropical storm
Jan 23, 18:0010.3S 145.1ETropical storm
Jan 24, 00:0010.2S 145.4ETropical storm
Jan 24, 06:0010.4S 146.0ETropical storm
Jan 24, 12:0010.8S 146.6ETropical storm
Jan 24, 18:0011.4S 147.2ETropical storm
Jan 25, 00:0012.1S 147.6ETropical storm
Jan 25, 06:0012.6S 147.7ETropical storm
Jan 25, 12:0013.2S 147.7ETropical storm
Jan 25, 18:0013.8S 147.8ETropical storm
Jan 26, 00:0014.5S 148.2ETropical storm
Jan 26, 06:0015.4S 149.0ETropical storm
Jan 26, 12:0016.3S 150.1ETropical storm
Jan 26, 18:0017.2S 151.2ETropical storm
Jan 27, 00:0017.8S 152.0ETropical storm
Jan 27, 06:0018.1S 152.4ETropical storm
Jan 27, 12:0018.3S 152.5ETropical storm
Jan 27, 18:0018.4S 152.6ETropical storm
Jan 28, 00:0018.6S 152.8ETropical storm
Jan 28, 06:0019.1S 153.2ETropical storm
Jan 28, 12:0019.6S 153.6ETropical storm
Jan 28, 18:0020.2S 154.1ETropical storm
Jan 29, 00:0020.8S 154.6ETropical storm
Jan 29, 06:0021.3S 154.9ETropical storm
Jan 29, 12:0021.7S 155.2ETropical storm
Jan 29, 18:0022.1S 155.6ETropical storm
Jan 30, 00:0022.5S 156.1ETropical storm
Jan 30, 06:0023.0S 156.8ETropical storm
Jan 30, 12:0023.4S 157.9ENot reported
Jan 30, 18:0023.6S 159.0ENot reported

Other South Pacific storms of 1921

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.