Unnamed tropical depression (1958)

Unnamed tropical depression peaked at unknown kt in the Western Pacific between December 9, 1958 and December 12, 1958, with a lowest pressure of 985 mb.

Track and intensity

The whole track of Unnamed tropical depression, colored by strength, with the other storms of the 1958 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: Western Pacific
Dates: December 9, 1958 to December 12, 1958
Peak strength: Tropical Depression
Lowest pressure: 985 mb (29.09 inHg)
Landfall: No; closest approach 1181 km (734 mi)
Accumulated cyclone energy: 0.0
Identifier: 1958344N12141

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)	Position	Pressure	Status
Dec 9, 18:00	12.0N 140.5E	1006 mb	Mixed
Dec 10, 00:00	13.5N 140.5E	1006 mb	Mixed
Dec 10, 06:00	15.0N 140.7E	1002 mb	Mixed
Dec 10, 12:00	16.3N 141.0E	1000 mb	Tropical storm
Dec 10, 18:00	18.0N 141.3E	995 mb	Tropical storm
Dec 11, 00:00	19.4N 141.9E	990 mb	Tropical storm
Dec 11, 06:00	20.2N 142.8E	985 mb	Tropical storm
Dec 11, 12:00	21.1N 143.6E	985 mb	Tropical storm
Dec 11, 18:00	22.3N 144.6E	990 mb	Tropical storm
Dec 12, 00:00	23.2N 145.7E	998 mb	Tropical storm
Dec 12, 06:00	24.6N 146.8E	1000 mb	Tropical storm
Dec 12, 12:00	26.5N 148.6E	1004 mb	Tropical storm
Dec 12, 18:00	30.0N 151.6E	1004 mb	Mixed

Other Western Pacific storms of 1958

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.