The 1981 season

Tropical Depression Diana (1981)

Tropical Depression Diana peaked at unknown kt in the South Indian between December 17, 1980 and December 19, 1980.

Track and intensity

The whole track of Tropical Depression Diana, colored by strength, with the other storms of the 1981 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 Indian
Dates
December 17, 1980 to December 19, 1980
Peak strength
Tropical Depression
Landfall
No; closest approach 560 km (348 mi)
Accumulated cyclone energy
0.0
Identifier
SH051981

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 17, 00:0013.0S 59.0ETropical storm
Dec 17, 06:0013.3S 59.1ETropical storm
Dec 17, 12:0013.6S 58.8ETropical storm
Dec 17, 18:0014.1S 58.2ETropical storm
Dec 18, 00:0014.5S 57.5ETropical storm
Dec 18, 06:0014.3S 56.9ETropical storm
Dec 18, 12:0014.0S 56.5ETropical storm
Dec 18, 18:0013.9S 56.3ETropical storm
Dec 19, 00:0013.8S 56.0ETropical storm
Dec 19, 06:0013.8S 55.8ETropical storm
Dec 19, 12:0013.8S 55.5ETropical storm

Other South Indian storms of 1981

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.