The 1971 season

Tropical Depression Iphigenie:Tilly (1971)

Tropical Depression Iphigenie:Tilly peaked at unknown kt in the South Indian between February 10, 1971 and February 17, 1971.

Track and intensity

The whole track of Tropical Depression Iphigenie:Tilly, colored by strength, with the other storms of the 1971 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
February 10, 1971 to February 17, 1971
Peak strength
Tropical Depression
Landfall
No; closest approach 1264 km (785 mi)
Accumulated cyclone energy
0.0
Identifier
SH171971

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
Feb 10, 00:0012.0S 90.0ETropical storm
Feb 10, 06:0012.4S 89.3ETropical storm
Feb 10, 12:0012.6S 88.8ETropical storm
Feb 10, 18:0012.9S 88.4ETropical storm
Feb 11, 00:0013.0S 88.0ETropical storm
Feb 11, 06:0013.6S 87.2ETropical storm
Feb 11, 12:0014.4S 86.4ETropical storm
Feb 11, 18:0014.8S 85.6ETropical storm
Feb 12, 00:0015.0S 85.0ETropical storm
Feb 12, 06:0016.0S 84.9ETropical storm
Feb 12, 12:0016.9S 84.3ETropical storm
Feb 12, 18:0017.8S 83.7ETropical storm
Feb 13, 00:0018.6S 83.0ETropical storm
Feb 13, 06:0019.4S 82.2ETropical storm
Feb 13, 12:0020.3S 81.2ETropical storm
Feb 13, 18:0021.2S 80.1ETropical storm
Feb 14, 00:0022.0S 79.0ETropical storm
Feb 14, 06:0022.7S 77.9ETropical storm
Feb 14, 12:0023.4S 76.8ETropical storm
Feb 14, 18:0024.0S 75.7ETropical storm
Feb 15, 00:0024.6S 74.6ETropical storm
Feb 15, 06:0025.2S 73.5ETropical storm
Feb 15, 12:0025.8S 72.5ETropical storm
Feb 15, 18:0026.5S 71.5EMixed
Feb 16, 00:0026.7S 69.0ETropical storm
Feb 16, 06:0027.0S 68.0ETropical storm
Feb 16, 12:0028.2S 67.0ETropical storm
Feb 16, 18:0029.9S 66.4ETropical storm
Feb 17, 00:0031.4S 66.1ETropical storm
Feb 17, 06:0033.0S 66.0ETropical storm

Other South Indian storms of 1971

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.