Hurricane History Map

1977 South-West Indian season

14 storms formed in the South-West Indian basin in 1977, from 2 October 1976 to 3 May 1977.

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Years1977
Ocean basin

Choosing a minimum category hides storms with no wind speed in the record. To see which storms have passed near you, search a town or ZIP code, or tap the map.

Key
  • Tropical depression Winds below 34 knots (39 mph)
  • Tropical storm 34 to 63 knots (39 to 73 mph)
  • Category 1 64 to 82 knots (74 to 95 mph)
  • Category 2 83 to 95 knots (96 to 110 mph)
  • Category 3 96 to 112 knots (111 to 129 mph), major
  • Category 4 113 to 136 knots (130 to 156 mph), major
  • Category 5 137 knots (157 mph) or more, major
  • Unknown intensity No wind speed in the record
  • Post-tropical Storm has become post-tropical (dashed line)

How to read the lines. Each line is the track of one storm, drawn through its six-hourly positions and coloured by its intensity at each point (the Saffir-Simpson scale), so a line changes colour as the storm strengthens or weakens. Tap a line for its details, or tap anywhere else to see which storms have passed nearby. Weaker storms appear as you zoom in. Hurricanes, typhoons and cyclones are the same kind of storm with different names in different oceans.

The 1977 season in numbers

The record holds 14 storms for the 1977 South-West Indian season, of which 14 had names.6 reached tropical storm strength (34 knots or more), 4 reached cyclone strength (category 1 or more) and 0 were major (category 3 or more). 8 have no wind speed in the record.

  • 14storms
  • 6tropical storm strength or more
  • 4cyclone strength or more
  • 0major (category 3 to 5)
  • 41accumulated cyclone energy

Accumulated cyclone energy adds up the squared wind speed of every position of 34 knots or more, divided by 10,000. It is approximate here because the winds are 1-minute equivalents, and it is mostly useful for comparing seasons of one basin.

Strongest storms of 1977

  • Leo (1977)24 March 1977 to 28 March 1977, peak Category 2 (90 kt)
  • Irene (1977)6 January 1977 to 13 January 1977, peak Category 2 (85 kt), 970 hPa
  • Karen (1977)2 March 1977 to 9 March 1977, peak Category 2 (85 kt)
  • Io:jack (1977)13 February 1977 to 2 March 1977, peak Category 1 (80 kt), 975 hPa
  • Harry (1977)15 December 1976 to 21 December 1976, peak Tropical storm (63 kt), 985 hPa

All 14 storms of 1977

StormPeak
Agathe Unknown intensity
Brigitta Unknown intensity
Harry Tropical storm
Clarence Unknown intensity
Irene Category 2
Domitile Unknown intensity
Emilie Unknown intensity
Fifi Unknown intensity
Gilda Unknown intensity
Hervea Unknown intensity
Io:jack Category 1
Karen Category 2
Leo Category 2
Verna Tropical storm

← 1976 · 1978 → · All seasons

Other basins in 1977

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