Hurricane History Map

2009 South-West Indian season

18 storms formed in the South-West Indian basin in 2009, from 15 October 2008 to 1 May 2009.

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Years2009
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 2009 season in numbers

The record holds 18 storms for the 2009 South-West Indian season, of which 17 had names.18 reached tropical storm strength (34 knots or more), 7 reached cyclone strength (category 1 or more) and 4 were major (category 3 or more).

  • 18storms
  • 18tropical storm strength or more
  • 7cyclone strength or more
  • 4major (category 3 to 5)
  • 82accumulated 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 2009

  • Gael (2009)31 January 2009 to 12 February 2009, peak Category 4 (120 kt), 930 hPa
  • Fanele (2009)17 January 2009 to 26 January 2009, peak Category 4 (115 kt), 930 hPa
  • Billy (2009)16 December 2008 to 4 January 2009, peak Category 3 (110 kt), 950 hPa
  • Ilsa (2009)15 March 2009 to 26 March 2009, peak Category 3 (100 kt), 958 hPa
  • Hina (2009)20 February 2009 to 2 March 2009, peak Category 1 (65 kt), 976 hPa

All 18 storms of 2009

StormPeak
Asma Tropical storm
Bernard Tropical storm
Anika Tropical storm
Cinda Tropical storm
Billy Category 3
Dongo Tropical storm
Eric Tropical storm
Fanele Category 4
Dominic Tropical storm
Gael Category 4
Freddy Tropical storm
Hina Category 1
Gabrielle Tropical storm
Unnamed storm Tropical storm
Ilsa Category 3
Izilda Category 1
Jade Category 1
Kirrily Tropical storm

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Other basins in 2009

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