2005 South Indian Ocean Tropical Cyclones

Tropical Cyclone Cyclogenesis Date Cyclolysis Date Saffir-Simpson Category Maximum 6-hr Sustained Wind (kt) Maximum 6-hr Wind Gust (kt) Estimated Accumulated Cyclone Energy (ACE*) Index (kt2) Landfall Information (date, location and sustained winds)
Sally 1/8/05 1/10/05 TS 40 50 1.0062 x 104
11S 1/18/05 1/19/05 TS 45 N/A 0.9481 x 104
Daren 1/18/05 1/20/05 TS 45 55 1.2681 x 104
Ernest 1/20/05 1/23/05 Cat 3 100 125 9.7206 x 104 1/23/05 - Madagascar (54 kt)
Tim 1/23/05 1/25/05 TS 35 45 0.6125 x 104
14S 2/3/05 2/3/05 TS 35 N/A 0.2025 x 104
Gerard 2/3/05 2/5/05 TS 60 75 1.3162 x 104
Hennie 3/21/05 3/27/05 Cat 1 65 80 4.5244 x 104 3/24/05 - Mauritius (65 kt)
Isang 4/3/05 4/6/05 TS 55 70 2.3044 x 104
Adeline-Juliet 4/4/05 4/12/05 Cat 4 130 160 28.9244 x 104
01S 10/14/05 10/15/05 TS 35 45 0.6125 x 104
02S 11/5/05 11/8/05 TS 45 55 1.33375 x 104
Bertie-Alvin 11/19/05 11/26/05 Cat 4 115 140 15.80375 x 104
04S 12/24/05 12/25/05 TS 35 45 0.6125 x 104

Preliminary 2005 South Indian Ocean ACE Index = 69.19 x 104 kt2

*The Accumulated Cyclone Energy (ACE) Index is calculated by summing the squares of the estimated 6-hourly maximum sustained wind speed in knots (Vmax2) for all periods in which the tropical cyclone is a tropical storm or greater intensity. For a complete description of the ACE Index see Bell et al. (2000), Bulletin of the American Meteorological Society (81) S1-S50.


The Saffir-Simpson Scale for Tropical Cyclones

Category Miles Per Hour (mph) Knots (kt) Kilometers Per Hour (km hr-1)
Tropical Storm (TS)
 39-73 34-63 63-118
Cat 1
 74-95 64-82 119-153
Cat 2
 96-110 83-95 154-177
Cat 3
 111-130 96-113 178-209
Cat 4
 131-155 114-135 210-249
Cat 5
 156 or greater 136 or greater 250 or greater