November 2004: Accumulated Cyclone Energy (ACE*) Index

Ocean Basin Tropical Cyclone Cyclogenesis Date Cyclolysis Date Saffir-Simpson Category Maximum 6-hr Sustained Wind (kt) Maximum 6-hr Wind Gust (kt) Accumulated Cyclone Energy (ACE*) Index (kt2)
North Indian
04A-04 11/4/04 11/7/04 TS 40 50 1.4275 x 104
North Indian
Agni-04 11/28/04 12/3/04 Cat 1 65 80 2.155 x 104 (Nov)
3.30 x 104 (Total)
South Indian
Arola-04 11/8/04 11/13/04 Cat 1 75 90 2.9425 x 104
South Indian
Bento-04 11/21/04 11/29/04 Cat 5 140 170 18.2025 x 104
Northwest Pacific
Muifa-04 11/14/04 11/26/04 Cat 4 115 140 20.175 x 104
Northwest Pacific
Nanmadol-04 11/28/04 12/3/04 Cat 4 130 160 4.0675 x 104 (Nov)
17.6425 x 104 (Total)
Atlantic
Otto-04 11/30/04 12/2/04 TS 45 55 0.16 x 104 (Nov)
1.05 x 104 (Total)


*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
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
155 135 249



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