2004 Eastern North Pacific Ocean Tropical Cyclones
(includes the Central Pacific Warning Area 140°W - 180°)

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)
Agatha 5/22/04 5/25/04 TS 45 55 1.0075 x 104
Blas 7/12/04 7/15/04 TS 50 65 1.3575 x 104
Celia 7/19/04 7/25/04 Cat 1 70 85 4.315 x 104
Darby 7/26/04 8/1/04 Cat 3 105 130 8.7525 x 104
Estelle 8/19/04 8/26/04 TS 60 75 2.680 x 104
Frank 8/23/04 8/26/04 Cat 1 75 90 3.665 x 104
Georgette 8/26/04 8/30/04 TS 50 65 2.9075 x 104
Howard 8/30/04 9/5/04 Cat 4 120 145 12.7475 x 104
Isis 9/8/04 9/16/04 Cat 1 65 80 5.750 x 104
Javier 9/11/04 9/19/04 Cat 4 130 160 26.6875 x 104
Kay 10/6/04 10/4/04 TS 40 60 0.320 x 104
Lester 10/11/04 10/13/04 TS 45 55 0.645 x 104

2004 Total Eastern North Pacific Ocean ACE Index = 70.835 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
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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Last Updated Wednesday, 20-Aug-2008 12:22:58 EDT by David.Levinson@noaa.gov
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