July 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)
Northeast Pacific
 Blas-04 7/12/04 7/15/04 TS 50 65 2.72 x 104
Northeast Pacific
 Celia-04 7/19/04 7/25/04 Cat 1 70 85 8.47 x 104
Northeast Pacific
 Darby-04 7/26/04 8/1/04 Cat 3 105 130 17.51 x 104
Northwest Pacific
 Kompasu-04 7/13/04 7/18/04 TS 45 55 1.70 x 104
Northwest Pacific
 Mindulle-04* 6/23/04 7/4/04 Cat 4 125 150 2.85 x 104
Northwest Pacific
 Namtheun-04 7/25/04 8/1/04 Cat 4 115 140 16.45 x 104
Northwest Pacific
 Ting Ting-04* 6/25/04 7/3/04 Cat 1 80 100 3.33 x 104

*Note that the ACE Indices for Mindulle-04 and Ting Ting-04 are for July only. See the June ACE Index Table for the June index values for these two storms.



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