June 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)
Northwest Pacific
 Chanthu-04 6/9/04 6/13/04 Cat 1 75 90 4.16 x 104
Northwest Pacific
 Conson-04 6/4/04 6/11/04 Cat 2 95 115 11.17 x 104
Northwest Pacific
 Dianmu-04 6/13/04 6/21/04 Cat 5 155 190 36.85 x 104
Northwest Pacific
 Mindulle-04 6/23/04 7/4/04 Cat 4 125 150 18.94 x 104
Northwest Pacific
 Ting Ting-04 6/25/04 7/3/04 Cat 1 80 100 8.33 x 104




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