2008 Western North Pacific Ocean Tropical Storms and Typhon's

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)
01W 01/14/08 01/14/08 TS 35 45 0.3675 x 104
Neoguri 04/15/08 04/19/08 Cat 2 95 115 8.9556 x 104
Rammasun 05/07/08 05/13/08 Cat 4 135 165 17.4850 x 104
Halong 05/16/08 05/21/08 Cat 1 70 85 4.9606 x 104 05/18/08 - northern Philippines (45 kt)
Matmo 05/15/08 05/16/08 TS 40 50 .4425 x 104
Nakri 05/27/08 06/03/08 Cat 4 125 150 18.9750 x 104
Fengshen 06/18/08 06/25/08 Cat 2 95 115 11.2081 x 104 06/27/08 - Eastern Philippines (76 kt)
Kalmaegi 07/15/08 07/18/08 TS 55 70 5.1975 x 104 07/18/08 - Eastern China Fujian Province (50 kt)
Fung Wong 07/25/08 07/28/08 Cat 2 95 N/A 6.7000 x 104
Kammuri 08/04/08 08/06/08 TS 50 65 1.7950 x 104
Vongfong 08/15/08 08/16/08 TS 50 65 1.4600 x 104
Nuri 08/18/08 08/22/08 Cat 2 95 115 9.9925 x 104 08/20/08 - Philippines Island (76 kt)
08/22/08 - Hong Kong (49 kt)
Sinlaku 09/08/08 09/20/08 Cat 4 125 150 19.8525 x 104 05/18/08 - northeastern Taiwan (80 kt)
16W 09/10/08 09/11/08 TS 35 45 .2450 x 104
Hagupit 09/19/08 09/24/08 Cat 3 105 130 13.5400 x 104 09/24/08 - Southern China (105 kt)
Jangmi 09/24/08 09/30/08 Cat 4 135 165 19.2775 x 104 09/28/08 - Yilan, Taiwan (100 kt)
Twentyone 09/29/08 09/30/08 TS 45 55 .5275 x 104
Higos 09/30/08 10/01/08 TS 45 N/A .8950 x 104
Twentytwo 10/14/08 10/15/08 TS 35 N/A .3675 x 104
Bavi 10/19/08 10/21/08 TS 50 65 1.6631 x 104
Twentythre 10/18/08 10/19/08 TS 35 N/A .3675 x 104
Dolphin 12/12/08 Active Cat 2 90 110 N/A
*The (ACE) Index calculations are based on preliminary data.

*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 (sustained winds of 34 kt or greater). Note that the official NOAA definition of the ACE Index does not include those periods when the system is characterized as sub-tropical. However, we are including this information to allow for comparison between individual cyclones across all basins, many of which contain records which inadequately distinguish between tropical and subtropical cyclones. For a complete description of the ACE Index see Bell and Chelliah (2006), Journal of Climate (19) 590-612.


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