*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 (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 |
http://www.ncdc.noaa.gov/oa/climate/research/2005/2005-nw-pacific-trop-cyclones.html
Downloaded Wednesday, 24-Sep-2008 18:50:03 EDT Last Updated Thursday, 22-Jun-2006 10:22:03 EDT by David.Levinson@noaa.gov Please see the NCDC Contact Page if you have questions or comments. |