Accumulated Cyclone Energy
Accumulated cyclone energy (ACE) is a measure used by the National Oceanic and Atmospheric Administration (NOAA) to show the activity of each tropical cyclones and entire tropical cyclone seasons, particularly the Atlantic hurricane seasons. It uses an estimation of the energy used by a tropical system over its lifetime and is calculated in every six hours.
- NOAA ACE by year from 1851
- National Climatic Data Center - Atlantic Basin 2004 Accumulated Cyclone Energy (ACE) Index
- National Climatic Data Center — Atlantic Basin 2005 Accumulated Cyclone Energy (ACE) Index
- 2004 Pacific NW Typhoon Season ACE pdf
- Global Tropical Cyclone Best Track Database
- Hurricane Metrics