2006 Pacific hurricane season

Season timing and basin boundaries

The season is defined by conventional start and end dates. In the eastern Pacific basin — the region east of 140°W — the season officially ran from May 15 through November 30. The central Pacific basin, between 140°W and the International Date Line, observes an official season from June 1 through November 30. These dates indicate when tropical cyclone formation is most likely; they are maintained by agencies such as the National Hurricane Center and the Central Pacific Hurricane Center. See the eastern Pacific dates here and the central Pacific dates here.

Characteristics and monitoring

Storms in the eastern and central Pacific are monitored by different centers: the NHC covers the eastern Pacific while the CPHC is responsible for the central Pacific. Classification follows standard tropical cyclone terminology: tropical depressions, tropical storms (which receive names), hurricanes, and major hurricanes. The 2006 season stood out for both the number of named storms and the proportion that reached major hurricane status. For basin definitions and operational details, consult the regional descriptions at basin overview and monitoring agencies.

Notable storms and behaviour

Although many 2006 storms remained well offshore, a few were exceptional for their intensity or longevity. The central Pacific produced Hurricane Ioke, which reached Category 5 intensity and maintained powerful winds while crossing large expanses of open ocean. Ioke later traversed the International Date Line and was tracked as a typhoon by western Pacific agencies; it caused notable damage to atoll facilities in the central Pacific. Detailed storm reports and post‑season analyses are available at storm archive.

Impacts and aftermath

Despite the season's high activity, direct landfalls were relatively limited compared with the number of storms. Several systems brought heavy rain to parts of Mexico's Pacific coast, producing localized flooding and agricultural impacts. Remnants of eastern Pacific systems occasionally enhanced rainfall in the southwestern United States. The season prompted reviews of forecasting and preparedness, particularly on remote Pacific islands affected by intense but distant storms. Additional background and impact summaries can be found in the post‑season review linked here.

Overall, the 2006 Pacific hurricane season is remembered for its elevated counts of hurricanes and major hurricanes, and for at least one exceptionally intense central Pacific cyclone that crossed into the western Pacific. The season reinforced the importance of monitoring both the eastern and central basins due to the potential for long‑track, high‑intensity storms to affect remote territories and maritime interests.