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May-June 2018

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The 2017 Eastern North Pacific Hurricane Season: A Quiet Year

Tropical cyclone activity in the eastern North Pacific during 2017 was near the long-term average overall. Of the 18 tropical storms that formed, nine became hurricanes and four attained major hurricane strength (Category 3 or higher on the Saffir-Simpson Hurricane Wind Scale). In comparison, the 1981–2010 averages are 15 tropical storms, eight hurricanes, and four major hurricanes. Despite the large number of tropical storms that formed in 2017, many of them were weak and/or short lived. This resulted in an Accumulated Cyclone Energy (ACE) index, a measure that takes into account both the strength and duration of the season's tropical storms and hurricanes, to be near normal at 98% of the long-term median value.


DAVID P. ROBERTS is the United States Navy Hurricane Specialist and RICHARD J. PASCH is a Senior Hurricane Specialist at the National Hurricane Center in Miami, Florida.

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