Timeline of the 2017 Pacific hurricane season | |||||
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![]() Season summary map | |||||
Season boundaries | |||||
First system formed | May 9, 2017 | ||||
Last system dissipated | October 28, 2017 | ||||
Strongest system | |||||
Name | Fernanda | ||||
Maximum winds | 145 mph (230 km/h) (1-minute sustained) | ||||
Lowest pressure | 948 mbar (hPa; 27.99 inHg) | ||||
Longest lasting system | |||||
Name | Fernanda, Hilary and Irwin | ||||
Duration | 10.50 days | ||||
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The 2017 Pacific hurricane season was an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the eastern Pacific Ocean. The season officially started on May 15 in the eastern Pacific—east of 140°W—and on June 1 in the central Pacific—between the International Date Line and 140°W—and ended on November 30. These dates typically cover the period of each year when most tropical cyclones form in the eastern Pacific basin.[1] However, storm formation is possible at any time of the year, as illustrated in 2017 by the formation of the season's first named storm, Tropical Storm Adrian, on May 10. At the time, this was the earliest formation of a tropical storm on record in the basin.[2]
Four time zones are utilized in the basin: Central for storms east of 106°W, Mountain between 114.9°W and 106°W, Pacific between 140°W and 115°W,[3] and Hawaii–Aleutian for storms between the International Date Line and 140°W. However, for convenience, all information is listed by Coordinated Universal Time (UTC) first with the respective local time included in parentheses. This timeline includes information that was not operationally released, meaning that data from post-storm reviews by the National Hurricane Center is included. This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season.
May 9
May 10
May 11
May 15
May 31
June 1
June 2
June 11
June 12
June 13
June 24
June 25
June 26
June 27
June 28
July 7
July 9
July 10
July 11
July 12
July 13
July 14
July 15
July 17
July 18
July 19
July 20
July 21
July 22
July 23
July 24
July 25
July 26
July 27
July 28
July 31
August 1
August 4
August 5
August 11
August 12
August 13
August 18
August 19
August 20
August 21
August 22
August 23
August 30
September 1
September 2
September 3
September 11
September 13
September 16
September 17
September 18
November 30