North Pacific High

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The North Pacific High is a semi-permanent, subtropical anticyclone located in the northeastern portion of the Pacific Ocean, located northeast of Hawaii and west of California. It is strongest during the northern hemisphere summer and shifts towards the equator during the winter, when the Aleutian Low becomes more active. It is responsible for California's typically dry summer and fall and typically wet winter and spring, as well as Hawaii's year-round trade winds.[1][2]

During the 2011–2017 California drought, the North Pacific High persisted longer than usual, due to a mass of warm water in the Pacific Ocean, resulting in the Ridiculously Resilient Ridge. This significantly limited the number of powerful winter storms that were able to reach California, resulting in historic drought conditions in that state for several years.[3][4]

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  1. ^ "Semi-Permanent Highs and Lows". North Carolina Climate Office. Retrieved 13 May 2019.
  2. ^ "North Pacific High". NOAA. Retrieved 13 May 2019.
  3. ^ "The Extraordinary California Drought of 2013/14: Character, Context, and the Role of Climate Change" (PDF).
  4. ^ Bond, Nicholas A.; Cronin, Meghan F.; Freeland, Howard; Mantua, Nathan (2015). "Causes and impacts of the 2014 warm anomaly in the NE Pacific". Geophysical Research Letters. 42 (9): 3414–3420. doi:10.1002/2015GL063306. ISSN 1944-8007.

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