El Niño and La Niña get talked about as weather trivia, but for surfers they're a real, seasonal-scale signal — they shift where Pacific storm tracks run, which changes how much swell reaches different parts of the coast in a given year.
What these patterns actually are
El Niño and La Niña describe shifting ocean temperature patterns in the equatorial Pacific that influence storm tracks across the entire ocean basin, including the storms responsible for the swell that reaches the U.S. West Coast. They cycle over a period of years, not seasons, which means a given surf season can be shaped by whichever pattern happens to be active.
Why this matters more in winter
Most West Coast groundswell comes from winter storm systems tracking across the North Pacific. When these patterns shift the storm track further north or south than usual, some regions end up with a more active winter than normal, while others see a quieter one — even though nothing changed locally.
What this means practically
If a season feels unusually flat or unusually active compared to what you remember from previous years, it's not necessarily your memory playing tricks — broader Pacific patterns genuinely do shift year to year in ways that affect how much swell reaches the coast. It's one more reason a single day's forecast only tells part of the story.
For the storm mechanics behind all of this, see How Storm Systems in the Pacific Create Swell for the West Coast.
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