Our Newest Ocean Hotspot - Reaching From Micronesia To California, w. Temps 6 to 8 Degrees C Above Normal

A massive ocean hot spot is stretching across a 5,000-mile swath of the Pacific — from Micronesia to the coastal waters of California. Across this zone, waters are as much as 6 to 8 degrees above average. And it has the attention of climate scientists, who say it could boost temperatures, humidity and the threat for tropical storms in the West during the months ahead. Climate scientist Daniel Swain described this increasingly extreme marine heat wave as an “exceptional event” that’s breaking records.

The unusual ocean anomaly — the largest on the planet — could expand and intensify to cover the entire Pacific coast of North America by late summer, he wrote.The development of this ocean hot spot, which is linked to a forming El Niño, also follows record warmth and a historic lack of snow in parts of the West earlier this year. Such conditions could worsen as the warm waters influence weather patterns in the coming months.

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As summer approaches, the marine heat wave will probably contribute to elevated overnight temperatures, leading to reduced relief from hot daytime conditions. There’s also increased potential for uncomfortable humidity levels — something that is unusual in the West. Warmer ocean waters increase evaporation, which can raise atmospheric moisture levels, especially along the coast. Then, later in summer, the marine heat wave and a forming El Niño could join forces to boost monsoonal thunderstorm activity across the West. This could enhance fire risks in the region — as dry lightning strikes can spark wildfires.

According to the National Interagency Fire Center, there’s above-average wildfire risk across several Western states during June and July.The marine heat wave could also seriously boost the odds of an active eastern Pacific hurricane season — extending westward toward Hawaii. It will also raise the chances for the remnants of a tropical storm reaching California, which could spread moisture far and wide across the West — like Hurricane Hilary did in 2023.

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https://www.washingtonpost.com/weather/2026/04/22/marine-heat-wave-summer-hurricanes-wildfires/

https://wapo.st/4mPJvpo