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Why an immense marine heatwave off the US west coast has alarmed scientists
What does a surge in ocean temperatures, compounded with El Niño, bode for the summer?

TL;DR
- A major marine heatwave is present off the US west coast.
- The El Niño phenomenon is compounding the ocean temperature surge.
- Scientists are alarmed by these conditions.
- The heatwave could significantly impact the upcoming summer.