Associated Press “Towering waves in Hawaii crash into homes, barrel through wedding venue” https://www.theguardian.com/us-news/2022/jul/18/hawaii-waves-swell-south-pacific
米国国立気象局（National Weather Service）*1のクリス・ブレンクリー氏の話を中心に；
Chris Brenchley, the meteorologist in charge at the National Weather Service office in Honolulu, said several factors came together to create such huge waves.
“Waves over 12 or 15ft (3.66 or 4.57m), those become extremely big and really rare to have,” he said. “It’s the largest it’s been in several decades.”
Brenchley said the swell was produced in the South Pacific, where it’s currently the winter season.
“They had a particularly strong winter storm where the winds were focused directly towards places like Samoa and then further on to the north into Hawaii,” he said.
Remnants of Hurricane Darby passed south of Hawaii but had no major impact on the surf, he said.
While singular events like this hard to pin directly to climate change, Brenchley said the warming planet is playing a role.
“The most direct type of impact that we can use with climate change is the sea level rise. Any time you add just even small amounts of water, you raise that sea level just a little bit,” he said. “And now those impacts will be exacerbated whenever we have a large storm event or a ... high, high tide.”
Most large summer swells that come from the south are no bigger than about 10ft (3m), which would trigger a high surf advisory.
“We had some waves that were reaching 20ft (6m), 20ft-plus even,” Brenchley said. “That’s getting on the level of historic.”