
USA (Hawaii)
The first giant, 1 Nov 2011
Before Garrett McNamara, hardly anyone outside Portugal knew what Praia do Norte could do. A local bodyboarder, Dino Casimiro, had been sending the Hawaiian photos and emails about the waves since 2005. McNamara finally came to see for himself in 2010.
On 1 November 2011 he rode a wave measured at 23.77 metres (78 feet). In May 2012 Guinness World Records confirmed it as the biggest wave ever surfed, and almost overnight Nazaré became the place everyone wanted to see.
He has stayed part of the town's story ever since, and he helps run the Nazaré Big Wave Challenge, watching the swell and deciding when the contest goes ahead.
His 23.77 m world record wave, 1 Nov 2011.
1 November 2011, offshore of Praia do Norte
Our formula says: Giant biggest wave about 15.5 m
Swell from the ERA5 reanalysis (Copernicus / ECMWF) at the hour of the ride. Biggest wave = 1.5 × sets, sets = 2.85 × swell × √(period ÷ 15) on this data scale. How we forecast
One email when giant waves (10 m+) show up in the models, usually 5 to 7 days ahead.
Photos: Luis Ascenso (header), CC BY 2.0; Humor Multishow (Lucas Chianca), CC BY 3.0; Carlos Eduardo Joos (wave photos 1, 2), CC BY 2.0; Walterpeitz (wave photos 1, 2), CC BY-SA 4.0, via Wikimedia Commons.