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I'm thinking more like 30 foot wave () but since you live in CA and I'm landlocked by about 1,000+ miles on every direction I'll have to defer back to you :-)
Where exactly were you when you took this? On a board, in a boat,....?
Waves are typically measured on the back... this would be a 20' wave, measured on the back (or as another poster mentioned '20' Hawaiian'), but the face is definitely closer to 30