amm15-wave-data-product-sheet.pdf
(s) Averaging Freq. Level(s) Leadtimes WAV*hi primary_swell_wave_from_direction instant hourly surface T-48 => T+143 WAV*hi primary_swell_wave_mean_period instant hourly surface T-48 => T+143 WAV*hi primary_swell_wave_significant_height instant hourly surface T-48 => T+143 WAV*hi