code_name,Sea State units,WMO code 3700 0,CALM-GLASSY 0 FT (0 METERS) 1,CALM-RIPPLED 0-1/3 FT (0-.1METERS) 2,SMOOTH-WAVELET 1/3-1 2/3 FT (.1-.5 METERS) 3,SLIGHT 1 2/3 - 4 FT(.5-1.25 METERS) 4,MODERATE 4-8 FT(1.25-2.50 METERS) 5,ROUGH 8-13 FT(2.50-4.0 METERS) 6,VERY ROUGH 13-20 FT(4-6 METERS) 7,HIGH 20-30 FT(6-9 METERS) 8,VERY HIGH 30-45 FT(9-14 METERS) 9,PHENOMENAL >45 FT (>14 METERS)