code_name,Wave Period
units,WMO code 3155
0,20 OR 21 SECONDS
1,OVER 21 SECONDS
2,5 SECONDS OR LESS
3,6 OR 7 SECONDS
4,8 OR 9 SECONDS
5,10 OR 11 SECONDS
6,12 OR 13 SECONDS
7,14 OR 15 SECONDS
8,16 OR 17 SECONDS
9,18 OR 19 SECONDS
10,CALM OR PERIOD NOT DETERMINED