In open water, when the wind blows continuously as happens in the Southern Hemisphere in the Roaring Forties, long, organised masses of water called swell roll across the ocean.
Ở vùng nước mở, khi gió thổi liên tục (như ở Nam bán cầu trong Roaring Forties), kéo dài, organised masses of water called swell roll across the ocean.