1.   Colored flags flapped in a heavy sea wind.

2.   He treads water in heavy seas, yelling to search planes overhead.

3.   In the echoing corridors the booming of the heavy sea formed a constant background.

4.   It would be much worse when we were in a heavy sea, when the entire cabin could flood.

5.   Really heavy seas can force cancellation of services.

6.   Search and rescue efforts were hampered Friday by rain and heavy seas.

7.   The boat capsized in heavy seas.

8.   The cliffs are being constantly eroded by heavy seas.