1) Billowing 2) In swelling surges 3) Stormy 4) Surging 1) Stormy 2) Surging 3) Surgy 
• (a.) Of or pertaining to billows; swelling or swollen into large waves; full of billows or surges; resembling billows.
Bil'low·y adjective Of or pertaining to billows; swelling or swollen into large waves; full of billows or surges; resembling billows. « And whitening down the many-tinctured stream, Descends the billowy foam. Thomson. » 
[adj] - characterized by great swelling waves or surges
billowing(a) adjective characterized by great swelling waves or surges; `billowy storm clouds`; `the restless billowing sea`; `surging waves`
characterized by or full of billows; surging: a rough, billowy sea.