Valmiki Ramayana Sundara Kanda Sarga 1 Shloka 70

बलवान् forceful, कपिवातश्च wind generated by the swift movement of the monkey, निःसृतः rushing towards, मेघवातश्च and the wind of the clouds, भीम निर्घोषम् creating dreadful sounds, सागरम् ocean, भृशम् violently, कम्पयामासतुः both started agitating.

The forceful wind generated by the monkey moving swiftly, and by the clouds agitated the ocean violently, creating dreadful sounds.