Valmiki Ramayana Ayodhya Kanda Sarga 41 Shloka 13

महोदधिः great ocean, कालिकानिलवेगेन इव like windblown dark clouds, उत्थितः aroused, रामे Rama, वनम् to the forest, प्रव्रजिते having been exiled, तत् नगरम् that city (of Ayodhya), प्रचचाल was shaken.

After Rama left for the forest, dark clouds appeared (in the sky) like the (waves of) the great ocean uplifted by the speed of the wind which shook the city.