Epiginomai combines epi (upon) + ginomai (to become, come to be). It means to come upon suddenly — often used of weather or natural forces that spring up unexpectedly. It appears only once in the NT (Acts 28:13), describing a south wind that came to Paul's rescue during his voyage to Rome.
The small details of Paul's sea voyage in Acts 27-28 are filled with theological meaning. After being storm-tossed and shipwrecked, a south wind comes upon them — a providential gift. Luke uses epiginomai to describe this meteorological turning point. The wind that "came upon" the disciples at Pentecost (a different word, pherō) filled them with power. The Spirit, like the wind, comes suddenly and cannot be controlled — only received. God's providential care over Paul's journey to Rome shows that even the wind serves His purposes.