ɪf ðɛɹ ɪz ɐ swˈɛl ʌv sɪɡnˈɪfɪkənt hˈaɪt ðæt ɪz hˈɛdᵻd ɪnðə dᵻɹˈɛkʃən ʌvðə bɹˈeɪk juː ɑːɹ fˈɔːɹkæstɪŋ fɔːɹ, ðˈɛn ðɛɹ pɹˈɑːbəbli wɪl biː ɡˈʊd sˈɜːf.
If there is a swell of significant height that is headed in the direction of the break you are forecasting for, then there probably will be good surf.