While the storm moved generally northwest, Harvey's intensification phase stalled slightly overnight from August 24–25; however, Harvey soon resumed strengthening and quickly became a major hurricane and attained Category 4 intensity later that day.
Sementara badai bergerak secara umum ke barat laut, fase intensifikasi Harvey terhenti sedikit dalam semalam dari 24-25 Agustus; namun, Badai Harvey segera melanjutkan penguatan dan dengan cepat menjadi hurikan besar dan mencapai intensitas Kategori 4 di kemudian hari.