A word for “violent wind” in notes from the late 1950s with variants hwá and hwarwa, based on a strengthened form of the root √WĀ “blow”: ✶swa-swa (NM/237). I think the longer form hwarwa is preferable.
Sindarin
hwá
breeze
Quenya
hwá
noun. violent wind
hwarwa
noun. violent wind
n. #breeze. >> hwa