After degenerating, the spreading plume of Wali's remnant moisture interacted with an unstable air mass beneath the eastern flank of a separate upper trough over the Hawaiian Islands on July 19–20, triggering thunderstorms across the island of Hawaii and then significant rainfall on Oahu. Rainfall totals on Oahu mostly ranged from to , though multiple sites along the windward slopes of the Koolau Range received more, with several receiving over per hour. The rain gage at Kahana Bay Beach showed that fell in a 12 hours. Heavy rainfall also affected Molokai and Maui. Property damage from the storm was reported on Oahu and on Maui. There were no fatalities due to the flooding; however, one fatality related to the rain event was reported when a swimmer drowned in rough seas in Maalaea Bay, near Molokini.
