Oct 4, 2016
The combination of upper-level instability and tropical moisture, some of which were remnants from former Tropical Storm Ulika, generated heavy rain and isolated thunderstorms over the parts of the Big Island of Hawaii, Maui, and Oahu. The precipitation produced small stream and drainage ditch flooding, and ponding on roadways. However, on the Big Island in the evening of the 4th and the morning of the 5th, the almost non-stop rain caused some areas around Hilo Bay to be submerged under 2 feet
Source: NOAA National Weather Service Storm Events Database (event 660261). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Hawaii County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.