[1] A strong low-pressure system fed by abundant moisture from the tropics fueled slow-moving storms that dropped inches of rain per hour in certain areas.
[3] More than 7.5 inches of rain fell in Haiku in the 24 hours ending at 8:45 a.m. March 10, according to the National Weather Service.
[6][7] Flash Flood Warnings, watches, and advisories were also issued by the National Weather Service (NWS).
[12] The Waiahole Stream, located above the Kamehameha Highway, reported flow rates of nearly 9,000 cubic feet per second.
[16] In response to the rising floodwaters, Kamehameha Highway was closed in both directions near Kualoa Regional Park.
[16] Kamehameha Highway at the Waikane Bridge was also temporarily closed in both directions due to flooding, but was reopened an hour later.
[19] Following the heavy rains and floods on Oahu, the Salvation Army scheduled outreach events in Haleiwa and Hauula to help impacted residents.