“From all of what I’ve seen this has been the worst flood event I’ve ever seen my 49 years here on Hanalei,” Alex Diego told the Garden Island newspaper. “The house got water in it for the first time ever.”
To verify the accuracy of the measurement, the National Climate Extremes Committee will review the gauge site specifics and data, which is owned and operated by the Waipa Foundation and is used for watershed modeling. According to Christopher C. Burt, a weather historian at Weather Underground, the record is “plausible given the weather at the time and the region in question’s climatology” as one of the rainiest places on Earth.
The rain was caused by an upper-level low situated to the west of Kauai. The setup tapped into enhanced moisture in the lower levels of the atmosphere and created “intense anchored thunderstorms over the mountains of interior Kauai,” according to Robert Ballard, a meteorologist with the National Weather Service in Hawaii.
And what is perhaps most interesting about the potential record, said Burt, is that it was not associated with a tropical cyclone or hurricane. The current world record for 24-hour rainfall came from Tropical Storm Denise in the Indian Ocean and lashed the island of La Reunion with an almost unbelievable 71.85 inches in 1966.
Here is a list of other top 24-hour-rainfall records, all of which were related to a tropical storm or hurricane except for Waipa:
71.85 inches — Foc-Foc, La Reunion (Jan. 7-8, 1966)
66.49 inches — Belouve, La Reunion (Feb. 27-28, 1964)
64.33 inches — Isla Mujeres, Mexico (Oct. 21-22, 2005)
62.33 inches — Aurere, La Reunion (April 7-8, 1958)
55.20 inches — Weiliaoshan, Taiwan (Aug. 8, 2009)
55.04 inches — Commerson, La Reunion (Feb. 25, 2007)
51.85 inches — Kaikawa, Tokushima, Japan (Aug. 1, 2004)
49.69 inches — Waipa, Hawaii (April 14-15, 2018)*
* if certified
(Data provided by Christopher C. Burt.)
This is the same storm that we reported on several weeks ago that dumped a record 27.52 inches of rain in 24 hours on the town of Hanalei, one mile to the east of Waipa. The flash flooding and mudslides that resulted destroyed roads and bridges, cutting off locals and stranding thousands of tourists. Numerous homes across the island were destroyed or damaged, and Hawaii lawmakers have set aside $100 million for cleanup costs.