Record-breaking rainfall on the Hawaiian Islands of Kauaʻi and Oahu
2018 Hawaii floods
Radar loop of mesoscale convective system striking Oahu on April 13
Date
April 13–15, 2018
Location
Kauai, Oahu (Hawaii)
Deaths
None reported
Property damage
$125 million (2018 USD)[nb 1]
In April 2018, a series of thunderstorms produced record-breaking rainfall on the Hawaiian Islands of Kauaʻi and Oahu. An upper-level low moved across the area on April 13, generating a mesoscale convective system that moved over eastern Oahu, producing localized heavy rainfall that reached 5.55 in (141 mm). The heaviest rainfall occurred on northern Kauaʻi. There, a rain gauge owned by the Waipā Foundation, just west of Hanalei, recorded 49.69 in (1,262 mm) of rainfall in the 24 hours between 12:45 p.m. on April 14 and 15.[nb 2] This was the greatest 24-hour rainfall total on record in the United States, surpassing the previous record of 43 in (1,100 mm) in Alvin, Texas on July 25–26, 1979, set during Tropical Storm Claudette. Through the event, the same gauge recorded a total of 54.37 in (1,381 mm) of rain.
The heavy rainfall produced flash flooding and landslides that covered roads and washed away several vacant houses. The floods damaged or destroyed 532 houses. Public damage totaled $19.7 million and overall damage was estimated at over $125 million. Damage on Kauai was the worst from a natural disaster since Hurricane Iniki in 1992. Landslides and flooding covered parts of Kuhio Highway.
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