Preliminary data downloaded from a remote rain gage in North Kauai indicates that rainfall during the flash flood event on April 14th and 15th, 2018 broke the U.S. 24-hour rainfall record.
The rain gage, located in Waipa, about one west of Hanalei, recorded 49.69 inches of rainfall during the 24-hour period ending at 12:45pmHST April 15th.
This total, if certified, will break the current U.S. 24-hour record of 43 inches at Alvin Texas on July 25th and 26th, 1979, and the state of Hawaii record if 38 inches at Kilauea on January 24th and 25tth, 1956.
The National Climatic Extremes Committee will be convened to review the data and Gage site specifics. The committee will determine data validity and potentially certify the report as a new national record. It is not known at this time how long the certification process will take.
The rain gage is operated by the Waipa Foundation which is a non-profit organization. Data from the gage are not telemetered for real-time display and are used for watershed modeling and monitoring studies.
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