After months of analysis, the National Climate Extremes Council (NCEC) has declared last year’s incredible rainstorm on the island of Kauai, Hawaii as the all-time record rainfall for a 24 hour period anywhere in the United States. The April 14-15, 2018 rainfall of 49.69″ broke the previous record set of 43.0″ in Alvin, Texas set on July 25-26, 1975. The measurement was recorded on a rain gauge maintained at Waipā Garden.
According to the final report released by NCEC, although the Waipā Garden station is not part of the National Weather Service (NWS) official observing network, the station was known to the local NWS Weather Forecast Office prior to April 2018 as an occasional provider of data for hydrological analysis and post-analysis purposes.
During the heavy rain event in April, pictures shared online show cars and trucks tossed like toys by flood waters, with homes floating out to sea in raging flood waters. The epic downpour created historic floods, destroying beach shacks and multi-million dollar homes in the process. In addition to stunning resorts and incredible views, the stretch of land impacted by the unusual downpour is also home to many high-profile residents. Facebook creator Mark Zuckerberg has a 700 acre sea-side compound in an area that saw more than 15 inches of rain in less than 10 hours. South Park creator Trey Parker also lives in Wailua, which RADAR estimates at least 6″ of rain fell. The record-breaking flooding triggered a massive search/recovery mission for those trapped in the flood-stricken areas.
— the Weatherboy (@theWeatherboy) April 15, 2018
Good news/bad news: Videographer that shared earlier footage of flash floods in Anahola, Kauai is safe and sound, but this was his Jeep 1/2 mile downstream at the ocean before it disappeared. @firebomb56 @NWSHonolulu @bodyboarder22 #hiwx #hifloods #Kauai #PrayForHanalei pic.twitter.com/yc3oni8PuG
— the Weatherboy (@theWeatherboy) April 16, 2018
The full report can be seen here.