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Kona Low Begins Drenching Hawaii as Second, Stronger Round Nears

Forecasters warn of a high‑impact, potentially life‑threatening pattern capable of widespread 5–8 inches of rain, with isolated totals above 20 inches.

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Visitors stand in the rain at an overlook for Rainbow Falls during a tropical storm in August 2018 in Hilo, Hawaii. The islands will see torrential rain this week from a weather phenomenon known as a Kona low.
People hold umbrellas as it begins to rain on an otherwise empty beach in Honolulu in December 2021. Honolulu could get 10 inches of rain through Saturday, with far more falling on mountaintops in Hawaii.
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Overview

  • Flood Watches covered almost all of Hawaii on Tuesday, with heavy rain reaching Kauai during the day and Oahu by night before spreading east.
  • A brief lull is expected Thursday, then a stronger disturbance Friday into Saturday is forecast to greatly increase the risk of major flooding and damaging winds.
  • Late‑week severe thunderstorms could produce hail, damaging winds and isolated tornadoes, and meteorologists highlight landslide danger.
  • Gov. Josh Green issued an emergency proclamation as officials closed some state parks and began evacuating campers on Kauai and Oahu.
  • Summits on the Big Island are expected to receive significant snow with possible blizzard conditions, and strengthening south to southwest winds could trigger power outages.