Kona Storm Causes Damage Across Hawaiʻi

A powerful kona low battered the Hawaiian Islands last week, unleashing torrential rain that caused widespread flooding, landslides, sinkholes, road closures and downed power lines.

Governor Josh Green declared a State of Emergency in Hawaiʻi.

The National Oceanic and Atmospheric Administration (NOAA) explains that a kona low, or kona storm, typically forms during the winter months. The system is a type of low-pressure weather pattern that develops northwest of the Islands and can stall near them.

Unlike Hawaiʻi usual trade winds, a kona low brings cooler, moisture-rich winds from the south to southwest. This unusual wind direction can produce significant rainfall. NOAA notes that Leeward areas, which typically receive less rain, may face greater risk for landslides and flooding due to shallower soil and less vegetation cover.

The storm last week stalled north of the Islands for nearly five days, producing record-breaking rainfall. In West Maui, gauges recorded 28 inches at Puʻu Kukui in five days. Totals reached more than 40 inches in Upcountry Maui.

 

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According to the National Weather Service, as the kona low moves away from the Hawaiian Islands, periods of moderate showers may continue to linger over Maui and the Leeward Side of Hawaiʻi Island. Forecasters also warn that another round of heavy rain could develop later this week as a new area of low pressure forms west of the Islands.

The public is urged to continue exercising caution, especially near flooded roadways, streams and areas experiencing strong winds. Travelers should expect delays or cancelations as conditions continue to impact flights and transportation.