Flood Watch canceled early Monday as the widespread flash flood threat diminished across the Hawaiian Islands, but officials cautioned that lingering moisture and saturated ground could still trigger minor flooding where heavy showers recently fell.
Flood Watch and weekend advisories across the islands
Flood Advisory for Oʻahu until 8:45 p.m., Sunday, April 12, 2026
Forecasters issued a Flood Advisory for Oʻahu through 8:45 p.m. Sunday. At 5:31 p.m., radar indicated light to moderate rain over the island at up to 0.5 inch per hour.
The National Weather Service said showers were expected to persist into the evening, and even lower rain rates could cause ponding on saturated surfaces. The advisory could have been extended if flooding continued.
Flood Advisory for Lānaʻi until 7:30 p.m., Sunday, April 12, 2026
A Flood Advisory was also posted for Lānaʻi through 7:30 p.m. At 5:29 p.m., radar showed heavy rain had eased, with rates up to 1 inch per hour.
Residents were urged to avoid streams, drainage ditches, and low-lying areas. A Flood Watch was also in effect at the time.
Molokaʻi Flash Flood Warning extended until 9 p.m., Sunday, April 12, 2026
The National Weather Service extended a Flash Flood Warning for Molokaʻi until 9 p.m. Sunday. At 5:44 p.m., radar detected heavy showers moving across central and east Molokaʻi with rain rates up to 1 inch per hour.
Water levels in Kawela Gulch were already high, and additional runoff was likely to produce flash flooding.
Areas at risk included Kawela, Kalaupapa National Park, Kaunakakai, Kamalo, Kualapuʻu, ʻUalapuʻe, Hoʻolehua, Pūkoʻo, Hālawa Valley, and Molokaʻi Airport.
Officials urged the public to stay clear of streams, rivers, drainage ditches, and culverts, even if they appeared dry.
Flood Watch through 6 a.m. Monday
A Flood Watch had remained in effect for Kauaʻi, Oʻahu, Maui, Molokaʻi, Lānaʻi, Kahoʻolawe, and Niʻihau through 6 a.m. Monday. Forecasters warned that flood-prone roads and low-lying areas could close due to elevated runoff and overflowing streams, with urban locations facing increased risk of flooding and property damage from rapid runoff.
Deep tropical moisture was entrenched over the state, keeping showers going. Although rainfall rates were generally light, there was potential for higher rates overnight, and heavy showers developed over Maui County.
Overall, the flash flooding threat was decreasing, and the public was advised to monitor updated forecasts from NWS Honolulu and be ready to act if additional Flash Flood Warnings were issued.
