The National Weather Service has issued a Flood Watch for all Hawaiian islands as a developing low-pressure system, described as a kona low, brings increasing moisture and instability to the region from Wednesday, April 8, through Friday, April 10, 2026. Excessive rainfall may lead to flash flooding, runoff impacts, and landslides across all major islands.
A 71-year-old woman was reported missing after being swept into the Iao Stream on Maui, Hawaii, at about 11:40 LT on March 21, 2026, while heavy rainfall kept the stream in rapid flow. Witnesses said she became fully submerged and was not seen again. Search operations continued on March 22 using ground, air, and ocean assets.
Storm damage in Hawaii could exceed USD 1 billion as severe flooding from a Kona low affects Oʻahu on March 20–21, 2026, forcing about 5 500 residents to evacuate and triggering emergency warnings over the imminent risk of failure at Wahiawā Dam.
Wahiawa Dam on Oʻahu, Hawaii, was placed under an imminent failure risk alert on March 20, 2026, prompting emergency evacuations in downstream communities, including Haleiwa and Waialua.
Life-threatening flash flooding struck Oʻahu’s North Shore, Hawaii, on March 20, 2026, after a slow-moving Kona low produced more than 330 mm (13 inches) of rain in parts of northern Oʻahu in about 12 hours from the evening of March 19 into the morning of March 20. Flooding in the Haleiwa and Waialua areas cut off road access, prompted evacuation orders, and triggered emergency response operations.
A second Kona low is expected to affect the Hawaiian Islands beginning the evening of March 19, 2026, bringing additional rainfall to areas already impacted by record-breaking flooding from a previous storm. A Flood Watch is in effect from 18:00 LT on March 19 through 18:00 LT on March 22 for Maui County, Oʻahu, and Hawaiʻi Island.
A slow-moving Kona low brought extreme rainfall to the Hawaiian Islands between March 10–16, 2026, producing record-breaking totals at multiple long-term stations, particularly on Maui and Oʻahu. Honolulu and Kahului both set new daily rainfall records on March 13, while multi-day accumulations on Maui reached up to about 1 170 mm (46 inches), triggering flooding, landslides, and widespread disruption.
Over 130 000 electricity customers across Hawaii lost power on March 13, 2026, as a powerful Kona low brought heavy rainfall, damaging winds, and thunderstorms to the islands. Wind gusts up to 126 km/h (78 mph) were recorded on Oʻahu while forecasters warned rainfall totals of 250–500 mm (10–20 inches) could raise the risk of flash flooding.
A powerful Kona low on Friday, March 13, 2026, bringing widespread severe weather across the islands. The National Weather Service issued a Winter Storm Warning for the Big Island summits, where heavy snow and ice are forecast above 3 350 m (11 000 feet). Forecasters warned that persistent rainfall bands and severe thunderstorms could trigger flash flooding while damaging wind gusts affect multiple islands.
A powerful Kona low is bringing a multi-day flood and severe weather threat to Hawaii on Wednesday, March 11, 2026, with the most dangerous conditions forecast for Friday into Saturday. The National Weather Service says the storm could produce flash flooding, damaging winds, and strong to severe thunderstorms across the island chain, while Governor Josh Green has issued two emergency proclamations tied to the event.
