Hawaii has not seen flooding like this in more than 20 years. Across Oahu, floodwaters have damaged homes, closed roads, shuttered schools and overwhelmed emergency services. Damage estimates have already surpassed $1 billion, and the figure is still climbing. With more rain in the forecast through the weekend, conditions on the island’s North Shore and surrounding communities remain dangerous and fluid.
More than 230 people have been rescued since the flooding began. Search-and-rescue operations were still underway Friday night.
Flooding forces evacuations across Oahu
Honolulu Mayor Rick Blangiardi confirmed that dozens of homes were damaged Friday, though a full damage assessment has not yet been completed. Emergency shelters opened across the island to accommodate displaced residents.
At 5:35 a.m. Friday, city officials issued a ‘leave now’ evacuation order for Waialua and Haleiwa, citing dangerous flooding and elevated risk at the Wahiawa Dam. By 9:15 p.m., a second alert went out urging all Waialua residents west of Kaukonahua Stream to evacuate immediately, warning that roads were at risk of failure. Entry into Waialua was halted at 9:30 p.m. and only outbound traffic was permitted.
Approximately 5,500 people remain under active evacuation orders.
The National Guard and Honolulu Fire Department airlifted 72 children and adults who had been attending a spring break youth camp in one of the affected areas. At least 10 people have been hospitalized for hypothermia.
The Wahiawa Dam sits near critical levels
The most urgent concern for officials is the Wahiawa Dam, a 120-year-old structure that has been pushed to near-critical water levels by the sustained rainfall. Authorities warned residents that the dam could collapse or breach without notice, urging anyone still in the area to leave immediately and to carpool because of heavy traffic island-wide.
The dam’s owner said Friday that the structure remained structurally sound, though evacuation orders tied to its condition stayed in effect.
Parts of Oahu received more than 8 inches of rain, with several additional inches expected before conditions improve. Most of the state remains under a flood watch.
A Kona low is driving the relentless rain
The current flooding is being driven by a Kona low, a type of low-pressure system that reverses the typical wind pattern across the Hawaiian islands and draws in heavy rain and gusty winds for communities that rarely experience that kind of weather. A series of these systems has been funneling tropical Pacific moisture over Hawaii since last weekend, and the accumulated rainfall has saturated the ground to a point where water has nowhere to go.
The flooding may be partly connected to broader atmospheric patterns on the mainland. When a heat dome settles over the continental United States, cooler and wetter conditions tend to emerge in adjacent regions. That pattern, currently pushing heat through the West and stormier weather through the East, extends across the Pacific and is keeping Hawaii and Alaska locked in wet, unsettled conditions. Without a significant disruption to the overall pattern, conditions are unlikely to improve quickly.
Roads, hospitals and airports among the casualties
Infrastructure across the island chain took a significant hit. Highways were flooded and closed, schools were shuttered, and a hospital on Maui was among the facilities affected. Emergency sirens sounded along Oahu’s North Shore as water levels rose and homes sustained damage along the coastline.
Gov. Josh Green described the situation as serious, particularly on the northern part of Oahu, and said the coming hours would require close monitoring.
Hawaii’s National Guard has been activated statewide in response to the flooding. Officials are urging residents to stay off roads unless evacuating and to follow all active advisories as conditions continue to develop.
