Hawaii Assesses Billion-Dollar Damage From Worst Flooding in Two Decades as New Downpours Hit Oahu

The floodwaters came without warning in the predawn hours of last Friday, rising so fast on Oahu's famed North Shore that residents fled on surfboards through chest-high torrents. By the time the sun came up over Waialua and Haleiwa, entire neighborhoods sat buried under thick layers of reddish volcanic mud, cars floated in driveways, and homes had been swept clean off their foundations Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend..

Hawaii is now confronting the aftermath of its worst flooding in more than twenty years, a disaster that Governor Josh Green said on Friday could cost the state more than one billion dollars in damage to airports, schools, roads, homes and a hospital on Maui Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend.. On Monday, as North Shore residents began the exhausting work of clearing debris and salvaging belongings, a fresh band of intense showers struck Oahu's south side, transforming streets in the university neighborhood of Manoa into fast-moving rivers and pushing stream gauges back into flood stage.

A storm of historic proportions

The catastrophe began building earlier this month when a winter storm system soaked the Hawaiian islands, saturating the soil. When a second round of heavy rain arrived last week — driven by subtropical weather patterns known as Kona lows, which carry moisture-laden air from the south and southwest — the ground had no capacity left to absorb it Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend.. Parts of Oahu received between eight and twelve inches of rainfall in a matter of hours, according to the National Weather Service, and the runoff rushed downhill with devastating force Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend..

On the North Shore, the waters rose after midnight on Friday, catching many residents asleep. Evacuation orders went out for approximately 5,500 people living north of Honolulu Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend.. Rescue teams working by helicopter and boat pulled more than 230 people from the rising water over the following days. Remarkably, no deaths have been reported so far Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend..

Michael McEwan and his wife Heather Nakahara were among those trapped. The couple huddled with their two small terriers and three parrots in a bedroom closet in their Waialua home for eight hours as water surged around them. At daybreak on Friday, McEwan managed to flag down firefighters, who tied a rope to a tree beside the bedroom and guided the couple through a narrow channel of flowing water to safety. When they returned over the weekend, they found their kitchen counters coated in red silt, furniture piled against hallway walls, and unfamiliar tables deposited in their backyard by the current.

Destruction across the islands

The damage extended far beyond the North Shore. On Maui, authorities upgraded an evacuation advisory to a full warning for parts of Lahaina — a community still rebuilding from the devastating 2023 wildfire — after retention basins there neared capacity Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend.. Officials cautioned that a 120-year-old dam in Wahiawa, roughly seventeen miles northwest of Honolulu, was at risk of failure as water levels climbed. That threat subsided over the weekend as levels fell, but emergency management spokesperson Molly Pierce warned that the situation remained precarious given how saturated the ground was across the island Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend..

The agricultural sector has taken a particularly severe hit. A survey conducted by Agriculture Stewardship Hawaii, the Hawaii Farm Bureau and partner organizations tallied more than $9.4 million in farm damage statewide as of Monday. Oahu farmers alone reported more than $2.7 million in crop losses. Racquel Achiu, a Waialua farmer who stayed behind to care for her livestock, found her goats standing in knee-high water on Thursday night. An hour later, her family's seven dogs were in danger of drowning in an elevated kennel, and her nephew and son-in-law waded through chest-high water to rescue them Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend..

Hundreds of homes have been damaged across Oahu and Maui, though officials have yet to complete a full assessment of the destruction. Schools were closed, sections of road collapsed — including a stretch in Makaha Valley that gave way beneath vehicles — and Kula Hospital on Maui sustained flood damage.

Monday's fresh flooding raises new concerns

Just as residents thought the worst had passed, an intense band of showers swept across Oahu's south side on Monday afternoon. In the Manoa neighborhood, where a flood in 2004 inundated homes and a University of Hawaii library, streams surged back into flood stage within minutes. Natalie Aczon, who had stepped into a pharmacy to pick up medication for her mother, emerged fifteen minutes later to find a river of water roaring down the adjacent street. A man ran out of the store and pointed at a white sedan being carried by the current, telling bystanders it was his car.

Manoa stream overflowed its banks again, Pierce confirmed, though water receded more quickly than in the North Shore events. The episode underscored the ongoing vulnerability of the state's infrastructure. Pierce noted that the sheer saturation of the soil meant the smallest amount of additional rainfall could trigger dangerous flooding. All the water just flows, she said, because there is simply no absorption capacity remaining.

Federal response and political debate

Governor Green said his chief of staff had spoken with the White House and received assurances of federal support. The governor compared the disaster's severity to the 2004 flooding, calling it the most serious the state has faced in more than two decades Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend.. Green also drew parallels to the recovery challenges that followed the Lahaina wildfire, suggesting the rebuilding process could stretch over months or years.

The response has drawn scrutiny from some quarters. Questions are being raised about the condition of aging infrastructure, particularly the Wahiawa dam, which has been flagged as vulnerable for decades. Critics argue that repeated cycles of deferred maintenance have left communities exposed to preventable risks. Defenders of the state's emergency management point to the zero-fatality outcome and the speed of rescue operations as evidence that preparedness measures worked, even if the physical damage was enormous.

At the federal level, debate is likely to intensify over disaster funding mechanisms. Hawaii's geography makes it uniquely expensive to rebuild, with materials and labor commanding premium prices due to shipping costs. The billion-dollar damage estimate places this event among the costliest natural disasters in the state's history.

Climate patterns and the road ahead

Scientists have linked the increasing intensity and frequency of heavy rainfall events in Hawaii to broader climate trends. The Kona low systems responsible for the past two weeks of deluges are not unusual in themselves, but researchers say warming ocean temperatures are loading these weather patterns with more moisture, producing heavier downpours when they do arrive Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend..

By Sunday afternoon, the worst of the initial storm appeared to have passed, according to Hawaii meteorologist Matthew Foster, who told the Associated Press that conditions had shifted from widespread showers to more scattered rain. Less than five inches of additional precipitation was expected for Hawaii Island, with one to two inches elsewhere. Foster cautioned that isolated flooding could still occur, but projected drier and more typical March weather by Wednesday Hawaii urges residents to ‘leave now’ amid worst flooding in over 20 yearstheguardian.com·SecondaryPeople in hard-hit areas of Oahu and Maui told to evacuate with still more rain expected over the weekend As Hawaii endures its worst flooding in more than 20 years, officials urged people in hard-hit areas to “LEAVE NOW”. That warning early on Saturday came after heavy rains fell on soil already saturated by downpours from a winter storm a week ago, and still more was expected over the weekend..

For the thousands of residents now facing the cleanup, the timeline offers little comfort. The thick volcanic mud that coats homes, roads and farms across Oahu's North Shore does not wash away easily. Many families will need to gut water-damaged interiors, and some structures may prove unsalvageable. Relief organizations including Convoy of Hope have begun deploying resources, and community volunteers have turned out in large numbers to help neighbors.

The immediate question is whether the state's infrastructure can handle any further strain. With the ground still saturated, even routine spring showers carry the potential to trigger localized flooding. Emergency officials have urged residents across all islands to remain vigilant and to avoid complacency during breaks in the weather. As Pierce put it earlier this week: even if it is blue skies where you are, if rain is falling on the mountain, it is coming to you soon enough.