Hawaii Braces for Flooding as Hurricane Nolo Strengthens South of the Islands
Goldlaner.com – Heavy bands of rain from Hurricane Nolo are moving into southern Hawaii, raising renewed concerns about flash flooding and mudslides after a punishing stretch of tropical weather across the state. The storm marks Hawaii’s third serious hurricane threat in six weeks, with the Big Island expected to face the most hazardous conditions as Nolo passes to its south on Saturday local time.
Nolo strengthened quickly into a Category 2 hurricane on Friday and was still holding that intensity Saturday morning. Forecasters expect it to make its nearest pass to the Big Island as either a powerful Category 2 system or a Category 3 major hurricane. While its core is projected to remain offshore, the storm’s outer rainbands are already affecting the island and are expected to reach Maui, Lanai and Molokai.
Rainfall poses the greatest danger
The principal threat is extreme rainfall, particularly over the Big Island’s eastern and southern areas. Eight to 12 inches of rain could fall there through Sunday, while the steepest terrain may receive as much as 16 inches. The island’s mountainous landscape can intensify rainfall as moist air is forced upward, creating a heightened risk of fast-rising water, debris flows and landslides.
Rainfall is expected to be lower on the Big Island’s western side, though totals could still reach 6 inches. Eastern Maui could receive 4 to 6 inches, with isolated locations seeing up to 8 inches. Other main islands may collect roughly 1 to 3 inches.
These projections arrive while many areas remain vulnerable from recent storms. Hurricane Lala passed near the Big Island in mid-August as a Category 1 hurricane and produced more than 40 inches of rain in some mountain areas. The resulting flash flooding was catastrophic, and recovery efforts are still under way. Earlier in September, Category 2 Hurricane Lowell brought damaging conditions to Kauai and Niihau.
“If your home flooded before, or is at risk, consider moving to safer shelter before the full force of the storm hits,” Hawaii County Mayor Kimo Alameda said in a Wednesday news release. “Because the ground remains saturated, flooding may happen rapidly.”
Saturated soil is especially important in this storm. Even rain totals below those produced by Lala can trigger dangerous runoff when the ground has little capacity left to absorb water. Residents near streams, steep slopes, low-lying roads and locations affected by earlier flooding face the greatest immediate concern.
Winds, rough surf and disruptions expected
Nolo’s most intense sustained winds are forecast to stay over open water because the hurricane will pass well south of the Big Island. Nevertheless, elevated terrain could experience tropical-storm-force winds above 40 mph on Saturday, and gusts exceeding 75 mph cannot be ruled out in exposed locations.
Dangerous ocean conditions are also building offshore. Seas are expected to be at their worst Friday and Saturday, with rough surf and hazardous marine conditions likely to continue through the weekend and into next week. Those conditions may persist even after Nolo begins turning westward away from the islands late Sunday into Monday.
Hawaii Gov. Josh Green issued a state of emergency ahead of Nolo, the third weather-related emergency declaration this month. President Donald Trump approved Hawaii’s request for a pre-landfall Presidential Emergency Declaration, Green said Friday.
Government offices, public schools and the University of Hawaii were closed Thursday and Friday on the Big Island. Maui closures were also scheduled for Friday. Transportation plans may shift as the storm evolves, and Maui bus service is expected to be suspended at varying times through the weekend.
Emergency resources positioned across the state
About 400 National Guard troops have been placed around Hawaii in preparation for Nolo, including 121 stationed on the Big Island. Hawaii County has opened shelters, while the state has reserved 100 hotel rooms for Big Island residents who choose to leave vulnerable homes.
The emergency response comes as many residents are still displaced by earlier disasters. Department of Human Services director Joseph Campos said statewide that hundreds of people continue to stay in hotels after being forced from their homes by events including hurricanes Lala and Lowell.
On Maui, local agencies have been preparing generators and response equipment while adding staff at police and fire departments. The preparations reflect the possibility that rain, wind and transportation disruptions could affect more than one island even if the hurricane’s center remains offshore.
A season shaped by unusually favorable storm conditions
Nolo is developing during a Pacific season influenced by a super El Niño. Extremely warm ocean water can provide energy for tropical systems, while reduced wind shear allows storms to organize and maintain strength more easily. This combination has helped create an environment favorable for powerful cyclones.
Its rapid strengthening also reflects a broader concern in a warming climate. Rapid intensification occurs when a storm’s maximum sustained winds increase by at least 35 mph within 24 hours or less. Such episodes are becoming more common as fossil fuel pollution warms the planet and raises ocean temperatures that can fuel hurricanes.
For Hawaii, the immediate message is that Nolo’s exact path does not eliminate the danger. A storm passing offshore can still deliver destructive rain, powerful gusts in higher terrain and life-threatening surf. Residents are being urged to monitor local warnings, avoid flooded roads and take evacuation guidance seriously as the hurricane makes its closest approach.
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