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Storm updates: Tropical Depression 15-E could bring heavy rain to Hawaiʻi this weekend

The five-day forecast for Tropical Depression 15-E as of Wednesday, Sept. 23, 2026 shows the storm system heading north towards the Hawaiian Islands.
NOAA
The five-day forecast for Tropical Depression 15-E as of Wednesday, Sept. 23, 2026 shows the storm system heading north towards the Hawaiian Islands.

HPR is updating this page as new information becomes available. Bookmark this webpage and check back regularly for the latest guidance.

Tropical Depression 15-E is expected to strengthen into a tropical storm named Nolo on Wednesday and possibly a hurricane by Thursday, which could bring heavy rains to Hawaiʻi Island and Maui this weekend.

At 5 a.m. Wednesday, the center of Tropical Depression 15-E was about 300 miles away from South Point on the Big Island and moving toward the west-northwest at 6 mph. Forecasters expect a sharp turn to the north and north-northeast on Thursday. That would bring the storm systems to Hawaiʻi Island on Friday or Saturday.

Rainfall is of particular concern, with 15 to 20 inches forecast across Hawaiʻi Island, with some parts getting as much as 35 inches of rain. Officials at the National Hurricane Center urged residents that now is the time to prepare for flooding.

On Wednesday morning, the National Weather Service issued a Flood Watch for Hawaiʻi Island through Saturday. Hawaiʻi County Civil Defense urged residents in flood-prone areas and those that recently experienced flooding to consider relocating away from impact areas before heavy rains start.

The Hawaiʻi County Department of Water Supply advised the public to prepare as electrical power disruptions may interrupt water service.

"Customers are encouraged to store an emergency supply of drinking water and conserve DWS water beginning now," the Hawaiʻi County Department of Water Supply said in a release. "Tap water should be used only for essential needs, such as drinking, cooking and personal hygiene, until weather conditions improve. Conserving drinking water helps maintain adequate storage in DWS tanks for essential needs and emergency fire protection."

With the storm on its way, the food pantry at Hilo's Grace Baptist Church, which is operated in partnership with the Food Basket, Hawaiʻi Island's Food Bank, is canceled for Thursday, Sept. 24. The event is rescheduled for Thursday, Oct. 1. For more information, contact (808) 959-9524 or (808) 959-3153.

Use these resources to stay informed on the storm’s progression:

Additional resources from HPR: 

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