weather news•Wed, September 23, 2026•4 min read

Flood Watch Issued for Maui and Hawaii Counties as Tropical System Develops

The National Weather Service has issued a flood watch for Maui and Hawaii counties as a developing tropical disturbance nears the islands. Residents should prepare for heavy rain and potential flash flooding starting Wednesday afternoon through the weekend.

Developing System Prompts Alert for Hawaii

Residents in Maui and Hawaii counties are being urged to prepare as the National Weather Service (NWS) has officially issued a flood watch for the region. The alert comes in response to a developing tropical disturbance, currently referred to as Tropical Disturbance 15E, which is moving toward the islands from the southeast.

Meteorologists expect the system to bring significant rainfall to the state beginning Wednesday afternoon. The threat is expected to persist through Saturday afternoon, with windward and southeast areas of the Big Island and windward Maui identified as the most vulnerable locations.

Weather officials are closely monitoring a disturbance southeast of the Big Island.

What to Expect and How to Prepare

The system, which has the potential to intensify into a tropical depression or storm—currently being tracked by meteorologists as a potential cyclone dubbed 'Nolo'—poses a significant flash flooding risk. Because weather conditions can change rapidly, local authorities are emphasizing the importance of immediate preparation.

Monitor local weather reports and NOAA radio for the latest updates on the storm's path and intensity.
Clear drainage areas around your property to help manage heavy runoff.
Follow guidance from local officials regarding any potential evacuation orders or shelter-in-place recommendations.
Never attempt to drive, walk, or swim through flooded roadways; remember the mantra: 'Turn Around! Don’t Drown!'
Secure loose outdoor items that could become hazards in high winds.

When a hurricane or tropical storm strikes, the Red Cross provides shelter, food and comfort. Determine your best protection from high winds and flooding. Have a plan to evacuate and a plan to shelter safely.
— American Red Cross

Key Takeaways

A flood watch is in effect for Maui and Hawaii counties from Wednesday afternoon through Saturday afternoon.
The weather event is driven by a developing tropical disturbance southeast of the Big Island.
Windward and southeast regions of the affected counties are at the highest risk for heavy rainfall.
The system could potentially intensify into a tropical depression or storm named 'Nolo'.
Residents should stay informed via official channels and avoid traveling through floodwaters.

FAQ

What is the difference between a flood watch and a warning?

A flood watch means that conditions are favorable for flooding to occur. You should stay alert and prepare to take action. A warning means flooding is occurring or imminent and requires immediate action.

When should I expect the heaviest rainfall?

Heavy rain is expected to develop starting Wednesday afternoon, with potential impacts lasting through the weekend.

What should I do if I encounter a flooded road?

Never attempt to drive or walk through floodwater. Turn around and find an alternate, safer route.

How can I stay updated on this storm?

Monitor official bulletins from the National Weather Service, listen to NOAA Weather Radio, and check updates from local news organizations.