Severe · Flood WatchActive alert

Flood Watch issued September 17 at 5:40PM HST until September 18 at

Affecting Niihau; Kauai Southwest; Kauai Mountains; Waianae Coast; Oahu North Shore; Olomana; Central Oahu; Waianae Mountains; Kauai North; Kauai East; Kauai South; East Honolulu; Honolulu Metro; Ewa Plain; Koolau Windward; Koolau Leeward

In effect until: Sep 18, 2026, 4:00 PM

Niihau; Kauai Southwest; Kauai Mountains; Waianae Coast; Oahu North Shore; Olomana; Central Oahu; Waianae Mountains; Kauai North; Kauai East; Kauai South; East Honolulu; Honolulu Metro; Ewa Plain; Koolau Windward; Koolau Leeward

Possible impact zone; conditions develop through 4:00 PM.

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

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Read the original bulletin (official text)

Remnant moisture from former Tropical Storm Norbert will bring
periods of moderate to heavy showers to mainly windward sides of the
Hawaiian Islands through late tonight.

* WHAT...Flash flooding caused by excessive rainfall continues to be
possible.

* WHERE...Kauai, Niihau and Oahu.

* WHEN...Through late tonight.

* IMPACTS...Flood prone roads and other low lying areas may be closed
due to elevated runoff and overflowing streams. Urban areas may
receive more significant flooding and property damage due to rapid
runoff.

* ADDITIONAL DETAILS...
- A band of remnant moisture from Norbert will move west across the
islands through Friday, bringing moderate to locally heavy
showers to mainly windward sides of the islands. There is a
slight chance of thunderstorms as well, which could produce
briefly higher rain rates, increasing the risk of flash flooding.

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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™

Flood Watch issued September 17 at 5:40PM HST until September 18 at

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