Severe Flood ● Closed
Flood Watch issued September 16 at 3:41PM HST until September 18 at 6:00AM HST by NWS Honolulu HI, United States of America
Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.
Remnant moisture from former Tropical Storm Norbert will bring
periods of moderate to heavy showers to the Hawaiian Islands tonight
through Friday morning.
* WHAT...Flash flooding caused by excessive rainfall is possible.
* WHERE...Kauai, Niihau, Maui, Lanai, Molokai, The Big Island and
Kahoolawe.
* WHEN...Through early Friday morning.
* 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 east across the
islands tonight into Friday, bringing moderate to locally heavy
showers. There is a slight chance of thunderstorms on Thursday as
well, which could produce briefly higher rain rates, increasing
the risk of flash flooding.
Measurements
| Coordinates | 39.9645, -100.8105 |
|---|---|
| Region | Niihau; Kauai Southwest; Kauai Mountains; Waianae Coast; Oahu North Shore; Olomana; Central Oahu; Waianae Mountains; Lanai Mauka; Kahoolawe; Maui Windward |
| Location Precision | country |
| Issuing Authority | United States of America — us-noaa-nws-en |
| Cap Urgency | Future |
| Cap Certainty | Possible |
| Cap Expires | 2026-09-17T06:00:00-10:00 |
Official source
Warnings courtesy of the issuing national meteorological service, via the WMO Alert Hub.
This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.
Severity as published by WMO Alert Hub (national weather services).
View original reportThis event as JSON · API and licence
Source updated 32 days ago (Sep 17, 2026 01:42 UTC) · we last heard from WMO Alert Hub (national weather services) 23 seconds ago
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About this location
The agency did not publish coordinates for this warning. The pin is the centre of the country, not the location of the event — read the area name, not the map, for where it applies.
Area as the agency stated it: Niihau; Kauai Southwest; Kauai Mountains; Waianae Coast; Oahu North Shore; Olomana; Central Oahu; Waianae Mountains; Lanai Mauka; Kahoolawe; Maui Windward
Official authorities in United States
If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.
More for United States →What to do
Follow the instructions issued by WMO Alert Hub (national weather services) and your local emergency services. The guidance below is background.
Flood preparation, evacuation decisions, and the dangers of driving or walking through floodwater.
Open Flood Safety Guide →Earlier flood events in United States
Severe and extreme events of the same kind, before this one. Listed for scale, not because they are connected to it.
Nearby & related events
Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.