Severe Flood ● Closed
Flood Watch issued September 23 at 3:44AM HST until September 26 at 6:00PM 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.
An intensifying tropical cyclone is expected to bring heavy rain to
the eastern end of the state over the next few days. The exact track
of the dangerous tropical cyclone remains somewhat uncertain, but
significant heavy rain is likely over windward and southeast Big
Island.
* WHAT...Flash flooding caused by excessive rainfall continues to be
possible.
* WHERE...Big Island, Maui, Lanai, Molokai, and Kahoolawe.
* WHEN...From noon HST today through Saturday afternoon.
* IMPACTS...Significant flooding may occur due to the overflow of
streams and drainages. Roads in several areas may be closed, along
with property damage in urban or low lying spots due to runoff.
Landslides may also occur in areas with steep terrain.
* ADDITIONAL DETAILS...
- Heavy rain on the north side of an intensifying tropical cyclone
will develop later today and tonight over Big Island and spread
to Maui. Windward and southeast Big Island and windward Maui are
the most likely to experience heavy rain, with considerable
flooding possible over portions of Big Island Friday into the
weekend. Other islands in Maui County are at risk as well.
Measurements
| Coordinates | 39.9645, -100.8105 |
|---|---|
| Region | Lanai Mauka; Kahoolawe; Maui Windward West; Maui Leeward West; Haleakala Summit; Kona; Kohala; Big Island Interior; Big Island Summit; Molokai Windward; Mo |
| Location Precision | country |
| Issuing Authority | United States of America — us-noaa-nws-en |
| Cap Urgency | Future |
| Cap Certainty | Possible |
| Cap Expires | 2026-09-23T17:45:00-10:00 |
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 26 days ago (Sep 23, 2026 13:46 UTC) · we last heard from WMO Alert Hub (national weather services) 56 seconds ago
On a slow connection? Low-bandwidth version — no map, no scripts, under 14 KB.
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: Lanai Mauka; Kahoolawe; Maui Windward West; Maui Leeward West; Haleakala Summit; Kona; Kohala; Big Island Interior; Big Island Summit; Molokai Windward; Mo
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.