West Maui : Honolua Region, Maui

ForecastMapRun-up ExamplesArchive

Attention: The forecast is not accurate when a tsunami, tropical storm or cyclone watch/warning is in effect. For these events, please seek information for either tsunamis or tropical storms/hurricanes. In case of a possible inundation event, please consult with local authorities and emergency responders to seek further information and direction.

One or more of the following threshold levels is/are shown in the red shaded area in the plot below:
(a) Light Impacts, (b) Hazardous Impacts, (c) Critical Impacts. To better understand their definitions, please check out the Run-up Examples.

wave run-up forecast graphic for Honolua Region

The Solid Dark Blue Curve and Solid Cyan Curve display the Past and Forecast Sea Level for the previous 3 days and the next 6 days, respectively, relative to Mean Lower Low Water (MLLW, a typical NOAA datum). Past Sea Level is obtained from a combination of a local tide model with the long-period, non-tidal sea level variability being observed in real-time at Kahului Harbor. Grey vertical lines provide the associated times of high tides.

The Hatched Cyan Curve shows the forecast maximum height (or, run-up height) reached by waves along the shoreline in the Honolua region for the next 6 days, relative to MLLW. The run-up height will always exceed or equal the tide plus background sea level described above, because the waves are riding on top of that sea level. The Hatched Dark Blue Curve shows a history of the last forecast run-up height determined for each particular time of the past 3 days; this curve provides context to show how the forecast run-up for the next 6 days differs. For more information on how the forecasts are produced, see the Details tab on the Overview Page.

If the forecast run-up extends into the red shaded region on the plot, the waves are expected to at least become a disruption for beach activities. The higher the forecast the more severe the expected effects. Click on the Run-up Examples tab for descriptions of the possible hazards.


If you would like to receive notifications when the forecast for Honolua (or any other West Maui region) reaches the impact stage, please register here:

The Honolua region reaches from Honolua Bay to Hawea Point (just west of Oneloa Beach). The region is lightly developed and transitions at Kapalua to resort development that is setback from the shoreline. The shoreline is characterized by steep volcanic headlands containing a series of pocket beaches composed of sand or cobble. Intermittent, narrow fringing reef provides little protection from waves. Minimal infrastructure is threatened by high wave activity in this region.

Run-up Thresholds

(a) Light Impact – beach activities disrupted as occasional waves may sweep the beach slopes or intermittently reach vegetation.

(b) Hazardous Impact – heavy wave action on beaches; likely strong run-up to the vegetation and bluffs backing the beaches; and/or possible erosion of vegetation and bluffs in vulnerable locations.

(c) Critical Impact – waves battering vegetation and bluffs backing the beaches; likely flooding of adjacent land along stream channels behind several beaches; and/or significant erosion of exposed bluffs or volcanic sediment.

Run-up Examples

(a) Light Impact Event — May 16, 2020 | Honolua Region

Light Impact Honolua

DT Fleming Beach Park (Honokahua Bay). (blue star on map) Photo Credit: Louise Rockett.

Light Impact Honolua

DT Fleming Beach Park (Honokahua Bay). (blue star on map) Photo Credit: Louise Rockett.

Light Impact Honolua

DT Fleming Beach Park (Honokahua Bay). (blue star on map) Photo Credit: Heidi Sherman.

Light Impact Honolua

Slaughterhouse Beach (Mokuleia Bay). (orange star on map) Photo Credit: Heidi Sherman.

Light Impact Map Honolua

Get Involved!

We continue to collect photo documentation to fine-tune the model (if necessary) and to identify the impacts of these run-up events along the West Maui shoreline. We are specifically interested in photos around peak tides or swells, or anytime waves overtop beach features. If possible, capture the maximum extent of water running up the shoreline. The contributions from you, our citizen scientists, greatly contribute to establishing accurate thresholds for the model. Mahalo for your support!

Please submit your photos at:

To view photo submissions, please check out:

An archive of previous forecast plots can be accessed below. Select a day of interest from the calendar, or use the slider tool to quickly navigate through all available images. Two historical forecast plots are provided for each day, generated at 6:00 AM and 6:00 PM of the local time zone. To view the most recent forecast and to learn more about the different components of the graph, please go to the Forecast tab.

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