Forecast of the Potential for High Sea Level and Wave Run-Up at North Shore, O‘ahu

Dotted Dark Blue Curve

Estimated Estimated Maximum Height Reached by Waves Along the Shore at Rock Piles (northeast of Waimea Bay) for the previous 3 days, relative to MLLW (Mean Low Low Water), a well-defined reference level (NOAA datum description).

Dotted Cyan Curve

Forecast Height for the Highest Waves Along the Shore at Rock Piles for the next 6 days, relative to MLLW. If the forecast exceeds ten feet it is likely that there will be periodic overtopping of the roadways nearby. If the forecast exceeds eight feet, overtopping of lower roadways closer to the shore (such as at Laniakea Beach and Dillingham Airfield) has been observed.

Solid Dark Blue Curve

Sea Level Due to Tides in the neighborhood of Haleiwa Hbr. for the previous 3 days. This tidal sea level variation, relative to MLLW, is representative of the slowly changing sea level (that is, ignoring short period wind and swell waves) within 5-8 miles of Haleiwa Hbr.

Solid Cyan Curve

Forecast Tidal Sea Level in the neighborhood of Haleiwa Hbr. for the next 6 days. This tidal sea level forecast, relative to MLLW, captures most of the slowly changing sea level (that is, ignoring short period wind and swell waves) within 5-8 miles of Haleiwa Hbr. The forecast is updated every 4 hrs.