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

Dotted Dark Blue Curve

Estimated Maximum Height Reached by Waves Along the Shore at Waikiki 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 Waikiki for the next 6 days, relative to MLLW.

Red Line at Top

If the Forecast Height Expected for the Highest Waves exceeds this line, it is likely that the entire width of the beach will be periodically swept by waves at many locations along Waikiki.

Solid Dark Blue Curve

Observed Sea Level in the neighborhood of Honolulu Hbr. for the previous 3 days. The sea level measurement, relative to MLLW, is representative of the slowly changing sea level (that is, ignoring the short period wind and swell waves) within five miles of Honolulu Hbr.

Solid Cyan Curve

Forecast Sea Level in the neighborhood of Honolulu Hbr. for the next 6 days. This sea level forecast is applicable for the slowly changing sea level (that is, ignoring short period wind and swell waves) within five miles of Honolulu Hbr. The forecast is relative to MLLW, and includes tides plus other weaker phenomena, but not wind/swell wave effects outside of Honolulu Hbr.