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

Caution: The forecast below is experimental and no promise of accuracy is implied; especially, the forecast is explicitly not accurate when either a tsunami, tropical storm or hurricane warning is in effect. In these latter cases, see either tsunamis or tropical storms/hurricanes.

SLpred graphic for Waikiki

Description

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.

Additional Information

Click here for additional information about both the plotted variables and forecast accuracy.

The Wave Run-Up Forecast Tool was developed by M. Guiles, D. Luther and M. Merrifield, and is maintained by M. Guiles.



beach flooding waikiki

Photo of Very High Wave Run-Up in front of Sheraton Surfrider Hotel, the afternoon of July 22, 2009 (courtesy of Chris Conger, University of Hawaii Sea Grant Program)

Please consider acknowledging PacIOOS in any distribution or publication of data as follows: Data provided by PacIOOS (www.pacioos.org), which is a part of the U.S. Integrated Ocean Observing System (IOOS®), funded in part by National Oceanic and Atmospheric Administration (NOAA) Award #NA11NOS0120039.