The Sea Alert and Warning is the technique to produce alert and warning of water levels from coinciding high and low astronomical tide and high mean sea level anomaly is demonstrated for the Pacific Islands region. Low lying coastal margins are vulnerable to episodic inundation that often coincides with times of higher-than-normal high tides. Prior knowledge of the dates of the highest tides can assist with efforts to minimize the impacts of increased exposure to inundation. It is shown that the climate-driven mean sea level anomaly is an important component of total sea level elevation in the Pacific Islands region, which should be accounted for in medium-term sea level forecasts. An empirical technique is applied to develop a mean sea level adjusted high water alert calendar that accounts for both sea level components and provides a practical tool to assist with coastal inundation hazard planning and management.

A warning is issued when dangerous conditions are imminent or occurring. If you are in at sea, take immediate action to protect yourself and your boat. Watch and be Prepared for a information of when the conditions are favorable for a specific hazardous weather event to occur.

high waters combine with large waves or storm surges there is an increased chance of flooding or coastal erosion. The predicted high-waters include the height of tide mean sea level and the storm surge that is included to the forecasts.

The calendars are updated monthly and the first other months includes the forecasts built using a statistical model incorporating forecasts from a dynamical coupled ocean-atmosphere model to see the state of the time to the forecast was made.

For each location there are two types of calendar that provided the alert days for the next months, and a calendar for each month with details of high and low tides for each day and a plot of forecast sea level with time. The shading of Alert and Warning shows the all high and low waters, the red shading, orange shading and yellow shading.