The lunar month’s highest tide occurred between 13th and 19th December 2020 for Waitemata harbour and Great Barrier Island.
The Waitemata harbour tidal gauge measured a mean level of 1.60 metres between 09:00am and 09:15am on 16th December which is 5cm below the December average (2015-2019). The barometric air pressure at the time of the reading was 1023.3 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.70 metres at the mean sea level pressure of 1013 hPa. More on meteorological effects on tides can be found here.
The ongoing trend between 2014 to 2020 for the Waitemata harbour sea level peak is flat. The tidal gauge data used for this analysis can be found here.
The Great Barrier Island tidal gauge measured a mean level of 1.07 metres between 09:45am and 10:00am on 17th December. The air pressure at the time of the reading was 1019.6 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.13 metres at the mean sea level pressure of 1013 hPa. More on meteorological effects on tides can be found here.
The ongoing trend between 2014 to 2020 for Great Barrier Island sea level peak is an upward trend. The tidal gauge data used for this analysis can be found here.
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