The lunar month’s highest tide occurred on 21st March for Waitemata harbour and 5th March for Great Barrier Island.
The Waitemata harbour tidal gauge measured a mean level of 1.63 metres between 10:00am and 10:15am on 21st March which is 2cm below the March average (2015-2021). The barometric air pressure at the time of the reading was 1005.7 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.55 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 2022 for the Waitemata harbour sea level peak is downward. The tidal gauge data used for this analysis can be found here.
The Great Barrier Island tidal gauge measured a mean level of 1.18 metres between 09:30am and 09:45am on 5th March. The air pressure at the time of the reading was 1024.1 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.29 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 2021 for Great Barrier Island sea level peak is slightly upward. The tidal gauge data used for this analysis can be found here.
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