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Monthly sea level peak for April 2021

The lunar month’s highest tide occurred on 1st April 2021 for Waitemata harbour and Great Barrier Island.

The Waitemata harbour tidal gauge measured a mean level of 1.69 metres between 11:15am and 11:30am on 1st April which is 1cm above the April average (2015-2020). The barometric air pressure at the time of the reading was 1008.8 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.73 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 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 1.12 metres between 10:15am and 10:30am on 1st April. The air pressure at the time of the reading was 1010.2 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.15 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 a flat trend. The tidal gauge data used for this analysis can be found here.




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