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Monthly sea level peak for January 2022

The lunar month’s highest tide occurred on 5th January for Waitemata harbour and 4th January for Great Barrier Island.


The Waitemata harbour tidal gauge measured a mean level of 1.64 metres between 10:00am and 10:15am on 5th January which is 9cm below the January average (2015-2021). The barometric air pressure at the time of the reading was 1011.3 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.66 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 1.23 metres between 09:00am and 09:15am on 4th January. The air pressure at the time of the reading was 1012.4 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.24 metres at the mean sea level pressure of 1013 hPa. More on meteorological effects on tides can be found here.


Note# A non tidal 1.33m tsunami event occurred on 16 January from a major volcanic eruption in Tonga. The tsunami fortunately occurred on peak low tide.


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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