The lunar month’s highest tide occurred between 14th and 20th November 2020 for Waitemata harbour and Great Barrier Island.
The Waitemata harbour tidal gauge measured a mean level of 1.74 metres between 10:30am and 10:45am on 18th November which is 5cm above the November average (2015-2019). The barometric air pressure at the time of the reading was 1010.1 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.71 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 slightly upward. The tidal gauge data used for this analysis can be found here.
The Great Barrier Island tidal gauge measured a mean level of 1.20 metres between 10:00am and 10:15am on 18th November. The air pressure at the time of the reading was 1011.8 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.19 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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