Atmospheric analysis

The wave heights produced by this model are based on significant wave height calculated over a 20-minute sample. The maximum wave height for that same period will be markedly higher than what is shown.
The accuracy of the simulated wave heights depends on the validity of the assumptions made about deep-water wave conditions and the local wind speed and direction. At any given location, the local wind speed and direction in particular may not be accurately represented.

Port Taranaki sea levels

Timaru sea level

Pouto Point sea levels

Moturiki Island sea levels

Lyttelton sea levels

Little Kaiteriteri sea levels

Jackson Bay sea levels

Data source – NIWA
Latest data The upper plot compares raw data (blue) and forecast tide (red). When the two curves are aligned there is no storm surge, which is the elevation or depression of sea level as a result of meteorological conditions. But if the raw data lie above or below the forecast tide, it means we have positive or negative storm surge. The lower plot compares storm surge (SS) with inverted barometer (IB), which is derived from atmospheric pressure. When the two curves are aligned it means that the storm surge is being driven by local pressure changes.