Abnormally high tides combined with an approaching low‑pressure system may lead to minor to moderate coastal flooding this weekend.
Elevated water levels, strong winds, and increased wave action are expected to rise above the highest astronomical tides, heightening the risk of coastal impacts.
What: Coastal flooding is possible due to storm surge occurring at the same time as high tides.
When: This weekend, with the highest risk on Sunday.
Additional details: The South Coast is entering a period of very high astronomical tides as Earth reaches perihelion—its closest point to the Sun. At the same time, a low‑pressure system is forecast to move across the region. The associated drop in atmospheric pressure may push water levels even higher than predicted, increasing the potential for coastal flooding.
The exact path and timing of the low‑pressure centre remain uncertain, and wind strength will depend on its eventual track.
Moderate winds and storm surge may push debris ashore and contribute to coastal erosion. Minor to moderate flooding is expected along exposed or low‑lying shorelines, with the possibility of more significant localized flooding where onshore winds align with peak tides. Coastal roads and walkways may become difficult to navigate due to flooding and debris such as driftwood and rocks.
Example of how storm surge works
