Tidal predictions, highest and lowest levels, and other related information can be found here.
Tidal predictions for the next 28 days are available for locations in the UK & Ireland, together with the highest and lowest predicted tides from 2008 to 2026, and harmonic constants at each port – Read more →
Predictions spanning one year for the South Atlantic and Antarctica, British Overseas Territories, and the Gibraltar sea level station are available for download – Read more →
The alternating rise and fall of the sea surface are due mainly to the gravitational attraction of the moon and sun on the rotating earth – Read more →
Many people have asked us about the tides; here are answers to a selection of their questions – Read more →
In most tidal rivers the change from ebb to flood is gradual: the ebb current downstream slows, there is a period of slack water, then slowly the flood tide starts flowing upstream. In a few rivers, the behaviour is remarkably different and the onset of the flood tide is marked by a distinct, sometimes very vigorous wave – a bore – Read more →