The National Tidal and Sea Level Facility (NTSLF) is the UK’s centre of excellence for sea level monitoring, coastal flood forecasting, and the analysis of sea level extremes. It is the focus for sea level research and for its interpretation into advice for policy makers, planners and coastal engineers.

Tides and storm surges

Tides are the predictable rise and fall of the sea surface as the Earth rotates while the moon’s gravity, as well as the sun’s, pulls on the oceans.

Read about tides

Storm surges are caused by the weather, especially low pressure systems (inverse barometer effect), strong winds and the Earth’s rotation (forcing water towards the coast). Surges are in addition to tides, and computer models can forecast their combined levels alongside weather forecasts.

Read about surges

Interactive map of tide gauge networks

Find tide gauge measurements, tidal predictions and storm surge forecasts. Click the markers for a summary of information for each site.
Map: UK Tide Gauge Network | South Atlantic Network

Latest news

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Please send letters to: NTSLF, National Oceanography Centre, 6 Brownlow Street, Liverpool L3 5DA or webmaster@noc.ac.uk