Superlow tide

1.45pm and the tide has ebbed to 0.0 metres above chart datum. Sun and moon have combined to cause a superlow tide. Just over 6 hours later, the springtide rose to 5.4 metres (18 feet) above chart datum. The ferries Isle of Lewis and Loch Seaforth (right) do have sufficient water under their keels, in spite of the seaweed in the foreground.