The author stated that during summer, in neap tides, the stream flows from the Atlantic into the Minch all day, but from the Minch into the Atlantic all night. In winter this was reversed, the stream flowing through the Sound of Harris from the Minch into the Atlantic all day, but from the Atlantic into the Minch all night.

In spring tides, both during summer and winter, the stream comes in from the Atlantic during the greater part of the time the water is rising, and flows back into the Atlantic during the greater portion of the fall of the tide.