It would cause unpredictable currents, they said.

Crossing times are largely determined by the strong and sometimes unpredictable currents that operate in the strait.

However, due to the estuary there are unpredictable currents at this end of the beach.

The narrow channels of the straits and the unpredictable currents, tides, and winds were constant hazards, especially to sailing vessels; steam-powered vessels had an easier passage.

The legend told of a large monster that lived in the lake, and as it moved it would create dangerous and unpredictable currents, which could easily capsize a canoe.