wind change

Recollecting our former escape, we could not help fearing that, should the wind change, we might meet with a similar accident.

He had no compass, and even should the wind change, he would have difficulty in regaining so small a spot.

At last, on the fifth day, we had the pleasure of seeing the sky clear up and the wind change.

At any moment, however, should the wind change, they might be carried in their direction.