Certain winds are a type of wind that blow from a particular direction. The term 'certain winds' can refer to two different types of winds: oboes and westerlies. Oboes are a type of wind that blow from the east, while westerlies are a type of wind that blow from the west. Westerlies are also known as the prevailing westerlies, which are the prevailing winds in the middle latitudes between 30 and 60 degrees latitude.