Explanation:

They originate from the high-pressure areas in the horse latitudes and tend towards the poles and steer extra-tropical cyclones in this general manner.
? The westerlies are strongest in the winter hemisphere and times when the pressure is lower over the poles, while they are weakest in the summer hemisphere and when pressures are higher over the poles.
? Tropical cyclones which cross the subtropical ridge axis into the Westerlies recurve due to the increased westerly flow.
? The westerlies are particularly strong, especially in the Southern Hemisphere, in areas where land is absent, because land amplifies the flow pattern, making the current more north-south oriented, slowing the westerlies.
? The strongest westerly winds in the middle latitudes can come in the roaring forties, between 40 and 50 degrees latitude.