The correct answer is option 1: Chinook. Chinook winds are warm winds that blow down the eastern slopes of the Rocky Mountains in North America. These winds are considered to be anti-trade winds because they flow opposite to the direction of the trade winds, which blow from east to west. The trade winds are the prevailing winds that blow towards the equator in both the northern and southern hemispheres. They are named so because they were historically used by traders sailing ships to travel between continents. Therefore, the Chinook winds, which blow in the opposite direction of the trade winds, are called anti-trade winds.