The interior Chinooks are occasional warm, dry föhn winds blowing down the eastern sides of interior mountain ranges. The coastal Chinooks are persistent seasonal, wet, southwesterly winds blowing in from the ocean. For the casino, see Chinook Winds Casino.Ĭhinook winds, or simply Chinooks, are two types of prevailing warm, generally westerly winds in western North America: Coastal Chinooks and interior Chinooks.