The correct answer is option 3: a warm wind in North America.

Chinook is a specific type of wind that occurs in the western United States and Canada, particularly in the Rocky Mountains region. It is characterized by a warm and dry wind that blows down the eastern slopes of the mountains and can significantly raise temperatures in a short period of time.

Option 1, a cold wind in Europe, is incorrect. The Chinook wind is not a cold wind; instead, it brings warmth and causes temperatures to rise.

Option 2, a tropical desert storm in West Asia, is also incorrect. The Chinook wind is not associated with tropical desert storms and does not exist in West Asia.

Option 4, a depression in South Africa, is also incorrect. The Chinook wind is not a type of depression and is not found in South Africa.

In summary, the Chinook wind is a warm wind that occurs in North America, particularly in the Rocky Mountains region, bringing a sudden rise in temperature.