Option 1: Chinook winds do indeed rise from the Pacific Ocean. Due to the unique topography of the Rocky Mountains, these winds are forced upwards and over the mountain range.
Option 2: After crossing the Rockies, Chinook winds descend to the east of the mountains. As the winds move over the mountains, they cool and release moisture, resulting in drier air on the eastern side.
Option 3: This statement is not correct. Chinook winds do not bring rainfall in the Prairies. In fact, these winds are known for their warm and dry characteristics, often leading to rapid melting of snow and causing winter temperatures to rise.
Option 4: Chinook winds are indeed beneficial to wheat cultivation. These winds help to melt snow and ice, allowing winter wheat crops to sprout earlier in the year. Additionally, the warm and dry nature of Chinook winds can help reduce disease and pest pressure on wheat fields.
In conclusion, the statement that is not correct regarding Chinook winds is option 3, as these winds do not bring rainfall in the Prairies.