The statement in option 3, "They bring lots of rain with them," is not correct. Chinook winds are warm, dry winds that occur on the eastern slopes of the Rocky Mountains in mid-latitudes. They are not associated with bringing lots of rain.

Option 1 states that Chinook winds are local winds, which is correct. Local winds are winds that occur on a small scale and are influenced by local geographic features.

Option 2 correctly states that Chinook winds descend along the eastern slopes of the Rocky Mountains in mid-latitudes. As the winds move down the mountain slopes, they can warm up and lose moisture, resulting in dry and warm conditions in the areas they affect.

Option 4 correctly states that Chinook winds benefit agriculture. Due to their warm and dry nature, Chinook winds can help melt snow quickly, allowing farmers to start planting earlier in the growing season. They can also prevent frost damage to crops.

In summary, the only incorrect statement is that Chinook winds bring lots of rain. They are warm, dry winds that benefit agriculture by melting snow and preventing frost damage.