Final answer:
The most likely effect the jet stream will have on the weather of Des Moines is severe thunderstorms.
Step-by-step explanation:
The most likely effect the jet stream will have on the weather of Des Moines is D. Des Moines will most likely have severe thunderstorms. The jet stream is a fast-moving, narrow air current in the upper atmosphere that can greatly influence weather patterns. It can cause the formation of severe thunderstorms, as it brings together warm, moist air from the south and cool, dry air from the north, creating instability and triggering thunderstorm activity. This can result in heavy rain, lightning, strong winds, and even tornadoes.