Which statement best describes jet streams?

• A. They influence only winter weather
• B. They can bring changes in weather patterns, including storms and temperature shifts
• C. They cause droughts worldwide
• D. They have no impact on weather

Answer: (B)

Jet streams are fast, high-altitude air currents that steer weather systems. Because they guide the tracks of low-pressure systems and the movement of cold and warm air masses, their position and strength can cause notable changes in weather patterns across regions. This means you can see storms, temperature swings, and shifts in precipitation as the jet stream shifts or undulates. They influence weather in all seasons, not just winter, and their impact is to modify how weather unfolds rather than having no effect or causing droughts everywhere. That’s why this description—bringing changes in weather patterns, including storms and temperature shifts—best captures what jet streams do.