Tell the weather

Rainbow is formed by the refraction and reflection of sunlight on water droplets in the air. It appears in the opposite direction to the sun. Because of the movement law of the weather system, it moves from west to east, and a rainbow appears in the west, indicating that the rain area in the west will move and it will rain locally. There is a rainbow in the east, which means the rain area is in the east. If it moves eastward, it will have no impact on the local area, and it will not rain in the future.