At Time 1, a cool air mass is moving from Location 1 toward a stationary warm air mass at Location 2. After the cool air mass collides with the warm air mass at Time 2, clouds begin to appear over Location 2. The partial model below shows the two air masses at Time 1 but does not show their interaction at Time 2. Identify what happened at Time 2 when the cool air mass collided with the warm air mass at Location 2 and clouds formed.