Final answer:
The weather changes in the scenario can be explained by the movement of air masses and changes in temperature and wind direction.
Step-by-step explanation:
The weather changes described in the scenario can be explained by the movement of air masses and the associated changes in temperature and wind direction. The slow, steady precipitation followed by warming and a shift in wind direction from easterly to southerly represents the arrival of a warm front. As the warm front passes, the skies clear, and a thunderstorm occurs, which suggests the presence of a cold front. The temperature drop and the shift in wind direction to westerly are consistent with the passage of a cold front.