Final answer:
When temperatures drop sharply during a thunderstorm, it is likely due to the process of evaporation and condensation, as warm, moist air rises and releases energy in the form of heat. This rapid cooling can cause the temperatures to drop. The formation of ice or hail within the thunderstorm can also contribute to the cooling effect.
Step-by-step explanation:
When a thunderstorm is occurring and temperatures are dropping sharply, it is likely due to the process of evaporation and condensation. As warm, moist air rises and condenses, it releases energy in the form of heat, which can cause the surrounding air to cool rapidly. This rapid cooling can lead to a drop in temperatures. Additionally, the formation of ice or hail within the thunderstorm can further contribute to the cooling effect.