Final answer:
The correct news headline for the upcoming weather conditions described by the meteorologist, including dropping temperatures, heavy snow, and high winds, is 'A Strong Cold Front Threatens the Region'.
Step-by-step explanation:
Based on the weather forecast provided by the meteorologist, which predicts plummeting temperatures, the presence of heavy snow, and high winds, the news headline that best accounts for the change in weather is 'A Strong Cold Front Threatens the Region'. This headline accurately represents the incoming weather conditions described, such as temperatures dropping below freezing and the possibility of heavy snowfall, which are characteristic effects of a strong cold front moving into an area. The other options either do not correspond with the described weather conditions (a warm front or a warm air mass) or suggest an opposite weather pattern (a cold air mass exiting the region).