How to describe the weather
A. Affected by the cold front, the temperature will drop.
B. Affected by the warm front, the temperature will rise.
C. due to the cold front, the air pressure will decrease.
D. Affected by the warm front, the air pressure will increase.
Above (from left to right) is a warm air mass, and below (from right to left and then to right) is a cold air mass. In the picture, the cold air mass moves from right to left, and is forced to retreat after encountering the warm air mass, indicating that the warm air mass is strong and actively moves to the cold air mass (from left to right), forcing the cold air mass to retreat to the right. There is a warm front ahead, and the temperature will rise. So choose B. Affected by warm front, the temperature will rise.