A southwest, to Northeast movement of air. A drop in air pressure. And warm air behind the front.
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Answer:
when it gets high pressure
It's A. I don't know why, but I got it right, so
The air behind the front is cooler than the air it is replacing and the warm air is forced to rise, so it cools. As the cooler air cannot hold as much moisture as warm air, clouds form and rain occurs.
