How to distinguish between cold and warm fronts and how will the weather change before and after crossing the border?

The cold front is that the cold air mass pushes towards the warm air mass, and it cools down, so the arc of the front surface protrudes upward.

Is the warm front pushed by the warm air mass to the cold air mass or dropped by the cold air mass? In the process of marching, the warm air mass pushes the cold air mass back step by step, so the arc on the front surface protrudes downward.

So sometimes you can judge by the shape of the front, but usually the front has a direction, which is easier.

2? When recognizing latitude

This is relatively easy. According to the definition of cold and warm front, pushing to low latitude is a cold front, and vice versa.

Cold front? warm front

Before crossing the border? Sunny？ The temperature is high, is there enough sunshine? low temperature

During the transit period, rain and snow continued to rain.

The temperature dropped after crossing the border? Air pressure rises? The weather is fine and the temperature is rising? Pressure drop? Clear and cloudless