Frontal is one of the most important weather systems in the world, and it is most common in mid-latitude areas. Read the chart data and complete the related questions. Shanghai 2013165438+1from Octobe

Frontal is one of the most important weather systems in the world, and it is most common in mid-latitude areas. Read the chart data and complete the related questions. Shanghai 2013165438+1from October 23rd to October 23rd. (1) Definition: It is a cold front that cold air actively moves to warm air; A warm front in which warm air actively moves towards cold air.

Frontal slope: the cold air mass moves fast, so the cold air mass in the cold front pushes the front to move fast, and the warm air mass rises fast, so the cold front slope is large; In the warm front, the warm air mass slowly climbs above the cold air mass, pushing the front to move slowly, so the slope of the warm front is small.

Location of frontal rain belt: the cold front rain area is mainly behind the front; The rain area of the warm front is mainly in front of the front (whether it is a warm front or a cold front, the rain area is mainly on the side of the cold air mass).

Frontal rain belt range: the cold front rain belt range is small; Warm front rain belt has a wide range.

(2) According to the weather changes in Shanghai in the table, it is not difficult to judge that this time is affected by the cold front weather system. Before the cold front crossed the border, the temperature was high, the air pressure was low and the weather was fine. There are often strong winds, rain, snow and cooling weather when crossing the border. After crossing the border, the temperature dropped, the air pressure rose and the weather turned fine.

So the answer is:

( 1)

Cold and warm fronts defined the front of cold air moving towards warm air. The front slope of warm air moving in the direction of cold air is large, and the position of front rain belt is small. (2) cold front; When crossing the border, it is windy and rainy; After crossing the border, the temperature dropped, the air pressure rose and the weather turned fine.