This map is a schematic diagram of the ground weather in a certain area at a certain time. Read the picture and answer questions 2 ~ 3. 2. The wind direction of M in the picture is (). 3. Weather that

This map is a schematic diagram of the ground weather in a certain area at a certain time. Read the picture and answer questions 2 ~ 3. 2. The wind direction of M in the picture is (). 3. Weather that produces precipitation in the illustrated area. According to the numerical change of isobar in the figure, the precipitation area is located near the trough of low pressure. Find a point in the most curved protruding part of each isobar near the precipitation area, and connect the points with dotted lines. This point is the position of the trough of low pressure, and this position is the position where the front is formed. It can be seen from the dense isobar in the precipitation area and close to the anticyclone center that the cold air mass is strong and the formed front is a cold front.