1. Use the sea level isobars distribution map to judge. For example, in the sea level isobars distribution map in the Northern Hemisphere, place A is the high pressure center and place B is the low pressure center, which are defined according to the wind direction.
2. Use the characteristics of monsoon climate to judge. In winter, northerly winds blow mainly in China; in summer, southerly winds blow mainly. In South Asia, northeasterly winds blow in winter; southwesterly winds blow in summer.
3. Use temperate maritime climate and Mediterranean climate to judge. According to the climate characteristics, the temperate maritime climate has westerly winds blowing all year round, southwesterly winds in the northern hemisphere, and northwesterly winds in the southern hemisphere. Mediterranean climate with westerly winds blowing in winter.
4. The wind at high altitude is parallel to the isobars.
Wind direction measurement
One of the instruments for measuring wind direction is the wind vane, which is generally 10-12 meters high from the ground. If there are obstacles nearby, its placement The height should be at least 6 meters higher than the obstacle, and the short stick pointing north should be facing north. The direction in which the wind direction arrow points indicates the direction of the wind blowing at that time. There is also a rectangular wind pressure plate on the wind detector (the heavy one weighs 800 grams, the light one weighs 200 grams). An arc-shaped frame is installed next to the wind pressure plate, and there are long and short teeth on the frame. The number of long and short teeth that the wind pressure plate raises indicates the strength of the wind.
Reference for the above content: Baidu Encyclopedia-Wind Direction