How to draw the wind direction in geography

1. High-altitude wind: first draw the horizontal pressure gradient force, perpendicular to the isobar, and point from high pressure to low pressure. Then draw the wind direction, and the northern hemisphere deflects 90 degrees to the right, parallel to the isobar; The southern hemisphere deflects 90 degrees to the left, parallel to the isobar. As shown in the figure:

2. Near-surface wind: first draw the horizontal pressure gradient force, perpendicular to the isobar, and point from high pressure to low pressure. Then draw the wind direction, the northern hemisphere deflects about 40 degrees to the right, and the isobar is oblique; The southern hemisphere deflects 40 degrees to the left, oblique to the isobar. As shown in the figure:

Extended data:

Indication of wind direction:

1, symbol:

Wind direction refers to the direction of the wind. The unit of measurement of wind direction, expressed in azimuth.

In the forecast of the Central Meteorological Observatory, there are symbols on the big screen: it looks like an F, in which the "tail" (vertical downward) indicates the wind direction; "Fugan" (horizontal line on the right) indicates the magnitude of wind power, and Fugan is directly proportional to wind power.

2. Judgment method:

(1) is judged by the distribution map of sea level isobar. For example, in the distribution map of sea level isobar in the northern hemisphere, A is the center of high pressure and B is the center of low pressure. According to the definition of wind direction, then ① northwest wind prevails, ② southwest wind prevails.

(2) According to the cyclone and anticyclone diagram. For example:

For example, the schematic diagram of the cyclone in the northern hemisphere on the right, pay attention to where the cyclone is when judging the wind direction. Generally, a cyclone blows westerly winds in the south and easterly winds in the north; The north wind blows on the west side of the cyclone and the south wind blows on the east side of the cyclone.

(3) According to the relationship between boiling point and air pressure.

(4) Judging from the characteristics of monsoon climate.

China mainly blows northerly winds in winter; The south wind blows mainly in summer. In winter in South Asia, the northeast wind blows; In summer, the southwest wind blows.

(5) Judging from temperate maritime climate and Mediterranean climate.

According to the climate characteristics, the temperate maritime climate blows west wind all the year round, southwest wind blows in the northern hemisphere and northwest wind blows in the southern hemisphere. The climate of the Mediterranean is westerly in winter.

(6) The wind in the sky is parallel to the isobar.

Baidu encyclopedia-wind direction

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