How to judge the direction of the wind, how to judge the direction of the wind

How to judge the direction of the wind.

Wind direction refers to the direction of the wind, the weather vane of the meteorological station.

That is, pointing to the direction of the wind. The interpretation of the wind frequency map needs to grasp the principle of its drawing: the probability of wind frequency at the central origin is zero, and the farther away from the central origin, the higher the probability of wind frequency. The point of the point towards the central origin, that is, the direction of the wind in that direction.

Interpret from geographical location.

Due to the atmospheric circulation.

Six wind bands have been formed around the world, so in a typical geographical location, the wind direction should be regular. For example, East Asia - southeast wind blows in summer.

Northwest winds blow in winter; South Asia - southwest winds in summer and northeast winds in winter; Western Europe - in the westerly wind belt all year round.

Middle. How to draw the direction of the wind in geography.

1. Wind at high altitude: first draw the horizontal pressure gradient force, perpendicular to the isobar, from high pressure to low pressure. Then draw the wind direction, the Northern Hemisphere.

Deflect 90 degrees to the right, parallel to the isobar; The Southern Hemisphere is deflected 90 degrees to the left, parallel to the isobar.

2. Wind near the ground: 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, diagonally crossing the isobar; The southern hemisphere deflects 40 degrees to the left and crosses the isobar diagonally.

The direction in which the wind comes out is the direction of the wind, and generally we feel the direction of the wind, and the direction in which the wind blows from the south is the south wind, and the direction from the north is the north wind.

How to judge the direction of the wind?

When we are outdoors, we can judge the direction of the wind according to the branches and flags and other similar things, when conditions permit, what direction the wind is blowing.

How to judge the direction of the wind?

When the flag is flying in the direction of the south, it proves that the wind is blowing from the north, and the wind direction at that time is the north wind.

How to judge the direction of the wind?

If the flag is blowing in the northwest direction when it is blowing with the wind, it proves that the wind is coming from the southeast, then it is blowing in the southeast wind at that time.

How to judge the direction of the wind?

end to conclude.

1.The wind blowing from the south is the south wind, and the direction blowing from the north is the north wind.

2.According to the direction in which the flag is blowing with the wind to the south, it proves that the wind is blowing from the north, then the wind direction is the north wind.

3.The flag is blowing in the northwest direction, which proves that the wind is coming from the southeast direction.

Make your own weather vane and easily judge the wind direction!

Here's how to determine the direction of the wind:

1. Judge the wind: the denser the isobar, the greater the wind.

2. Draw the pressure gradient force. According to the value of the isobar, the high pressure and low pressure are determined. Perpendicular to the isobar, from high pressure to low pressure, that is, the direction of the pressure gradient force.

3. Draw the direction of the wind. Considering the influence of geostrophic deflection forces (north-right, south-left), the pressure gradient force is deflected to the right in the Northern Hemisphere, which is the wind direction.

Introduction to wind direction

Meteorologically, the direction in which the wind is blowing is determined as the direction of the wind. The smaller the distance from the outside to the center, the smaller the wind frequency, which is the minimum wind frequency in the local area. In the figure, the easterly wind is the dominant wind direction, and the southwest wind is the minimum wind frequency.

Note: The downwind side of the dominant wind direction is not necessarily the upwind side of the minimum frequency wind direction. Minimum Frequency Wind Direction:

The wind direction with the least number of occurrences. Maximum Frequency Wind Direction: A dominant wind direction that prevails throughout the year.

The upwind side refers to the direction in which the wind is blowing, and the downwind side refers to the direction in which the wind leaves. For example, if a person is standing and the wind blows from the front to the face, then the direction facing the face is the upwind side; The direction of the back, i.e. the direction in which the wind leaves, is the downwind side.

How to judge the wind according to the direction of the wind:

1. Use the sea level isobar distribution map to judge. The near-surface wind direction crosses the isobar diagonally, deflecting to the right in the northern hemisphere and to the left in the southern hemisphere.

2. Judge according to the distribution of sea and land. The sea and land breeze blows from the sea to the land during the day and from the land to the sea at night.

3. The wind near the ground crosses the isobar diagonally, and the wind in the sky is parallel to the isobar.

Wind direction refers to the direction in which the wind is blowing; Generally, there are different methods for determining wind direction, which are mainly divided into ocean, continent, and high altitude.

In general, the hemispheric cyclone has a northwest wind on the west side, a southeast wind on the east side, a northeast wind on the north side, and a southwest wind on the south side; Southwesterly winds on the west side, northeasterly winds on the east side, northwest winds on the north side, north-south southeast winds on the southern hemisphere cyclone; Northern hemisphere anticyclone west southeast wind, east northwest wind, north southwest wind, south northeast wind; Southern hemisphere anticyclone west northeasterly, east southwesterly, north southeast, south northwest.

1. Use the sea level isobar distribution map to judge. For example, in the Northern Hemisphere sea level isobar distribution map, A is the center of high pressure and B is the center of low pressure, defined according to the direction of the wind.

2. Use the characteristics of monsoon climate to judge. In winter, northerly winds are mainly blowing; In summer, southerly winds are blowing. In the winter in South Asia, northeast winds blow; In summer, the wind blows from the southwest.

3. Use temperate oceanic climate and Mediterranean climate to judge. According to the characteristics of the climate, the temperate oceanic climate blows westerly winds all year round, southwest winds blow in the northern hemisphere, and northwest winds blow in the southern hemisphere. The Mediterranean climate blows westerly winds in winter.

4. The wind in the sky is parallel to the isobar.

Wind direction measurement

One of the instruments for determining the wind direction is the wind vane, which is generally 10-12 meters high from the ground, if there is an obstacle nearby, its placement height should be at least 6 meters higher than the obstacle, and the short rod pointing north should be facing the north. The direction in which the wind arrow points indicates the direction of the wind at that time. There is also a rectangular air pressure plate (800 grams for the heavy and 200 grams for the light one) next to the air pressure plate, which is equipped with a curved frame with long and short teeth.

The number of long and short teeth raised by the air pressure plate indicates the strength of the wind.

Make your own weather vane and easily judge the wind direction!

There are three methods commonly used in geography in secondary school:

1. Use isobars to judge: the wind flows from high pressure to low pressure, the northern hemisphere deviates to the right, and the southern hemisphere deviates to the left.

2. Use the local wind belt to judge, this method is mainly applicable to the west coast of the mainland. The trade wind belt is about 10-20 degrees north and south latitude, with northeasterly winds in the northern hemisphere and southeast winds in the southern hemisphere; The westerly wind belt is about 40 degrees north and south latitude, with southwest winds in the northern hemisphere and northwest winds in the southern hemisphere; The easterly wind belt is mainly around 70-80 degrees north and south latitude, with northeasterly winds in the northern hemisphere and southeast winds in the southern hemisphere.

3. Take advantage of the local monsoon climate.

Judgment, suitable for monsoon climate zones, mainly on the east coast of the continent. The Northern Hemisphere has southeasterly winds in summer, northwest winds in winter, northeasterly winds in summer, and southwesterly winds in winter in the Southern Hemisphere (note that winter and summer in the Northern and Southern Hemispheres are reversed). But there is one local exception, namely the Indochina Peninsula in South Asia and Southeast Asia.

China's Hainan Island.

and southern Taiwan, northeast winds in January and southwesterly winds in July.

In addition, if we are concerned about the thermal circulation, the near-surface wind blows from the low temperature (high pressure) to the high temperature (low pressure), plus the geostrophic deflection force to the right in the northern hemisphere and the left in the southern hemisphere.

The direction of the wind is the direction in which the wind is blowing. When the wind blows from the north, it is the north wind, and when the wind blows from the south, it is the south wind. The horizontal pressure gradient force is drawn first, and then the geostrophic deflection force is drawn according to the hemisphere, and the geostrophic deflection force is perpendicular to the horizontal pressure gradient force, with the northern hemisphere to the right and the southern hemisphere to the left.

Point to the same. The wind direction is between the horizontal pressure gradient force and the geostrophic deflection force, and the angle is arbitrary.

Judgment method. Geographical aspects.

The horizontal pressure gradient force is directed from high pressure to low pressure, perpendicular to the isobar;

The wind is biased to the left in the southern hemisphere and to the right in the northern hemisphere;

There is no pointing mark, and the default is "up, north, down, south, left, west, right, east", and there is a pointing mark, which is judged according to the pointing mark.

aspects of life. In which direction the red flag flies, or hold a thin silk scarf in your hand and hold it in the air to see where the silk scarf flies; Or grab a handful of sand from the ground and sprinkle it in the air to see which direction the wind is.

Related Applications:

Since ancient times, people have consciously or unconsciously used its power in various fields such as production and life, and there have been examples of damage caused by not learning the law.

1. Wind and traffic.

It is best to choose the direction of the headwind when the plane takes off or lands, so the runway of the aircraft should be in line with the direction of the wind. Sailing should be downwind, which will increase speed and save fuel. Headwinds are the opposite.

2. Wind and energy.

Wind farms can be built in windy inland and coastal areas, for example, along the northwest and eastern coasts of China.

3. Wind and agriculture.

For example, China's winter monsoon, hot and dry winds, typhoons, India's southwest monsoon, etc., will have an impact on agriculture.

4. Wind and urban planning.

In urban planning, industry should be placed downwind of the prevailing wind, and residential areas should be placed upwind; If it is a monsoon area, the industrial area should be placed on the outskirts of the vertical wind direction. The selection of high-end residential areas should be laid out in the upwind direction or at the minimum wind frequency. For example, in order to avoid air pollution, considering the multi-monsoon climate of China's southeast coast, the industrial layout should be located in the suburbs of the vertical wind direction, so it is wiser to choose A.

In this way, the impact of industry on residential areas is minimal.

5. Wind and field investigation.

When fielding, the direction can be judged based on the shape of the canopy. Observe the direction of movement of the moving sand dunes in the desert.

Make your own weather vane and easily judge the wind direction!

Judgment method.

1. Geography.

The horizontal pressure gradient force is directed from high pressure to low pressure, perpendicular to the isobar;

The wind is biased to the left in the southern hemisphere and to the right in the northern hemisphere;

There is no pointing mark, and the default is "up, north, down, south, left, west, right, east", and there is a pointing mark, which is judged according to the pointing mark.

Second, the aspect of life.

In which direction the red flag flies, or hold a thin silk scarf in your hand and hold it in the air to see where the silk scarf flies; Or grab a handful of sand from the ground and sprinkle it in the air to see which direction the wind is.

The gale is coming

1) Try to go out as much as possible, ride less bicycles when you must go out, and do not stay under billboards and temporary buildings to avoid the wind.

2) If you are driving, you should drive into an underground parking lot or shelter.

3) If you live in a tent, immediately put away the tent and take shelter from the wind in a sturdy house.

4) If you are working or swimming on the water, you should go ashore immediately to avoid the wind, the ship should obey the command, return to the port to avoid the wind, and the sailboat should lower the sails as soon as possible.

5) In the room, carefully close the window, paste the "m" shaped tape on the window glass to prevent the glass from breaking, stay away from the window, and avoid strong wind sweeping the sand and gravel to break the glass and hurt people.

6) In public places, evacuate to the designated place.

7) Agricultural production facilities should be strengthened in time, and mature crops should be harvested as soon as possible.