What is the symbol of a sandstorm? What is the symbol of a sandstorm?

Dust storm. Sand-Dust Storm) is a general term for sand storm and dust storm, which is a sign of desertification. It refers to a disastrous weather phenomenon in which strong winds roll up a large amount of sand and dust from the ground, making the horizontal visibility less than 1 km, and having the characteristics of suddenness and short duration.

1] Sandstorm refers to a sandstorm formed by strong winds blowing a large amount of sand into the near-surface layer; Dust storms are winds that bring large amounts of dust and other fine particulate matter to Egypt.

A storm formed by being caught up in the sky.

Chinese name. Dust storm.

Foreign name. sand-dust storm

Include. Sandstorms and dust storms.

Frequent areas. Northwest China, North China.

Formation conditions. Strong winds, strong thermal instability, and sand sources.

Fast. Navigation.

Historical causes, morphological characteristics, classification of sand and dust storms, main hazards, ecological effects, prevention and control measures, monitoring methods, historical records, statistical data and laws and regulations in frequent areas.

Research history for additional information.

Definition. A sandstorm is a weather phenomenon in which strong winds blow dust and sand on the ground, making the air very turbid, and the horizontal visibility is less than 1 km. [2] Sandstorm is a weather phenomenon in wind erosion desertification, and its formation is affected by both natural factors and human activities.

Natural factors include high winds, reduced precipitation, and their sources of sand. Human activity factors refer to the frequency of sandstorms caused by the destruction of vegetation by humans in the process of economic development.

Increase. [3]

Sandstorm weather mainly occurs in winter and spring, which is due to the semi-arid and arid areas in winter and spring with little precipitation, the surface is extremely dry and loose, and the wind erosion resistance is very weak.

The symbol of a sandstorm is an arrow drawn in the middle of the English letter S, which is generally represented by one arrow, and a strong sandstorm is represented by two arrows.

In weather forecasts, dust reports are represented in an S-shape, with a directional arrow crossing the icon in the middle, and the color is yellow. The direction of the arrow represents the direction of the dust storm.

Sandstorm symbol: S with a right-pointing arrow.

Dust storm. The symbol is s. Sandstorm refers to a weather phenomenon in which strong winds sweep a large amount of dust and sand from the ground into the air, making the air particularly turbid, and the horizontal visibility is less than 1 km. The formation of a sandstorm requires conditions such as sand and dust on the ground, high winds, and unstable air conditions.

Sand, dust and hail storms can cause houses to collapse, traffic and power supply to be blocked or interrupted, fires, people and animals, etc., and pollute the natural environment.

Destroy crop growth.

The formation of sandstormsOne is the sand and dust material on the ground. It is the material basis for the formation of sandstorms. The second is strong winds.

This is the power basis for the formation of sandstorms, and it is also the power guarantee that sandstorms can be transported over long distances. The third is the unstable air state. This is an important local thermal condition.

Sandstorms mostly occur in the afternoon and evening, which shows the importance of local thermal resistance conditions.

The 3 bends are the weather symbols of the blowing sand: the blowing sand is caused by the local or nearby dust and sand being blown up by the wind.

Visibility is noticeably reduced, and the sky appears cloudy and yellow. In the north, it is easy to appear in the spring. The wind is strong in the sand weather, and the visibility affected by the pants is between 1 km and 10 km.

The dust weather is divided into four categories: floating dust, blowing sand, sandstorm and strong sandstorm.

When sandstorms occur, it will cause air quality to decline, seriously affect people's daily life and health, and will also have a certain impact on the ecological environment and some facilities to hide agriculture.

Therefore, temporary buildings, facility agriculture, etc. should be reinforced, reduced, or stopped.

Outdoor aerial work to avoid the hazards of sandstorm weather. At the same time, it is necessary to do a good job of protection to avoid sandstorms on human health.

and transportation.

Uppercase s with an arrow in the middle indicating where the sandstorm is going.

China's sandstorm warning is divided into three levels:

1. Yellow warning for sandstorms: sandstorms may occur within 12 hours (visibility is less than 1000 meters), or sandstorms have occurred and may occur and may continue.

2. Sandstorm orange warning: strong sandstorm weather (visibility less than 500 meters) may occur within 6 hours, or sandstorm weather has occurred and may continue sandstorm weather.

3. Red warning for sandstorms: Extremely strong sandstorms (visibility less than 50 meters) may occur within 6 hours, or sandstorms have already occurred and may occur and may continue.

Hazards caused by sandstorms:

1. Environmental pollution

When there is a sandstorm, the sand and gravel and floating dust wrapped in the wind are everywhere, and the air in all the areas passed through is turbid, the nose is foggy, and the number of respiratory diseases and other diseases increases. For example, during the severe sandstorm that occurred in Jinchang City on May 5, 1993, the observed outdoor air dust content was 1,016 millimeters cubic centimeters, and the indoor air was 80 millimeters cubic centimeters, which exceeded the national standard for air dust content in living areas by 40 times.

2. Production and life are affected.

The large amount of sand and dust carried by sandstorm weather covers the sun and shades the sun, and the weather is gloomy, resulting in a decrease in solar radiation, and poor visibility for a few hours to more than ten hours, which is easy to make people feel dull and reduce the efficiency of work and study. In severe cases, it can cause a large number of livestock to suffer from respiratory and gastrointestinal diseases, and in severe cases, it will lead to the death of a large number of "spring shortage" livestock, and scrape away the fertile soil, seeds and seedlings of farmland.

Dust storms can also aggravate the wind erosion and desertification of the surface soil, covering the leaf surface of plants with thick sand and dust, affecting normal photosynthesis and reducing crop yields. The sandstorm also caused the temperature to drop sharply, the sky was like a parasol, and the ground became dark and cold in the shadows.

In the figure, it represents fog, it represents haze, it represents frost, it represents sandstorms, and it represents hail

Therefore, b