Is this southern snow storm a cold front or a quasi stationary front 20

To put it simply, it is caused by the convergence of cold and warm fronts.

Specifically, there are two main reasons for this snowfall, which are explained by the macro changes in the global climate and the specific weather process of the snowfall in the south.

The first reason (macro reason) is that we are in a La Niña state this year, that is, the sea surface temperature in the eastern equatorial Pacific is lower than normal and below the negative degree, and the impact of this phenomenon on China's climate is very obvious. It's going to have a cold winter, so we can see that this cold winter is coming this year.

The second reason (specific reason), the two conditions that must be met for snow or rain are 1Warm and humid air currents from the tropics. 2.

There is cold air from the alpine regions. Areas of winter snowfall (the same is true for areas of summer rainfall) are located near the front, at the junction of warm and cold air masses. This position is not fixed, it is determined by the strength of the forces of the two natures.

The cold air mass is weak, and the front and precipitation area are higher latitudes, and the cold air mass is stronger, and the front and precipitation areas are lower latitudes. The land cold high that affects China in winter is the Asian high (also known as the Mongolian and Siberian high pressure) centered in Mongolia and Siberia, and its sphere of influence is very large, which has a great impact on the weather in China, especially in the northern region. The cold air that affected our country in the early part of midwinter this year is relatively weak, and the number of times is not much, even with the cooperation of warm and humid airflow, it is not easy to snow without cold air.

However, since 2008, the Asian high pressure is very active, and the cold air mass continues to form southward to affect our country, resulting in a wide range of windy cooling weather, but because the warm air mass in the south this year is also very active, a large number of warm and humid air currents from the Pacific Ocean and the Indian Ocean frequently visit the southern region, when the strong cold air mass from Siberia, Mongolia quickly moves south to the southern region, and meets with the warm and humid air mass, the cold, warm and two just combined. Affected by the combination of these two airflows, there has been a lot of rain and snow in recent times, especially in the Yangtze River basin, and the weather has been maintained at low temperatures for a long time. If there is only a strong cold air mass, and there is no large amount of water vapor provided by the warm and humid air mass, there will only be strong winds and cooling weather in the south;If there is only a large amount of water vapor provided by the warm and humid air mass, and no cold air mass is present, there is no catastrophic weather at all.

And when both are in place, disaster strikes.

Specific problems are analyzed in detail.

If it is said to cause widespread snowfall in a wide area of our country.

That's because of the cold front.

The cold front from Siberia is strong, all the way south, causing heavy snowfall in a large area of our country;

If you ask about causing a large-scale snow disaster, I think it is better to say that it is better to have a stationary front.

The cold front moved southward, weakened and became a quasi-stationary front, and due to the sharp drop in temperature and the fact that it could not rise for a long time because of the quasi-stationary front, it caused a large-scale and long-term snowfall across the country, forming a snow disaster.

1. All the cold fronts in the north are due to the influence of the interaction between the Siberian high and the Pacific low in winter, and the high pressure flows;

The quasi-stationary front in southwest China is mainly caused by the influence of topography, and the Yangtze River basin is mainly formed by the weak cold and warm fronts.

There are many warm fronts in Western Europe, mainly because the region is at high altitudes.

The front formed by the cold air mass actively moving towards the warm air mass is called a cold front. The cold front is the most common kind of front in China, and it can be active all over the country. Due to the different configurations of the cold front and the upper-air trough, the distribution of clouds and precipitation near the cold front is also obviously different, and some mainly appear behind the front. Others are mainly found in front of the front.

When the forces of the cold and warm air masses are equal, or when the southward strength of the cold air weakens and is blocked by the topography, so that the interface between the cold and warm air masses is stationary, a [quasi] stationary front is formed.

A cyclone is a large vortex in the northern (southern) hemisphere, in which the horizontal air flow rotates counterclockwise (clockwise) in the atmosphere, radiating from all sides to the center, counterclockwise in the northern hemisphere and clockwise in the southern hemisphere. At the same altitude, the pressure at the center of the cyclone is lower than around it, also known as low pressure.

An anticyclone is a large-scale air vortex that occupies a three-dimensional space. In the Northern Hemisphere, the anticyclonic region rotates outwards clockwise from the centre and counterclockwise in the Southern Hemisphere. In the weather map, an anticyclone is a high-pressure area where the isobars are closed and the pressure value decreases outward from the center, so it is also called high pressure.

Cold front, warm front, quasi-stationary front This is a meteorological term, the interface between cold and warm air masses is called a front, the horizontal range can be from hundreds of kilometers to thousands of kilometers, the line where the front intersects with the ground is called a front. Fronts and fronts are generally referred to as fronts. Due to the high density of cold air and the low density of warm air, generally when cold and warm air masses meet, the cold air mass is under the front and the warm air mass is on the front.

Because there are obvious differences in temperature, humidity, air pressure, wind, etc., there are obvious differences between the two sides of the front, so it is often accompanied by clouds, rain, strong winds, and other weather near the front. In the process of front movement, fronts can be divided into cold fronts, warm fronts, and quasi-stationary fronts according to the different primary and secondary positions of cold and warm air masses. A cold front is a front in which a cold air mass actively moves in the direction of a warm air mass.

A warm front is a front in which a warm air mass actively moves towards a cold air mass. Cold and warm air masses on both sides of the front are evenly matched, or when blocked by terrain and the movement is small, this type of front is called a quasi-stationary front.

In addition to the cold front is the warm front, I hope our relationship will change back to the meaning of the quasi-static front, it should be that the relationship between the two should not be cold for a while, hot for a while, and hope to be more stable.

This poem describes the spring scenery of Shanxi, otherwise how could the shepherd boy refer to Xinghua Village in the back. Shanxi in April, of course, is still a world of cold air, and the slow cold front will bring relatively continuous precipitation, so it is called rain. If you move quickly to the cold front, I'm afraid there will only be strong winds.

A cold front is the most likely.

Cold front. Warm front.

Quasi-stationary front. Concept.

A front in which the cold air mass actively moves in the direction of the warm air mass.

A front in which a warm air mass actively moves in the direction of a cold air mass.

A front in which the cold and warm air masses are equally powerful, making the front swing back and forth. Host. Want.

District. Other. Air Mass Forces. The cold air mass is strong, and the warm air mass is weak.

The warm air mass is strong, and the cold air mass is weak.

Neck and neck. Direction of movement.

The direction in which the cold air mass is moving.

The direction in which the warm air mass is moving.

Swing back and forth. Forward Forward Forward.

The warm air mass is in the front, and the cold air mass is in the back.

The cold air mass is in the front, and the warm air mass is in the back.

Frontal strength. Larger. Smaller. Small.

Location of the rain zone. There are both forward and backward forwards, mainly behind the forwards.

Forward Forward. Extends to a large area behind the front.

Rain area range. Small. Middle. Big.

Icon. Frontal diagram.

Diagrams. Weather chart. Rain. Sky.

Gas. Special. Attack. Before crossing the border.

Single warm air mass control, warm and sunny.

A single cold air mass is controlled, and the temperature is low and clear.

Single-air mass control, sunny weather.

When crossing borders. The warm air mass is lifted by the cold air mass, and weather phenomena such as cloudy, rainy, windy, and cooling often occur.

The warm air mass slowly climbs along the cold air mass, cooling and condensing to produce continuous clouds and rain.

The warm air mass rises or climbs smoothly, forming continuous precipitation.

After crossing the border. The cold air mass replaces the original warm air mass, the air pressure rises, the temperature and humidity plummet, and the weather is clear.

The warm air mass occupies the position of the original cold air mass, and the temperature rises, the air pressure drops, and the weather clears.

Single-air mass control, sunny weather.

Weather examples. Most of the precipitation weather in our country, such as the heavy rain in the northern summer; strong winds, sandstorms, and cold waves in winter and spring; "An autumn rain and a cold".

a spring rain and a warmth"; During the Qingming season, it rained a lot".

plum rain in the Jianghuai region;

Guiyang has half a year in winter, "there are no three sunny days".

The warm air mass advances the warm front.

Cold air masses are recommended Cold fronts.

A quasi-stationary front is an evenly matched warm and cold air mass.

It is divided according to the different primary and secondary positions of cold and warm air masses.

The Qingming season is the rainy season, and the cold front and the warm front hold each other, which belongs to the quasi-stationary front, and the saying is different! What else is the answer.

According to the movement direction and structural conditions of the cold and warm air masses on both sides of the front, the fronts are generally divided into four types: cold fronts, warm fronts, quasi-stationary fronts and prison fronts.

A cold front is a front in which a cold air mass pushes the front towards the side of the warm air mass. Cold fronts are divided into type 1 (slow) cold fronts and type 2 (fast) cold fronts depending on the speed of movement.

A warm front is a front in which a warm air mass pushes the front to move towards the side of the cold air mass.

A quasi-stationary front is a front in which the cold and warm air masses are equal or sometimes the cold air masses are dominant, and sometimes the warm air masses are dominant, and the front rarely moves or is in a state of swinging back and forth.

When the cold front catches up with the warm front, the warm air between the two fronts is lifted off the ground and imprisoned to a high altitude, and the cold air mass behind the cold front comes into contact with the cold air mass before the warm front.

b.The strength of the cold and warm air masses.