High and Low Pressure

"Because there are plenty of suns out there today, if you watch periodic weather broadcasts regularly, you hear the following message from a local television meteorologist "If it is expected that there will be an approaching low-pressure system, rainwater is spreading in this area, but high pressure is usually associated with good weather, low pressure can be related to cloudy, rainy or snowy weather It is well known, but why have you thought about it?

In order to understand the types of weather conditions normally associated with high pressure and low pressure systems, we have to think "vertically". The movement of air in our atmosphere above the atmosphere plays a big part in the weather we encounter on the surface of the earth. Basically, the air cools as it rises, which condenses the water vapor in the air into droplets of liquid, sometimes clouds and precipitation. On the other hand, the subducting air is related to heating and drying conditions. Therefore, the first point to remember is that the increase in air = wet, sinking air = dry

So, what is the relationship between high pressure and low pressure? Well, high pressure is related to subduction of air, low pressure is related to air rise. but why? The answer relates to typical airflow around high pressure and low pressure. Physically, the flow of air from high pressure to low pressure seems to be meaningful. Since I am not going into this article, the air current (due to the rotation and friction of the earth) is directed slightly inward toward the low pressure center and slightly away from the high pressure center.

Air moving slightly inwardly at low pressure converges the air and since the surface can not move downwards, the air is forced up and causes condensation and sedimentation as described above. The opposite situation occurs under high pressure. Since the air moves away (or "diverges") from the high pressure center of the surface, the air from above must sink in order to replace that position. As shown in the figure, the surface flow is accompanied by the opposite behavior of the upper layer of the atmosphere.

Not only that now. High pressure = bad weather and low pressure = bad weather is not the only thing (otherwise I will go unemployed!), But hopefully you can understand why meteorologists talk about pressure system. Do you want to take the next step? Learn about the warm and cold front here

As you can always find more weather information on Facebook, Twitter, even Snapchat, please keep it!

Atmospheric pressure on the earth surface is one of the key elements of weather. This is also the reason why weather charts are characterized by H and L. High pressure and low pressure are important as weather is affected. A weather chart such as a weather chart on a TV shows what is happening on the surface of the earth. As its name suggests, "high" refers to the area where the air pressure is higher than the ambient pressure. "Low" is a low place. Meteorologists do not have specific figures to distinguish between high pressure and low pressure, but this is a relative difference.

So, what is the relationship between high pressure and low pressure? Well, high pressure is related to subduction of air, low pressure is related to air rise. but why? The answer relates to typical airflow around high pressure and low pressure. Physically, the flow of air from high pressure to low pressure seems to be meaningful. Since I am not going into this article, the air current (due to the rotation and friction of the earth) is directed slightly inward toward the low pressure center and slightly away from the high pressure center.

What is the cause of the flow? Naturally, the answer is pressure difference. In fact, there is a very simple relationship between horizontal flow and pressure. The flow rate is from high pressure to low pressure. The larger the pressure difference between the two points, the larger the flow rate. This relationship can be expressed as the pressure at two points, such as at both ends of the tube, is the flow resistance. Resistance includes everything that affects flow rate other than pressure. For example, a long tube is bigger than a short tube. The larger the viscosity of the fluid, the larger the value. Turbulence increases significantly, tube diameter decreases