If you space a regular viewer of weather broadcasts, opportunities are you’ve heard the following from your regional TV meteorologist: “plenty that sunshine is in store today as high pressure is in regulate over the area.” Or: “expect rain to spread into the area as a low pressure device approaches.” the is well created that high press is generally connected with quite weather, when low press is generally linked with cloudy, rainy, or snowy weather. However have you ever before wondered why??


In order to know the species of weather problems generally associated with high and also low pressure systems, we need to think “vertically.” The motion of wait in the atmosphere over our top plays a large part in the weather us experience below at earth’s surface. Basically, air cools as it rises, i m sorry can reason water vapor in the air come condense right into liquid water droplets, sometimes forming clouds and also precipitation. Top top the various other hand, sinking waiting is associated with warming and drying conditions. Therefore the an initial important allude to save in mind is climbing air = moistening, sinking wait = drying.

You are watching: Low pressure systems are usually associated with clear weather.

So what go this have to do with high and also low pressure? Well, high pressure is linked with sinking air, and also low push is linked with climbing air. But why? The answer needs to do with the usual air flow roughly high and low pressure. Physically, it appears to make feeling to have air circulation from high pressure to short pressure. For factors I won’t acquire into in this post, the air flow (due come the Earth’s rotation and also friction) is directed slightly inward toward the low pressure center, and slightly outward away indigenous the high press center:


The contempt inward moving air in short pressure causes air to converge and also since the can’t relocate downward because of the surface, the wait is compelled upward, leading to condensation and precipitation as disputed earlier. The opposite occurs through high pressure. Wait is relocating away native the high pressure center at the surface (or “diverging”) so as a result, waiting from above must sink to take its place. The surface circulation is attach by the opposite actions at top levels the the atmosphere, as illustrated in this schematic diagram:


Now over there is much much more to the than just high pressure = quite weather and low press = poor weather (otherwise I would be out of a job!), yet hopefully after analysis this, you have a better understanding of why meteorologists talk around pressure systems. Desire to take it the following step? Learn about warm and also cold fronts here.

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