If you room a continual viewer that weather broadcasts, opportunities are you’ve heard the following from your neighborhood TV meteorologist: “plenty that sunshine is in store today together high pressure is in control over the area.” Or: “expect rain to spread right into the area together a low pressure device approaches.” it is well established that high press is generally linked with nice weather, when low press is generally linked with cloudy, rainy, or snowy weather. However have you ever wondered why??


In bespeak to recognize the varieties of weather conditions generally linked with high and low pressure systems, we must think “vertically.” The motion of air in the atmosphere above our heads plays a huge part in the weather we experience here at earth’s surface. Basically, waiting cools as it rises, which can reason water vapor in the air to condense into liquid water droplets, sometimes creating clouds and also precipitation. On the other hand, sinking waiting is linked with warming and drying conditions. For this reason the first important allude to keep in mind is climbing air = moistening, sinking wait = drying.

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

So what does this need to do with high and low pressure? Well, high press is linked with sinking air, and low press is associated with climbing air. Yet why? The answer needs to do with the common air flow approximately high and also low pressure. Physically, it appears to make feeling to have actually air circulation from high pressure to short pressure. For factors I won’t gain into in this post, the air flow (due to the Earth’s rotation and friction) is directed slightly inward toward the low press center, and also slightly exterior away indigenous the high push center:


The slightly inward relocating air in low pressure causes air to converge and also since it can’t move downward as result of the surface, the wait is required upward, bring about condensation and precipitation as disputed earlier. The contrary occurs through high pressure. Waiting is moving away native the high pressure facility at the surface (or “diverging”) so together a result, air from over must sink to take it its place. The surface circulation is accompanied by the opposite behavior at upper levels of the atmosphere, as illustrated in this schematic diagram:


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

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