How high and low pressure affect weather

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How high and low pressure affect weather



But it’s crucial in storm development. Differences in pressure drive the wind. You encounter this when you open up a vacuum-sealed can. That “whoosh” noise you hear is high pressure from the outside world blowing into the low pressure inside the vacuum-sealed tuna fish!Get more news about high and low pressure components wholesaler,you can vist our website!

Nature is constantly looking to stay in balance. So the high pressure, or “too much of something,” is moving toward low pressure where “there is a deficit.”Think of the atmosphere as an ocean — an ocean of “air.” We’re at the bottom of that ocean.

So it makes sense, just like a water ocean, the highest pressure is at the bottom, and the pressure toward the surface of the water has the lowest pressure.

Just like with the water ocean, the atmosphere has a weight to it. At the bottom of the ocean, you have the pressure of all that water on top of you.

During normal conditions, the weight of the atmosphere at sea level is 14.7 pounds per square inch pushing down on our heads. But wouldn’t that weight crush a 20′ x 20′ table? No, because just as much atmospheric weight is pushing up on the bottom of the table and on the sides of that table. Nature and balance, thankfully it all evens out!

The air gets “thinner,” or there is less of it as you go higher in altitude. This is why you would need oxygen to climb Mount Everest! There is also less atmospheric pressure here. You’re almost at the top of the atmospheric ocean.So we established that high pressure moves toward low pressure. But in the atmosphere, it doesn’t do it in a straight line. This is because our planet is spinning. So in the Northern hemisphere, high pressure pushes air out of it in a clockwise pattern. Low pressure draws air and wind into it but in a counter-clockwise rotation. This is called the “Coriolis force.”

What weather is associated with high pressure?
In order for us to have clouds, precipitation and storms, we need air to be rising.

That doesn’t happen with high pressure. It stands to reason, if the air is moving out from high pressure at the surface, then air must fill in the void of the air that’s leaving. So with high pressure, air sinks from aloft to fill that void. Again, air needs to rise for clouds and storms.

What weather is associated with low pressure?
The opposite is true of our lousy, low-pressure. Air is piling up into the low at the surface, and that air has to go somewhere! You guessed it — it rises! The result is clouds, precipitation and storm development. Tropical storms and hurricanes are caused by low pressure.