Changes in atmospheric pressure are one of the most commonly used ways to forecast changes in the weather because weather patterns are carried around in regions of high and low pressure (see Air Mass). A slowly rising atmospheric pressure, over a week or two, typically indicates settled weather that will last a long time. A sudden drop in atmospheric pressure over a few hours often forecasts an approaching storm, which will not last long, with heavy rain and strong winds. Pioneering meteorologist Vice-Admiral Robert Fitzroy once noted: "long foretold, long last; short notice, soon past".
By carefully watching the pressure on a barometer, you can forecast local weather using these simple guidelines:
For pressure tendency, the definitions used by these guidelines are:
over 3 hourshPain-Hgmm-HgSteady Less than 0.1 0.003 0.08 Slowly rising or falling 0.15 to 1.5 0.003 to 0.04 0.08 to 1.1 Rising or falling 1.6 to 3.5 0.05 to 0.1 1.2 to 2.6 Quickly rising or falling 3.6 to 6.0 0.1 to 0.18 2.7 to 4.5 Rapidly rising or falling More than 6.0 0.18 4.5
Guidelines and table adapted from: Weather Doctor's Weather Eyes.
hope you like it and it helps you
If you mean what 'goes' up when the rain comes down, then the answer is the barometric pressure. A low pressure cell, which is a chief indicator of a rain storm, occurs when the barometric pressure drops below 30 points. As the storm dissipates, the low pressure cell changes, causing the barometric pressure to rise.
In general, barometric pressure, or atmospheric pressure, drops as you go up in elevation. For example, at 18,000 ft. above sea level, the average barometric pressure is about half the average pressure at sea level (see the related links for charts) However, barometric pressure also varies widely with the weather (weather charts almost always show the movement of low pressure and high pressure zones), so true barometric pressure cannot simply be calculated, but must be measured. In the United States, the National Oceanic and Atmospheric Administration provides hourly barometric readings for many locations across the country (see related National Weather Service measurement link)
Actually it's the other way around because decreasing barometric pressure initiates the upward flow of air that is essential for cloud development and then rain. Hope this helps! :) Actually no, because decreasing barometric pressure at the surface is a result of rising air and it also causes convergence of air at the surface. Sometimes in thunderstorms when the downdraft (ie rain and hail) is intense, it can actually cause a rise in barometric pressure at the surface since the air has a strong sinking motion hence the name downdraft. Thanks to the above user for attempting to give a correct and complete answer, but this answer from me is more correct and complete.
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