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Will it rain when barometric pressure drops?

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2012-09-04 04:58:39
2012-09-04 04:58:39

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:

  • Decreasing barometric pressure indicates storms, rain and windy weather.
  • Rising barometric pressure indicates fair, dry, and colder weather.
  • Slow, regular and moderate falls in pressure suggest a low pressure area is passing some distance away. Marked changes in the weather are unlikely.
  • Small rapid decreases in pressure indicate a nearby change in weather. They are usually followed by short lasting wind and showers.
  • A quick drop in pressure over a short time indicates a storm is likely in 5 to 6 hours.
  • Large, slow and sustained decreasing pressure forecasts a long period of poor weather. The weather will be more pronounced if the pressure started rising before it began to drop.
  • A rapid rise in pressure, during fair weather and average, or above average pressure, indicates a low pressure cell is approaching. The pressure will soon decrease forecasting poorer weather.
  • Quickly rising pressure, when the pressure is low, indicates a short period of fair weather is likely.
  • A large, slow and sustained rise in pressure forecasts a long period of good weather is on its way.

For pressure tendency, the definitions used by these guidelines are:

TermPressure change

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.

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When the barometric pressure drops rain follows.

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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.

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In most storms, which always includes hail storms, the barometric pressure drops. Which the pressure drops, that would allow clouds to form. The more it drops, the more intense the storm can get.

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When the barometric pressure rises it means calm fair weather is coming or is already occurring. When the barometric pressure falls it means foul weather is on the way such as rain and storms and clouds.

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because of barometric pressure

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blood vessels constrict according to barometric pressure

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Low and high pressure systems. Obviously if you have a Low pressure system the barometric pressure will get low. High pressure causes the barometric pressure to rise.

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Pressure drop usually usually signals rain. Rain washes food into the water. Fish will often bite better when the pressure drops because they anticipate food.

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Because conditions were right..Temperature, Barometric Pressure, Humidity

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because when air pressure drops all the good air goes down. The top air then gets gray clouds and rain starts to fall.

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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)

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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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True, yes it does change with the barometric pressure!

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Barometric pressure goes down in a tornado.

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Barometric means "of or relating to atmospheric pressure".

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A sudden decrease in barometric pressure is a sign that a storm is coming.

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A barometer is used to measure the weather. The barometric pressure describes the measure currently in the air.


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