how does barometric pressure affect your chances of rain?
597267
Lower pressure will result in more "convection," or vertical movement of moisture.  So in general, the lower the pressure the better chance of precipitation.
652652
Actually, no one has quite gotten into the reality.  Rain is almost all rain.  But something like 99% of all precipation drops form around something called condensation nuclei.  Basically that's a fancy term to say some small particle in the air.\nThis can be dust, clay, sea salt, pollutants (leading to smog, acid rain, etc), even tiny insects... whatever's available.  Water actually takes advantage of the particle's curvature, allowing water to condense even though the air isn't 100% saturated.\nCloud seeding is an attempt to induce additional rainfall by adding more particles.  It is only marginally useful in most places.\n\nThere are also small amounts of mixed in gases (nitrogen and oxygen mainly) and any other pollutants the raindrop comes into contact with while falling through the atmosphere.\n\nBut mainly rain is just water.  Awesome stuff, too!\n\nHope I helped,\nGod bless,\nShane
55710
Weather affects air pressure.  This affects man.  Some are sensitive to the change in air pressure and can result in headache and knee pain and more.
1017010
It is more complicated than that.  So I'll just explain it all.  \n    What Makes Weather: "Weather" is caused by uneven heating of the earth's surface. Warm air is lighter than cold air, so it rises. Rising air would create a vacuum, but nature won't permit that, so surrounding air rushes in to fill the void that rising air is trying to create. The result is "wind". Also, its the warm air, rising air in one area, and the cold, descending air in a different area that creates differences in air pressure, i.e. barometric pressure, and at any given spot in the world this pressure is constantly changing. We humans seem a bit out of tune with barometric pressure changes, as they don't seem to affect us as much, at least outwardly. Do these pressure changes affect other land animals? Probably so. Some of this we can maybe document, but a lot of this is still open to further study. Most anglers agree that fish react considerably to changes in air pressure. Why? To understand the answer to that question, we should think of the "air" above as pushing down on a lake or river because of the air's weight. We now know that the weight of that air is constantly changing through air pressure changes. One key to why fish are so affected by air pressure changes is that when air pushes on the water there's no place for it to go, or at least there's very little water compression. Further, when air compresses down against a body of water, the pressure in the water itself is more (water pressure) than the difference than the air pressure has experienced because air will compress so much more. The "standard" for barometric pressure is 29.92 inches of mercury at sea level. This means "standard" air pressure will hold up 29.92 inches of mercury (if it's inverted just so). If air pressure increases, i.e. there's more weight on it, the pressure goes up, maybe to 29.99, 30.13, something like that. If air pressure goes down, there's less weight pressing down on it, so the numbers might read 29.85, 29.79, something like that. The thing to remember is that while you might imagine these fluctuation to be small (maybe because we can't feel them), fish like bass do feel these changes, perhaps dramatically because the air above is pressing down on the water where they live and the changes in the water pressure are much more dramatic than in the air.\n\nHow Pressure Affect Bass: Sorry for that lengthy explanation, but maybe this is the first time you've been able to better understand what barometric pressure is, as well as why fish are maybe more affected by these changes in their watery environment. One of the reasons bass are so challenging is that they seem more influenced by environmental changes like barometric pressure. These atmospheric pressure changes affect shallow water bass more than they do the deeper dwellers. It is thought that fish are able to monitor pressure changes via their swim bladder. We can assume that when barometric pressure goes up (higher), bass feel increased pressure on their swim bladder. The swim bladder might even compress. Does this make them feel lethargic, uncomfortable, less inclined to feed? Might high pressure even affect their equilibrium or sense of balance? Probably so on all counts, or at least that's what many people are theorizing at this moment. Recall how a bass reacts when it is kept out of the water longer than it normally take to release it? They turn on their side when you turn them loose. One plausible reason this might occur is that by being out of the watery environment for a while, their swim bladder expands considerably, fouling up their equilibrium. It probably takes a bass quite a long time to recover from this. Same deal with a marked air pressure change (up or down) which in turn affects the pressure in the water.\n\nHow To Check Your Local Pressure: What about the barometers you keep in your house? Are
919589
Winds pick up water vapor as they blow across oceans, and drop the water as rain as they blow across islands and  continents, generally losing more water as the elevation rises.  \n\nAs the air and clouds blow over higher ground, the temperature drops and causes the water to precipitate, forming rain.  There is a "rain shadow," on the leeward side of the higher ground in the center of an island or continent, because the clouds drop the rain on the "windward" side of a mountain (side toward the wind), leaving the "leeward" side drier (side that's sheltered from the wind).\n\nThe winds blowing across the ocean pick up water and bring rain to India, bringing more rain as they first come to the land, raining as the elevation rises, and then raining less after they cross the higher ground in the central parts of India. \n\nHope this helps.
3100
Atmospheric pressure is continually fluctuating, and researchers in the Ukraine have found that slight low-frequency atmospheric oscillations can influence human mental activity, causing significant changes in attention and short term memory functions. So next time you find it hard to concentrate at work, blame it on the pressure!
929539
wind is caused by the movement of air from regions of high atmospheric pressure to regions of low atmospheric pressure.  high pressure is caused by the cooling of air: as air cools, it shrinks and becomes more dense and its pressure therefore increases.  low  pressure is caused by the heating of air: as air warms, it expands and becomes less dense and its pressure therefore decreases.\nrain is caused by the rising of columns of air: when a bubble of air is warmer than its surroundings, it expands and becomes less dense.  this less dense air rises, and as it rises, it gets cooler.  as it cools, it becomes less able to hold moisture.  eventually, you reach a point at which the air can no longer get any cooler without having to lose some moisture.  it is at this point that clouds and rain start to form.\nyou get storms if you have the right combination or rain, wind, air pressure, humidity, and clouds.
1172351
wind has entirely everything to do with pressure, not so much temperature..but since temperature differences causes pressure differences, i'll let it slide\n\nWind always flows from High to Low...and as you see on weather maps, meterologists give these highs and lows numbers..corresponding to the pressure on a barometric scale\n\nso if you have a high pressure system of 31.15" of Mercury..and a low pressure of 28.45" of Hg then you have whats called a pressure gradient\n\nas this pressure gradient increases (the high gets higher and the low gets lower) the wind strength increases...\n\nSo the strength and direction of wind is created by the pressure gradient..but its also influenced by teh earths rotation..this is called the coriolis force...the fact of the matter is, is that the air is moving over a rotating surface..so in the Northern Hemisphere, the wind is seemingly deflected to the right..because the earth is spinning
691288
High pressure keeps the surronding area free of clouds and other weather phenomena.  No clouds and no rain = a nice day.
875267
by the effect of wind.\n      the rain comes from too height & there the speed of air is very fast 'n' due to it the angle deflected.this deflected angle is very short but the height is too large so it seems like a big deflection.
367321
Yes it can and it does....have you ever felt a change in your body and then realised it happened because rain started to fall outside ?
179150
If you mean barometric pressure, both higher pressure and lower temperature inrease air density.  This means more available engine power at a given altitude, lower speed and less power needed to obtain a given amount of lift, and more loss due to drag at a given speed.
36815
From the National Weather Service:\n\nWhen we talk about rainfall, we usually refer to it as being either showers or rain. If we are forecasting showers, we expect the rain to fall on an intermittent basis and from cumulus-type clouds. The showers may vary greatly in intensity over just a few minutes or a few miles. For example, lets say that the forecast for today is calling for a chance of showers. That means that if the rain does develop, it will be on and off, rather scattered, may vary in intensity over just a couple of minutes, and fall from cumulus-type clouds.\n\nIf the forecast for today called for rain, it means we expect the rain to fall rather steadily and from a flat, stratus-type of cloud, and won't change much in intensity from hour to hour. It also means that the rain will fall over a fairly large area, not like showers, which usually fall over smaller areas.
73372
When the cold air touches the warm air, the humidity in the warm air will condense and fall as rain. The intensity of the rain will depend on how much humidity is in the air and the temperature difference between the cold and warm front.\n\nIf a 30°F cold front touches a 70°F warm front and there's a lot of moisture in the air, then it results in a massive thunderstorm.\n\nIf you see the doppler radar pictures on the news, you'll see that rain usually comes in bands. That band of rain is the leading edge of a cold front.
185447
The list can go on and on, but as the previous poster mentioned, they are virtually all associated with low pressure areas at some level (surface &/or aloft).\n\nA few examples are:\n\nOrdinary (synoptic scale) Lows\nNor'easters\nAlberta clippers\nColorado Lows\nInverted trofs\nInland runners (in from the Atlantic coast)\nCoastal Lows\nHurricanes\nTropical cyclones\nMesoscale convective systems\nShortwave trofs (aloft)\n\nSome meteorologists take great pride in naming them or knowing the names - which is not really the important thing, though it can help a person understand them and thus predict them better.
669862
Wow. If the air at ground level is very dry, the rain will evaporate before it can hit the ground. This is called "virga."
331961
It indicates a drop in pressure which usually means windy weather on the way and probably rain too.