What conditions are necessary for cloud formation?
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For clouds to form the air has to be unstable, meaning that the air at the surface is warmer than the air above. Remember the saying warm air rises? So when the air rises it hits a level called the Lifting Condensation Level or LCL. If the air rises to this point it then can start to condense on particles in the sky forming clouds.
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cirrus, stratus, and cumulus. however, those are just the three most basic forms of clouds. you have cumulonimbus, for example, which are thunderstorm clouds that form from cumulus clouds. does that help or did i confuse you more????????
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Thunderstorms form when significant condensation, resulting in the production of a wide range of water droplets and ice crystals, occurs in an atmosphere that is unstable and supports deep, rapid upward motion. This often occurs in the presence of three conditions: sufficient moisture accumulated in the lower atmosphere, reflected by high dewpoint temperatures; a significant fall in air temperature with increasing height, known as a steep lapse rate; and a force such as mechanical convergence along a cold front that will focus the lift.
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A cloud forms when moisture-laden warm air rises in a column expanding and cooling with higher elevation until cool enough to condense moisture and produce a visible cloud.  The cloud is not held together but forms over the rising thermals.  When a plane flies through a cloud the ride is bumpy as it hits the various thermals feeding the cloud.  You can ride in a sailplane at Elmira, NY which will glide in a circle and actually rise without power under a forming cloud.
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How Temperature Affects the Formation of Clouds\n\nor perhaps you have some interesting results from your project, like "Cooler Temperatures Increase Cloud Height" - or whatever you have found out from doing your project that you think is interesting!!!
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wikipedia.com\n\n\nA cloud is a visible mass of condensed droplets or ice crystals suspended in the atmosphere above the surface of the Earth or another planetary body. The branch of meteorology that studies clouds is nephology.\n\nOn Earth, the condensing substance is water vapor, which forms small droplets of water (typically 0.01 mm of ice crystals) that, when surrounded with billions of other droplets or crystals, are visible as clouds. Clouds reflect all visible wavelengths of light equally and are usually white, but they can appear grey or even black if they are so thick or dense that sunlight cannot pass through.\nContents\n[hide]\n\n    * 1 Cloud formation and properties\n          o 1.1 "Hot Ice" and "Ice Memory" in cloud formation\n    * 2 Cloud classification\n          o 2.1 High clouds (Family A)\n          o 2.2 Middle clouds (Family B)\n          o 2.3 Low clouds (Family C)\n          o 2.4 Vertical clouds (Family D)\n          o 2.5 Other clouds\n          o 2.6 Cloud fields\n    * 3 Colors of clouds\n    * 4 Global dimming\n    * 5 Global brightening\n    * 6 Clouds on other planets\n    * 7 See also\n    * 8 External links\n\n[edit]\n\nCloud formation and properties\nA variety of cloud formations.\nEnlarge\nA variety of cloud formations.\nGlobal scheme of cloud optical thickness.\nEnlarge\nGlobal scheme of cloud optical thickness.\n\nClouds form when the invisible water vapor in the air condenses into visible water droplets or ice crystals. This can happen in three ways.\n\n1. The air is cooled below its saturation point. This happens when the air comes in contact with a cold surface or a surface that is cooling by radiation, or the air is cooled by adiabatic expansion (rising). This can happen\n\n    * along warm and cold fronts (frontal lift),\n    * where air flows up the side of a mountain and cools as it rises higher into the atmosphere (orographic lift),\n    * by the convection caused by the warming of a surface by insolation (diurnal heating),\n    * when warm air blows over a colder surface such as a cool body of water.\n\n2. Clouds can be formed when two air masses below saturation point mix. Examples are breath on a cold day, aircraft contrails, and Arctic sea smoke.\n\n3. The air stays the same temperature but absorbs more water vapor into it until it reaches saturation.\n\nThe water in a typical cloud can have a mass of up to several million tonnes. However the volume of a cloud is correspondingly high, and the net density of the relatively warm air holding the droplets is low enough that air currents below and within the cloud are capable of keep it suspended. As well, conditions inside a cloud are not static: water droplets are constantly forming and re-evaporating. A typical cloud droplet has a radius on the order of 1 x 10-5 m and a terminal velocity of about 1-2 cm/s. This give these droplets plenty of time to re-evaporate as they fall into in the warmer air beneath the cloud.\nCumulonimbus cloud\nEnlarge\nCumulonimbus cloud\n\nMost water droplets are formed when water vapor condenses around a condensation nucleus, a tiny particle of smoke, dust, ash, or salt. In supersaturated conditions, water droplets may act as condensation nuclei.\n\nWater droplets large enough to fall to the ground are produced in two ways. The most important is through the Bergeron Process, theorized by Tor Bergeron, in which supercooled water droplets and ice crystals in a cloud interact to produce the rapid growth of ice crystals, which precipitate from the cloud and melt as they fall. This process typically takes place in clouds with tops cooler than -15°C. The second most important process is the collision and wake capture process, occurring in clouds with warmer tops, in which the collision of rising and falling water droplets produces larger and larger droplets, which are eventually heavy enough to overcome air currents in the cloud and the updraft beneath it and fall as rain. As a droplet f
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In some countries, they spray the top of the clouds ("seed the clouds") with chemicals (AgI or AgCl).  This causes the small water droplets in the cloud to grow, and finally the drops are big and heavy enough to fall to the ground in the form of rain.\n\nThe reason for doing this could be that you really don't want rain in a certain area, and you think it is a better idea to make the potential rain clouds "release the rain" in another area, before they have moved with the wind to the area you want to protect.\n\nSo, the rain is not really artificial, but the cause of the rain is artificial.
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None of the above.  The amount of moisture in an air mass is relative.  "Very little moisture" tells us nothing about the temperature, dew point or stability of an air mass which are the determining factors for cloud formation.
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the clouds from the sky helps regulate the temperatures.
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There are three main cloud types.\n\nCumulus clouds are the puffy clouds that look like puffs of cotton. Cumulus clouds that do not get very tall are indicators of fair weather. If they do grow tall, they can turn into thunderstorms. The bottom of cumulus clouds are fairly close to the ground.\n\nStratus clouds look like flat sheets of clouds. These clouds can mean an overcast day or steady rain. They may stay in one place for several days.\n\nCirrus clouds are high feathery clouds. They are up so high they are actually made up of ice particles. They are indicators of fair weather when they are scattered in a clear blue sky.\n\nNimbus is another word associated with clouds. Adding "nimbus" means precipitation is falling from the cloud.\n\nCumulonimbus clouds are the "thunderheads" that can be seen on a warm summer day and can bring strong winds, hail, and rain.\n\nNimbostratus clouds will bring a long steady rain.
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As air rises to get over the mountain, it cools.  Cooler air can't carry as much water vapor as warmer air, so cloud droplets form.
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Storms are created when a center of low pressure develops, with a system of high pressure surrounding it. This combination of opposing forces can create winds and result in the formation of storm clouds, such as the cumulonimbus. Small, localized areas of low pressure can form from hot air rising off hot ground, resulting in smaller disturbances such as dust devils and whirlwinds.
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For weather you need hot and cold, wind and rain, snow and ice, and sunshine. The earth has plenty of those, and our weather is a world-wide heat-engine driven by the sun, the rotation of the earth, and the tilt of the earth's rotation axis with respect to its orbital plane as it orbits the sun. Thus we get night and day (hot and cold), seasons (rain, snow and ice), and cloudy or sunny days (and cloudy nights too, but it's hard to see clouds at night; and the Moon provides us with somewhat "sunny" nights a few nights every month).\n\nThe moon has plenty of hot and cold and sunshine, so some "weathering" of its surface does occur over billions of years of time, due to heat expansion and cold contraction of "stuff" on its surface. But without wind (no atmosphere) and rain, snow, and ice (no water) there is nothing to cause real weather like we have here on earth.
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In the clouds as water vapor.
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These are the cloud types:\n\nHigh-Level Clouds\nCloud types include: cirrus and cirrostratus.\n\nMid-Level Clouds\nCloud types include: altocumulus, altostratus.\n\nLow-Level Clouds\nCloud types include: nimbostratus and stratocumulus.\n\nClouds with Vertical Development\nCloud types include: fair weather cumulus and cumulonimbus.\n\nOther Cloud Types\nCloud types include: contrails, billow clouds, mammatus, orographic and pileus clouds.
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Cloud reading is a fascinating hobby, and a life-saving ability for sailors, mountain climbers and others who find themselves in the wide open spaces. \nYou need to learn about basic kinds of clouds -- the various types of cumulus clouds,for example -- and how they react in your geographical area. Clouds interact with mountains and with water. They load up when they travel over a body of water (the ocean, a lake, etc.) and when they meet a mountain they have to rise to go over it. So, they drop their water. That gives you rain on one side of the mountain and dry conditions on the other side. \nA good place to learn about clouds is from your local weather center (check the nearest airport for the meteorological station closest to you) or you might even give your local TV weatherman a call.
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The first thing to come to my mind is if you're talking about convective rainfall, which requires the ground to heat up.  If you have a layer of say altostratus clouds (with no precip) move over an area, the solar heating will decrease and this could halt any convective clouds that may have been forming, and which may have produced rain if the heating had continued.  But this is just off the top of my head.