what are the visual signs of cloud decay and dissolution in a Cumulus cloud?
963304
Ragged edges are the main clue.  They signify a dry atmosphere, which causes the water droplets forming the cloud to evaporate.  Cumulus clouds that are building will have mainly sharp edges, and you may see cirrus-type hoods over the tops, if they are building rapidly.  These hoods are created by pressure as both the cloud mass and the air with it rises rapidly in the atmosphere.  The same phenomenon can be seen on the forward surfaces of the space shuttle as it climbs through moist air and even on forward surfaces of aircraft in flight (as well as behind the wingtips).
385085
Although sightings of these colorful events have been documented in the past, this phenomena has come to the front of geophysical interest in recent times. Red sprites typically extend above the cloud tops up to heights of nearly 95 km. After several imaging campaigns in the central United States during1993 and 1994, there has been an increased demand to explain these naturally-occurring colorful flashes. The VLF group is actively pursuing scientific explanations along with our colleagues in the field. \n\nmore info in\nhttp://www-star.stanford.edu/~vlf/Red_Sprite/
33298
3 things r neede for cloud formation...cooling of air, presence of water vapour (relative humidity shud be close to 100%), and condensation nuclei( like dust particles).\ndunno who found it, sorry
577442
The water vapor which is released through the combustion of the gases becomes like fog and converts to water droplets when cooled in the air. This is just like the clouds
1186923
Clouds are made up of tiny water droplets or ice crystals, usually a mixture of both. The water and ice scatter all light, making clouds appear white. If the clouds get thick enough or high enough all the light above does not make it through, hence the gray or dark look. Also, if there are lots of other clouds around, their shadow can add to the gray or multicolored gray appearance.
818992
Cool - you seem to have really interesting weather.\n\nYes, if there is a 1000 foot difference between you & the town 7 miles away you will certainly experience different weather in some situations - and typing in your zip code for an online forecast generally will not help - to my knowledge the type of meso and micro scale effects you mention are not included in any of them. You really have to learn how your local weather differs from that at surrounding areas (which are forecast for) for specific situations.\n\nFor example, when the temperature is near the dewpoint with storm systems affecting your region, the cloud base in town can be below 1000 feet and below you. There are many orographic effects on the microscale - mountain-valley breezes, and the extra elevation can in certain situations cause showers to occur over you but not them. After a cool & clear night, you may become warm quicker than the town does - cool air persisting in the valleys longer after sunrise - then they'll become quite a bit warmer than you during afternoon.\n\nThough the NWS attempted to place the doppler radars at locations for the best overall coverage, some mountain locations still cause problems. The base reflectivity images you typically see when you look at a "radar map" are obtained using a beam tilted .5° above horizontal. If the precipitation is occurring primarily below that or there is an intervening mountain, you may get a small or no signal. That is much more common with snow rather than rain showers because low & rather thin clouds can sometimes produce them. Raindrops generally need a much greater vertical distance for the water droplets to combine and become large enough to fall out of the cloud. Ice crystals can float around horizontally much more and do that.\n\nSo there are many possibilities, but I would have to know exactly where you are to say anything specific.\n\nI saw something cool visiting Clingman's Dome in Tennessee one September. It was a sunny day, but on the road to the summit there was a large low area in amongst the mountains over which a cumulus cloud had formed. Became cloudy for a few minutes as we passed by then was sunny again. On the way back down a few hours later, the cloud was still there. There were a few small cumulus clouds here & threre occasionally, but some orographic circulation evidently caused that cloud to form & persist much of the day. Was a warm day - I am guessing a little over 80° even at the summit.
492491
Water vapor is transparent (for most purposes) and so mere humidity in the atmosphere can't be a cloud. Since clouds don't have motors keeping them in the air, and yet stay there for hours in some cases, they can't be solid, for if they were, they'd fall out of the sky and we'd find cloud bits laying around on the ground. And the same is true for liquid as well. \n\nSo what's a cloud? Mostly, it's very small bits, so small that air currents can keep them in the air. The bits can be solid (eg, ice crystals of which snowflakes are examples), or liquid (eg, little drops of water, of which rain is an example). In either case, enough of these small things begin to look white as light passes thorough them and is reflected and refracted and generally diverted. Kind of like the effect of fine particulate suspensions in water. They are sometimes referred to as milky looking. Indeed, milk is white for a similar reason.\n\nThese are usually formed around dust bits, for real. High humidity (forced by cooling temperatures) produces supercooling (ie, ready to condense, if a trigger can be found). The dust motes provides the trigger. With updraft winds, a condensed drop can grow pretty large. And if it goes high enough, and gets cold enough, the drop can freeze (and thus make hail). If the orignal condensation is sufficiently cold, then water will be added to an ice crystal. With the proper history, such crystals become snowflakes.
636418
The main types of clounds are cumulus, stratus, cirrus, and nimbus.  The page below has explanations of these words and pictures of the different types.
619362
It is called a contrail,  condensation trail or vapour trail.\n\nCombustion of airplane fuel generates steam in the exhaust. At high altitudes the cold temperature of the atmosphere causes the steam to condense into water droplet or ice crystals (depending on the temperature). \n\nThe condensed water droplets / ice crystals disperse light, making them visible.
272835
This is not always the case.  The phenomenon you speak of is most associated with cumulus clouds, those you see most in the  spring, summer, and fall, and which also produce the most weather (including tornadoes and the main source of hurricanes).  Cirrus and stratus clouds are generally quite flat or layered in structure and are responsible for most overcast days.  Most aren't very fluffy, though high winds aloft can sometimes cause them to take some pretty interesting shapes.\nCumulus are the "cauliflower" like clouds that form when air from below rises rapidly because its unstable.  Air is unstable when it is warmer than air around it.\nCumulus form when the ground heats up during the day causing the air near it to become unstable or when some "forcing" mechanism like a front causes lift.  The flat base forms when the air rising from below reaches saturation (air cools as it rises, and thus the relative humidity increases until it reaches about 100% when the cloud begins to form).    Because the source air for the cloud is all of about the same moisture and temperature, all of the rising air reaches saturation at the same level (termed the Lifted Condensation Level (LCL), when the air starts rising very near the ground).\n\nBecause the air is still unstable, it continues to rise.  That's why you get these large "towers" that build up, and the quicker they rise, the stronger the storm they produce.  As the air continues to rise, it begins to mix with the surrounding environment and above a certain level (the Equilibrium Level, EL) the air becomes stable (cooler than the environment).  Different pockets of air continue to rise  at different rates, and that causes the fluffy nature nearer the top of these clouds.\n\nCumulus are different from stratus and cirrus because they indicate large vertical motion and have a very distinct structure to them.\n\nBasically you could even think of a cumulus cloud as like blowing a balloon upwards.  The bottom is all at one defined spot, while as the air moves into the balloon, it spreads out.  In a cloud the rising air also mixes in different proportions with the environmental air, causing the unique shapes higher up in the cloud.  Hope that helped.  If it's not clear, let me know! :-)
754776
It measures the density of cumulative clouds. Good Luck !  :)
438824
Where jets fly the atmosphere is very cold and the water vapor from the jets exhaust condenses and freezes into ice crystals.  THat is why you see the contrail, 0r condensation trail.
504229
Cirrus clouds. The puffy ones are cumulus, and dark ones nimbocumulus. The cirrus clouds are really high up.
173251
A cumulonimbus cloud forms in rising air (updraft).  The air cools as it rises, and at a certain point the water vapor in the air condenses into water droplets, forming a cloud.  Around a large Cb there is often downdraft - the air gets warmer as it subsides, and any water droplets (=clouds) will evaporate.
853151
it's pressure and blood flow...  this sensation of course you know soon fades...\n\nthe optical nerve fills with blood while you are pressing on it and that's what it looks like.. normally the blood circulation looks like swirling clouds in your eyes when the lids are shut.\n\n:D
323686
evaporation , condensation
638188
I assume you are titrating against a standard mixture, now in Na2S2O3 the solution will contain Na+ ions which are colourless. However Cu+ and Cu2+ ions which occur in the 2nd case are prone to atmospheric oxidation producing a film of CuO or Cu(OH)2, thus the cloudy appearance.