what are the streaks of clouds left behind an  jet airplane?
80699
They're called contrails, short for condensation trails. When a jet engine is running it heats up the air traveling through it.  On the ground it's not that noticeable.  Up in the atmosphere where jets fly, the temperature is way below freezing. The warm moist air condenses as it exits the jet engines and you can see the water vapor the same way you can see your breath on a cold day.
295182
I suspect you are speaking of a contrail. There are two sources.\n\n1. The exhaust of a jet engine is very hot and can hold a great deal of moisture as it cools however the moisture condenses out and produces a "cloud"\n\n2. As a jet passes through the air areas of high and low pressure are created as these areas created or normalise a condenstaion cloud can be produced.
1170985
condensation of the jet's exhaust.
112412
Hard to say form such a vague descrition. As omegawulf666 says, they could be jet contrails if you are only seeing one at a time. \n\nOr you could be referring to radiatus clouds, which form multiple parallell lines (although they often seem to converge on the horizons, like train tracks).\n\nThe one thing they defintitely are not are jet streams. A jet stream is a type of wind. You can't see wind.
36446
A cloud is a visible body of very fine water droplets or ice particles suspended in the atmosphere at altitudes ranging up to several miles above sea level.
249475
Clouds are flat on the bottom because of the condensation level. There is a point as you climb in altitude (not always the same) where the moist rising air reaches the dew point (saturation point) and condenses onto tiny particulate matter in the air. It's nearly flat looking because of the temperature change as you climb is nearly parallel to the ground. Sort of even. Not quite.
1039578
Its because of the Jet Stream.
776377
Contrails are condensation trails (sometimes vapour trails): artificial cirrus clouds made by the exhaust of aircraft engines or wingtip vortices which precipitate a stream of tiny ice crystals in moist, frigid upper air. Contrary to appearances, they are not air pollution as such, though might be considered visual pollution.
573503
its cone shaped like an airplane or jet
674551
it depends on what kind of weather map you are looking at. some show warm/cold fronts, some show rain, some temperature, and others just show the clouds in the atmosphere.
839960
Short answer: the jet stream that covers the continental US.\n\nTemperature and moisture content in these two regions determines how low the jet stream is going to go.  If there is a low pressure system over the Gulf of Mexico, the jet stream is further south -- causing cooler arctic air from Canada to decend into Ohio.  The Pacific Ocean is big contributor of the moisture content -- which is why we see a lot of snow in the Colorado and Montana.  Put the two together and you have a nice combination for snow in Ohio.
25218
Stealth jets, especially the F-117 use a special radar anti-reflective coating and sharp angles to deflect radar signals making them hard to detect on radar and you can't find something if you can't detect it, unless you have a ground spotter calling in coordinates but by the time it is called in the jet has already flown over.  The engine on a stealth jet are also designed to minimize heat exhaust and run cooler than your average jet engine, again, making it hard for heat tracking missiles to lock on.  The skin of a stealth jet, namely the F-117 make it very unstable and requires almost complete computer control during flight, though the pilot can make manual course corrections, it's stability during flight is maintained by a computer without the computer the jet would be too unstable for a human to fly.\n\nThey are stealth to some extent and they mostly fly at night, also, rain somewhat dulls the effects of the special coating and sharp angles of the plane so they typically fly at night in either cloudy or clear skies and in those conditions, they are very, very hard to find.  A F-117 appears to a radar, if it sees it at all to be a small bird like a seagull.\n\nDon't ask what the coating is made of, it is classified.
166511
The process, called air seeding, involves a plane flying over an existing cloud and spraying a chemical that results in the premature ejaculation of rain.  This process is utilized when an area is facing drought and needs rainfall.
725440
what you see on the cirrus clouds (the streaks, or tails) and slowly fading away is actually snow. blown byt the winds =)
454900
Well you see, not all clouds are the same: Here are some different types of clouds, that don't rain at all.\n\nCirrus Clouds\nCirrus clouds are the most common of the high clouds. They are composed of ice and are thin, wispy clouds blown in high winds into long streamers. Cirrus clouds are usually white and predict fair to pleasant weather. By watching the movement of cirrus clouds you can tell from which direction weather is approaching. When you see cirrus clouds, it usually indicates that a change in the weather will occur within 24 hours.\n\n\nCirrostratus clouds are thin, sheetlike high clouds that often cover the entire sky. They are so thin that the sun and moon can be seen through them. Cirrostratus clouds usually come 12-24 hours before a rain or snow storm.\n\n\nCirrocumulus clouds appear as small, rounded white puffs that appear in long rows. The small ripples in the cirrocumulus clouds sometime resemble the scales of a fish. Cirrocumulus clouds are usually seen in the winter and indicate fair, but cold weather. In tropical regions, they may indicate an approaching hurricane.\n\n\n"Alto" Clouds\nAltostratus clouds are gray or blue-gray mid level clouds composed of ice crystals and water droplets. The clouds usually cover the entire sky. In the thinner areas of the clouds, the sun may be dimly visible as a round disk. Altostratus clouds often form ahead of storms with continuous rain or snow.\n \n\nAltocumulus clouds are mid level clouds that are made of water droplets and appear as gray puffy masses. They usually form in groups. If you see altocumulus clouds on a warm, sticky morning, be prepared to see thunderstorms late in the afternoon.\n\n\nStratus Clouds\nStratus clouds are uniform grayish clouds that often cover the entire sky. They resemble fog that doesn't reach the ground. Light mist or drizzle sometimes falls out of these clouds.\n \n\nStratocumulus clouds are low, puffy and gray. Most form in rows with blue sky visible in between them. Rain rarely occurs with stratocumulus clouds, however, they can turn into nimbostratus clouds.\n\n\nNimbostratus clouds form a dark gray, wet looking cloudy layer associated with continuously falling rain or snow. They often produce precipitation that is usually light to moderate.\n\n\nCumulus Clouds\nCumulus clouds are white, puffy clouds that look like pieces of floating cotton. Cumulus clouds are often called "fair-weather clouds". The base of each cloud it flat and the top of each cloud has rounded towers. When the top of the cumulus clouds resemble the head of a cauliflower, it is called cumulus congestus or towering cumulus. These clouds grow upward and they can develop into giant cumulonimbus clouds, which are thunderstorm clouds.\n\n\nCumulonimbus clouds are thunderstorm clouds. High winds can flatten the top of the cloud into an anvil-like shape. Cumulonimbus clouds are associated with heavy rain, snow, hail, lightning and even tornadoes. The anvil usually points in the direction the storm is moving.\n \n\nSpecial Clouds\nMammatus clouds are low hanging bulges that droop from cumulonimbus clouds. Mammatus clouds are usually associated with severe weather.\n\n\nLenticular clouds are caused by a wave wind pattern created by the mountains. They look like discs or flying saucers that form near mountains.\n\n\nFog is a cloud on the ground. It is composed of billions of tiny water droplets floating in the air. Fog exists if the atmospheric visibility near the Earth's surface is reduced to 1 kilometer or less.\n\nContrails are condensation trails left behind jet aircrafts. Contrails form when hot humid air from jet exhaust mixes with environmental air of low vapor pressure and low temperature. The mixing is a result of turbulence generated by the engine exhaust.\n\nhope this helps :-).
294528
A cirrus cloud is a type of cloud comprised of ice crystals and characterized by thin, wisplike strands, often accompanied by tufts. Sometimes these wispy clouds are so extensive that they are virtually indistinguishable from one another, forming a veil or sheet called "cirrostratus". Sometimes convection at high altitudes produces another form of cirrus called "cirrocumulus" a pattern of small cloud tufts. The name "cirrus" is derived from a Latin word meaning "wisp of hair."\n\nMany cirrus clouds produce hairlike filaments made of snowflakes or heavier ice crystals that precipitate from them. These "fall streaks", a form of virga, often indicate the difference in the motion of air (wind shear) between the upper part of the cirrus cloud and the air below it. Sometimes the top of the cirrus cloud is moving rapidly above a slower layer of air, or the streak is falling into a faster moving lower layer. The directions of these winds can also vary.\n\nCirrus usually form at altitudes above 5000 meters (16,000 feet). The fall streaks may appear straight when wind shear is absent, giving the clouds the appearance of a comma (cirrus uncinus), or tangled, an indication of high-level turbulence. The snowflakes or ice crystals evaporate before reaching the ground.
1029122
Cumulus: White fluffy one that look like floating sheep- warm air rises fast and is cooled fast.\n\nCirrus: Light wispy clouds that look like feathers or curls of hair- Formed really high in the sky and where it is cold. They contain only ice crystals.\n\nNimbostratus: Dark clouds that hang low. They are true rain and snow clouds.\n\nCumulonimbus: White fluffy clouds with dark bottoms. Winds often flatten out their tops. These are storm clouds that give us thunder, lightning and tornadoes.\n\nStratus: Thick clouds which are layered.  They hang low and often dull grey in color.