Is this a altostratus cloud?
103208
Yes. See the cloud types shown here --- http://www.ccrc.sr.unh.edu/~stm/AS/Weather_Toolbox/Cloud_Classification.html\n\nAltostratus is about half-way down the page
833749
Clouds are water vapor. Think of it like a pocket of fog in the sky.
1053532
it was blue with clouds in it.
195502
I did a Yahoo Search for:\nflat cloud bottom\nhttp://search.yahoo.com/search?ei=utf-8&fr=slv1-&p=flat%20cloud%20bottom\n\nand I found this page which is from a sight call "Ask A Scientist" where they answer this very question:\nhttp://www.newton.dep.anl.gov/askasci/wea00/wea00041.htm\n\nThe answers aren't great, but it seems to do with level at which water vapor begins to condense into cloud forming water droplets.  It depends on the temperature or air pressure.  The reason the bottoms of some clouds look flat is that these conditions are pretty uniform over a large area.  As you go higher up, temperature and pressure decrease and the transition point is a fairly consistent altitude for that moment in time.\n\nFor more information on clouds and cloud types:\nhttp://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/home.rxml
110572
In 1896 the International Cloud Atlas was published.  It listed 10 diferent kinds of clouds.  Cloud #9 was cumulo-nimbus, which is the highest type of cloud there is.\n\nHope this helps :-)
1156612
Water vapour is a colourless, transparent gas - so clouds are quite clearly not made of it.\n\nClouds are indeed made of small drops of water. They stay up becaus of convection. Clouds can only be stable where there is an updraft to counter the slow drift down of the water droplets under gravity. \n\nThere are two basic types - stratiform which are stable and supported by a constant updraft and convective in which you can actually see the churning effect of convection if you look.
658585
i'm not sure of what it is
985716
Belinda S You are on the big news!!…\nhttp://www.osoq.com/funstuff/extra/extra04.asp?strName=Belinda_S
1152448
No, this is a hoax;  check http://www.snopes.com/inboxer/hoaxes/overload.asp
405749
Is it VERTICAL HORIZON - Famous
1061413
I don't know but I have seen some weird stuff in the sky. I saw this light go back and forth very fast a couple of times then disappear straight up into the sky. I also used to see these weird upside down arch shape clouds in the sky just barely moving. Bonafide Alien Space Craft or Aerial Government Experiment, I don't know.
1106810
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.
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.
1045293
Is this it: http://www.mcdougallittell.com/ml/la.htm;jsessionid=GHkPLpvQMcS8nZQ2y93xRVgvnpHyLXcH8Zn3X3NLJ0GWMf1N81vS!-868249644?lvl=4&ID=1006100000013518# ?
438834
If you mean an official spaceship or saucer, well...no. \n\nBut if you mean "Unidentified Flying Object," then I did see a triangular shape (three dull orange lights) flying very, VERY fast across the horizon of Utah once. I learned later it might have been a stealth bomber moving from one base to another, but MAN that thing was quick. It's exact identity was never confirmed.
945431
Visit:explorer.altopix.com
896477
Not sure if this is the one....;