reply to post by 911stinks
And, so are cumulus clouds. And stratocumulus. And fractocumulus. And altostratus. Etc.
Water vapor. Higher altitudes, and it's more ice particles, because of the temperatures.
Has anyone here ever seen it rain? Seen dark storm clouds appear, build, lightning flash? Ever wonder what causes that? (Hint: Not some demons or
'gods' in the sky...)
Hurricanes...Cyclones (same thing, different hemisphere). Natural occurences. Been happening even before MAN existed....
ALL of these are natural occurences. Clouds form, in nature, BECAUSE there are always some sort of dust particle, some sort of naturally-occuring
item, even if microcopic, that forms the nucleus of each droplet.
In engine exhaust (if autobobiles diesel trucks could fly, THEY would form contrails too) there are tiny particles. Called pollution
In major metropolitan areas it has been dubbed with a made-up word, now commonplace --- "smog".
Smog, by itself, is bad enough, and not always
man-made. For instance, even in ancient languages of native Americans, pre-industrial
era, who lived in the Los Angeles, California "basin" area, they referred to the skies being clouded, 'smoky',
The name given by the Chumash tribe of Native Americans for the area now known as Los Angeles translates to "the valley of smoke". because of
the smog from native campfires. Owing to geography, heavy reliance on automobiles, and the Los Angeles/Long Beach port complex, Los Angeles suffers
from air pollution in the form of smog. The Los Angeles Basin and the San Fernando Valley are susceptible to atmospheric inversion, which holds in the
exhausts from road vehicles, airplanes, locomotives, shipping, manufacturing, and other sources.
Just for example...and to show HOW such conditions have existed well before airplanes ever existed.
The word "smog
" is a mash-up of the two words 'smoke' and 'fog'.
What is fog? Well, according to historical records, I would think that London qualifies as one of the foggiest cities on Earth. What causes fog?
Some of it is due to Human pollution, of course. BUT, fog existed well before the industrial age, too.
FOG is, essentially, clouds
. Stratus, specifically, that happens to be lying on the ground.
Fog is a cloud that is in contact with the ground. A cloud may be considered partly fog; for example, the part of a cloud that is
suspended in the air above the ground is not considered fog, whereas the part of the cloud that comes in contact with higher ground is considered
Fog is distinguished from mist only by its density, as expressed in the resulting decrease in visibility: Fog reduces visibility to less than 1 km,
whereas mist reduces visibility to no less than 1 km but less than 2 km. For aviation purposes in the UK, a visibility of less than 2 km but greater
than 999 m is considered to be mist if the relative humidity is 95% or greater - below 95% haze is reported.
The foggiest place in the world is the Grand Banks off the island of Newfoundland, the meeting place of the cold Labrador Current from the north and
the much warmer Gulf Stream from the south. Some of the foggiest land areas in the world include Point Reyes, California and Argentia, Newfoundland
and Labrador, each with over 200 foggy days per year.
No mention of London, but oh well. Still, London does
have that reputation, even if underserved.
Fog forms when the difference between temperature and dew point is generally less than 2.5 °C or 4 °F.
Fog begins to form when water vapor condenses into tiny liquid water droplets in the air. Conversely, water vapor is formed by the evaporation
of liquid water or by the sublimation of ice. Since water vapor is colorless, it is actually the small liquid water droplets that are
condensed from it that make water suspended in the atmosphere visible in the form of fog or any other type of cloud
Contrails, formed by the interaction of the hot exhaust gases from jet engines as the airplanes traverse within airmasses with suitable humidity
levels, are composed of ICE, mostly. The ONLY "chemicals" in them are from the result of hydrocarbon-based fuel combustion. The by-products of
internal combustion engines (and, yes...even a jet engine is considered 'internal combustion').
THAT, my friends, is the science.
The "chemtrail" websites? NOT science. Not even close....
[edit on 24 April 2010 by weedwhacker]