posted on Jan, 17 2014 @ 12:59 PM
I'm just curious to know, as to why these planes, flying back and forth, have normal contrails, now?
How come those
"persistent lingering contrails" are not happening??? THIS is WHAT WAS happening, ALL THE TIME; even during 80 degree weather.
THIS IS WHAT'S BEEN GOING ON, in the same temperature, for the past week or so.
Yes, i know that
the temps on the ground are different, than the temps at 30,000 feet; but WHY are there no "persistent lingering contrails"? Shouldn't there be???
Isn't it a bit strange to see "persistent lingering contrails", on a perfectly blue day; when, on a hazy day, these planes are leaving normal
condensation trails? I thought the new jet fuel was making those "persistent lingering contrails"; or was it the effects of global warming, mixed
with the jet fuel that caused them??? Or maybe, those "chemtrails" were made because of an approaching storm front???
What are contrails?
A contrail is the condensation trail that is left behind by a passing jet plane. Contrails are clouds, usually cirrus, formed when water vapor
condenses and freezes around small particles (aerosols) that exist in aircraft exhaust. Some of that water vapor comes from the air around the plane;
and, some is added by the exhaust of the aircraft. The exhaust of an aircraft contains both gas (vapor) and solid particles. Both of these are
important in the formation of contrails. Some elements of the exhaust gasses are not involved in contrail formation but do constitute air pollution.
Emissions include carbon dioxide, water vapor, nitrogen oxides, carbon monoxide, hydrocarbons such as methane, sulfates, and soot and metal
What Conditions Must Be Present for Contrails to Be Formed?
This trail of clouds normally forms at very high altitudes (usually above 26,000
ft) where the air is extremely cold (less than -40ºC). The temperature needed to create contrails depends on the ambient air pressure, temperature
and humidity outside of the aircraft, and on the ratio of water vapor and heat released into the atmosphere by the aircraft exhaust. That is why
sometimes you can see them and sometimes you can’t. This cloud formation is similar to the cloud you see on cold days when you exhale and "see your
In order for a contrail to form, there must be enough moisture in the high levels of the atmosphere for the ice crystals to form around the airplane
exhaust. If the upper atmosphere is very dry, contrails will not easily form, or will be of the short-lived type. Persistent contrails can last for
hours to days, and spread over thousands of square kilometers, becoming indistinguishable from naturally occurring cirrus clouds.
So, what i
should believe is that up until, about a week ago, there was enough moisture in the atmosphere, to form those "persistent lingering contrails"; and
suddenly, there's not??? I find that highly unlikely; especially after seeing those long trails occur, all the time, for 3 years. Very rarely had i
seen "condensation trails", until now. So, what's changed???