Why 'Chemtrails' form a grid pattern

It's often been argued that the criss-cross or grid-like pattern produced by aircraft contrails cannot be normal and is evidence they are chemtrails.

The BBC are (as I write) showing a TV programme called 'Britain from Above' which, in one segment, shows a simulation of all the commercial air traffic that crosses Britain every single day (7,500 aircraft a day)

You can watch the relevant section here:

www.bbc.co.uk...

Looks like normal commercial air routes form a pretty good grid across some of the most populated parts of the country.

Be great to see a similar thing for the USA!

[edit on 10-8-2008 by Essan]

People like to claim contrails are just harmless water vapor.

If that is the case, explain how the harmless water vapor, a
set amount, expands into a nearly infinite amount.

If that were the case, a bank of fog could expand to cover the
entire planet.

Someone show me the physics that allows a set amount of
water vapor expand to cover the entire sky in a nearly infinite
amount of water vapor.

I took the following picture on a day when the temperature at 8000 ft was
92 deg F and the relative humidity was around 15%.

Are you telling me that the difference between 8000ft and 30000ft was
137f and 80% RH. Conditions for contrails to form around -45f and 80-100% RH

reply to post by Manasseh

Source

For a contrail to form, suitable conditions must occur immediately behind a jet engine in the expanding engine exhaust plume. A contrail will form if, as exhaust gases cool and mix with surrounding air, the humidity becomes high
enough (or, equivalently, the air temperature becomes low enough) for liquid water condensation to occur. The level of humidity reached depends on the amount of water present in the surrounding air, the temperature of the surrounding air, and the amount of water and heat emitted in the exhaust.

Atmospheric temperature and humidity at any given location undergo natural daily and seasonal variations and hence, are not always suitable for the formation of contrails. If sufficient humidity occurs in the exhaust plume, water condenses on particles to form liquid droplets. As the exhaust air
cools due to mixing with the cold local air, the newly formed droplets rapidly freeze and form ice particles that make up a contrail. Thus, the surrounding atmosphere’s conditions determine to a large extent whether or not a contrail will form after an aircraft’s passage. Because the basic processes
are very well understood, contrail formation for a given aircraft flight can be accurately predicted if atmospheric temperature and humidity conditions are known.

After the initial formation of ice, a contrail evolves in one of two ways, again depending on the surrounding atmosphere’s humidity. If the humidity is low (below the conditions for ice condensation to occur), the contrail will be short-lived. Newly formed ice particles will quickly evaporate as exhaust gases are completely mixed into the surrounding atmosphere. The resulting
line-shaped contrail will extend only a short distance behind the aircraft.

If the humidity is high (greater than that needed for ice condensation to occur), the contrail will be persistent. Newly formed ice particles will continue to grow in size by taking water from the surrounding atmosphere. The resulting line-shaped contrail extends for large distances behind an aircraft . Persistent contrails can last for hours while growing to several
kilometers in width and 200 to 400 meters in height.

Contrails spread because of air turbulence created by the passage of aircraft, differences in wind speed along the flight track, and possibly through effects of solar heating.

The subject has been studied by a lot of people for a very long time.

However, I didn't start this thread to discuss chemtrails per se, just the fact that normal aircraft flight paths produce the grid-like patterns which some believe are evidence of deliberate chemtrail spraying.

Originally posted by Manasseh

Are you telling me that the difference between 8000ft and 30000ft was
137f and 80% RH. Conditions for contrails to form around -45f and 80-100% RH

Yes.

This is a typical atmospheric sounding from Fort Worth, Texas, today.

You'll see that at ground level the temperature was 28.4c (83f) with RH 58% and at 9144m (30,000ft) it was -53.1c (-64f) with RH 6%

(obviously, you can equally have low RH and gfround level and high RH at 30,000ft)

Contrails would not have been visible above Fort Worth today.

Chemtrails - If you have ever doubted, You won't after this
www.youtube.com...




also heal yourself...
www.bbsradio.com...


curezone.com...