Open Show n' Tell 2016

Do you think that is true ?

Nope, you aren't keeping that a secret. How long contrails last is dependent upon conditions in the atmosphere such as temperature, humidity and wind sheer. Commercial aviation routes will give you that grid-like pattern on days when atmospheric conditions favor contrails sticking around, widening like cirrus clouds and actually forming together in one big hazy cloud. It's ice and nothing sinister IMHO.
 
Nope, you aren't keeping that a secret. How long contrails last is dependent upon conditions in the atmosphere such as temperature, humidity and wind sheer. Commercial aviation routes will give you that grid-like pattern on days when atmospheric conditions favor contrails sticking around, widening like cirrus clouds and actually forming together in one big hazy cloud. It's ice and nothing sinister IMHO.
No its not like they got something called HAARP that changes the weather.
 
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