reply to post by JonInMichigan
You're almost there, Jon...keeping your mind open to the science
...careful you don't let the hucksters fool
you, with their nonsense.
...the airline traffic patterns very plausible and that we have a traffic pattern from east-west coming out of Detroit.
I see this misunderstanding often, and the post where you showed the airports, on a map? Irrelevant.
Air traffic arriving/departing, and therefore below ~25,000 feet, will NOT make a contrail. Their exhaust gases simply won't be visible. We are
seeing, in your photos, airplanes that are just passing by
, at altitude, to coming/going somewhere else besides your local airports.
These were going east-west and angled back towards the airport so that says something. They would to have been really high and the
atmosphere would have to be just right for these lines to persist for so long.
Did you look at the skyvector.com
site yet? The "angled back" isn't relevant...you have airplanes flying routes, to different
destinations...you can see some of the contrails indicate slight turns....course corrections. Some airplanes, depending on destination, made turns
one way, others another way. Take a look at skyvector
. Keep in mind that the airplanes ALSO do not always follow the Jet Airways
exactly....some are granted (by ATC) more 'direct' routing, occasionally.
But, the last part of the above is spot on correct....the atmosphere, at altitude WAS "just right".
... “why were they all at the same height and evenly spaced???” ...
Well, really...they aren't at the same altitude...not ALL of them. Some can be, as airplanes may be at same altitude, same direction "in trail"
with each other...minimum horizontal separation, at those altitudes, is 20 miles. They are traveling at between seven and eight miles per minute
(less if into a headwind, faster if flying WITH the wind).
So, you can see...as to "persistence"?? Quite a few contrails can be made within the span of just an hour, or so....certainly, if clouds can last
awhile, then contrails can, too. They are just a form of high altitude clouds, after all.....shaped artificially, by airplanes.