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originally posted by: Zaphod58
a reply to: EternalShadow
Because there's enough humidity in the air to allow them to. A contrail is basically a man made cirrus cloud. So if the conditions are right for a cirrus cloud to form and persist, then a contrail will as well.
originally posted by: RandomPerson
As Zaphod58 said, it could have been a front that created those crisscross trails, but I’ve never heard of such a thing occurring naturally. Then again, I’m no weather expert so that’s not impossible either.
Further, a flow pattern
analysis identifies typical regions where the occurrence of contrails was above average. These regions are
in the upper atmosphere: (a) ahead of a surface warm front either in moist warm layers before the cirrus
clouds arrive or more likely with the cirrus in a warm conveyor belt and (b) ahead of a surface cold
front in rapidly moving cold air in the turbulent regions near a band of strong wind (though the speed
is not necessarily as high as in a jet). Usually, the atmosphere is baroclinic in the contrail region. Most of
the detected contrails occur in divergent flow patterns in the upper troposphere in slowly rising warm or
locally turbulent cold air masses.
When your Morning Meteorologist utters the words "increasing clouds," chances are you'll see more jet contrails in the day ahead. That's because jet contrails are often produced before incoming weather systems.
Finally, moisture is needed (which is why these occur in advance of low pressure systems). Thunderstorms being produced "upstream" boost water vapor high into the atmosphere which then spreads along jet stream winds. As jet aircraft fly through this high-humidity air, more contrails are formed.
Yes, they're still flying the same flight paths. You can go to the ADS-B Exchange website and track any aircraft with an ADS-B transponder, and you'll see the same flights on the same paths day in and day out.
I always thought that too until I moved to Georgia
It may be a very long time before we know what, if anything, is actually going on in our skies. However, when the CIA, who is responsible for so much turmoil on a global scale, begins talking about geoengineering, we should listen. Please share this story with your friends and family who think it’s only conspiracy nuts who talk about spraying things into the sky. The part of the speech where Brennan talks about geoengineering begins at the 12:05 marker: