This plane is producing a contrail above me right now. Notice how the vapor dissipates fairly quickly? This is because the humidity at that level is currently quite low. If it was more humid, the trail would stick around for a longer period of time & would maybe even spread out across the sky!
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@ryanhallyall Explain this then. I took this video myself.
@0fFaith @ryanhallyall They're at different altitudes, which means different humidity, which means the contrails last longer or shorter.