Sharp boundary between contrails and clear sky

Trailblazer

Moderator
Staff member
Early this morning the sky was clear but shortly before 9am contrails started persisting in places:

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...which turned into...

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All the contrails started appearing along one line roughly parallel to my northwest-facing window. Soon the sky was well covered with a grid of contrails while beyond the line, to the west, stayed clear:

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The boundary between clear sky and contrails is gradually getting further away to the west.

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250mb humidity chart for 10am with my approx location marked by the dot.

You_Doodle_2018-05-14T09_19_58Z.jpg


The sky to the east:

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