Sharp boundary between contrails and clear sky

Trailblazer

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

IMG_1526.JPG

...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:

IMG_1559.JPG

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:

IMG_1572.JPG
 
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