Every single time there is an approaching weather front.
Perhaps it is just the specific conditions of the atmosphere at that altitude, but man, these plane contrails (chemtrails) are consistently intersecting the sky on days of inclement weather. Not a beat missed.. ever.
Trails extending for miles and miles cutting through what appears to be natural forming Cirrus clouds, specifically Cirrus Uncinus formations.
The chemtrails can be seen expanding to great widths in these photos taken with my Iphone SE, before the entire sky was blanketed in a white haze of low hanging Stratus clouds, perhaps aided in formation by the chemtrails nucleation site addition.
These photos shot before the gym on Saturday Morning.
These photos below were shot after the gym on Saturday, just an hour or so later..