Congratulations on your stunningly beautiful Storm Pattern!!! 
These are referred to as “lazy lines”. One can think of them as “hinge” points in the weaving. They’re created when the weaver doesn’t finish a rug line by line from one side to the other, but sequentially finishes one area after the other. In other words, the weaver wove small, vertical sections at a time, rather than full-width rows. They’re functional joints, and allow large looms to be managed efficiently.
From Nizhoni Ranch Gallery…
Lazy lines appear as a diagonal line in the weave of the fabric. During the weaving process, the rug maker would move to work on adjacent sections of the warp, resulting in the subtle diagonal lines referred to as lazy lines.
Note: not every Navajo weaving has visible lazy lines.
Thank you for sharing and congrats again! 
P.S. This would make for a welcome addition to Weavings of the Diné . 