Notice the banding in the stable layer that must be perpendicular to the wind direction. If you watch the motion of these gravity wave clouds, you can discern where the col of the deformation zone must be. If the gravity waves are moving progressively downstream (generally eastward) the col must be upstream of your location. Conversely if the gravity waves are stationary or moving even upstream (generally westward) to you location on the ground, the col must lie downstream. The trick is to determine the wind direction in the atmosphere relative to the mean or average motion of the clouds comprising the warm conveyor belt. This analysis might take some time and more than one beverage. Good luck!