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So in Colorado you have the Colorado Front Range and the Palmer Divide. In Canada, in Alberta you have the Canadian Rocky Mountains and the foothills. In the DCVZ you have ambient low level easterly or self-easily winds and they hit the elevated Palmer Divide and they're basically forced to deflect. In Alberta you have the same ambient low level easterly or self-easily winds and they push up slope towards the Rockies and pool along the elevated foothills. Then you have this wind shear line that develops in both cases. In Denver it's basically deflected easterly air that collides with westerly winds rolling down the mountains foothills and this creates a sharp north-south oriented line where you have spinning air so a vorticity. And in Alberta the wind shear line is basically, similarly it's deflected easterly winds that collide with a westerly or north-westerly flow coming off the mountains and this creates a tight localized boundary of surfy winds.