[kach22i]

.....was sculpted by a headwind after the fact........

No, not the case.

If you follow the link provided I wrote that we had a snow storm with a near constant 35 mph wind.

The snow just went around the truck like that.

I think this snow accumulation illustrates the built up attachent of air or pressure wave at the front of the truck.

You know, like when Aerohead says just ignore the front part of the Aero-Template, it's just built up air pressure for attachment of the latter part where drag forms.

Where there is no snow, the pressure bubble displaced or moved the snow before it could settle.

Or the velocity increased at the bow and carried the snow away.

My problem when trying to explain it comes to the whole pressure verses velocity thing. The pressure gets lowered when velocity goes up, right?

I don't want to overthink this. My brain just understands what's it is looking at, but the words fail me.