Every streamline filament is isoenergetic.They all contain identical energy as a function of pressure and velocity.
Daniel Bernoulli discovered that as the streamlines played over a body,that they might accelerate to a higher velocity/while simultaneously losing static pressure (as compared to the local barometric pressure measured at an aerodynamic 'infinity' distance),or visa versa;when decelerating after passing the body (barring any separation).
Any combination of velocity and pressure always added up to unity.
The snow phenomenon adds at least a magnitude of complexity,since the snow has a lot more mass/inertia than the air it's entrained in,allowing the air can go places where the snow can't without actually colliding with the obstruction,maybe adhering,maybe not.Powdery snow would easily erode,wetter snow might not.Melting and re-freezing would complicate the hell out of the situation.
