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The simplest answer is related to aerodynamics, and air pressure. When you open the door, the higher pressure air outside of the car naturally rushes in to equalize the lower pressure inside the car.

Also, when the door is shut, there is air everywhere right up against it. When you open the door, the air is displaced, or pushed, out of the way by the door. Since it has to move somewhere when it is pushed by the door, it wraps around the door to the lower pressure area created on the backside of the door as it moves and creates a place void of air on the other side.

To visualize this effect, you can do your own experiment. Fill a clear container with water. Then, put something flat down into the water vertically (standing up). Next, move the object sideways across the water, watching the edges. You should see the water wrapping around the edges, filling in behind the object. That is the same effect.

The snow just happens to be an innocent bystander that gets carried in by the moving air.

The third, and most obvious reason is...you forgot to clean the snow off of your car before you opened the door!

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16y ago

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