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Hello,
The very front of the car (the grill and bumper) is a high pressure zone, and it deflects much of the air flow up and over much of the hood; making the hood a low(er) pressure zone than the front. On my xA, which has the hood sloped down, this is still the case. The upper half of the windshield is also high pressure; but the base of the windshield is a low(er) pressure zone, as well.
The reason I know this the case on my car anyway, is when there is loose (light and fluffy) snow around the windshield wipers, it stays put; unless there is a gust of wind from the side.
In any case, the back of the hood/base of the windshield is a lower pressure zone than under the car. There are other threads that quote aerodynamic reference books showing that intake down low on the front and the exhaust on the back of the hood is the most efficient way to move air through a front radiator.
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