BobR wrote:
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The same mechanism also works with the ridge vents if there is wind.
The wind blowing against the roof will be forced up and over the roof
resulting in a low pressure zone on the back side of the roof. This
low pressure zone will draw the air up and out of the ridge vent even
more effectively than the wind turbine. So the result is that ridge
vents are not totally dependent on convection currents.

There are at least two exceptions.

1. If the wind is blowing parallel to the ridge vent, no suction.

2. If the wind is blowing perpendicular to the ridge vent, as much (or more)
is blown INTO the ridge vent as is sucked out.

All in all, I suspect it's a push regarding wind and ridge vents.