I've been reading nature books lately, since I'm spending the summer in the woods and want to figure out what's around me. In one, I read a description of how the low pressure in a tornado "sucks things in." Another mentioned that "nature abhors a vacuum."
But comparatively low pressure does not exert any sort of force on anything at all. After all, it's low pressure. This was an ancient error -- "nature abhors a vacuum" comes from the middle ages -- and was refuted by Pascal in a famous experiment. There is no "pull" from a vacuum or low pressure system -- there is a "push" from the higher pressure around it. That is why mercury does not rise as high in an evacuated tube on a mountaintop as it does at sea level -- the vacuum is the same in both cases, so if it "pulled," the mercury should go just as high in both places. It doesn't, because there is more air pushing it up at sea level.