well cold and low are relative, but colder air is denser, therefor heavier, therefore higher pressure. Of course, denser air sinks, so at some level a high pressure on the ground is equal top a low pressure aloft, but we're talking relative, right... in At Sci we used the 500MB level as the mid elevation...when you have an 8000m mountain poking up it tends to be a high "ground level' and you dont get the same amount of sink you do over an 8000m column of air with bottom at sea level, which is why when a high pressure system hits in the mountains, your barometer goes up (apparent elevation drops) even at high elevation.
weather