According to Buys Ballot's law:
When you stand with your back to the wind in the Northern Hemisphere, low pressure is always to your left. (In the Southern Hemisphere, low-pressure systems will be on your right.)
It implies that geostrophic wind blows in parallel to low and high pressure zone, for example I'm in the Northern Hemisphere, wind blows to my back, low pressure is always to my left and high pressure is always to my right. But I thought that wind always blows from the high pressure zone to the low pressure zone. How this contradiction may be explained?