In the Northern Hemisphere, if a person stands with their back to the wind, the atmospheric pressure is low to the left, high to the right.

Buys Ballot's Law

Description

Buys Ballot’s law, the relation of wind direction with the horizontal pressure distribution named for the Dutch meteorologist C.H.D. Buys Ballot, who first stated it in 1857. He derived the law empirically, unaware that it already had been deduced theoretically by the U.S. meteorologist William Ferrel, whose priority Buys Ballot later acknowledged. The relationship states that in the Northern Hemisphere a person who stands facing away from the wind has high pressure on the right and low pressure on the left; in the Southern Hemisphere, the reverse would be true.