01
Aviation meteorology
Buys Ballot’s Law
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Note
The rule
Northern hemisphere, wind at your back → low on your left. Southern → on your right.
The terrain
Height is pressure, so L is a valley and H a hill. Under the gradient alone the air would roll straight into the valley. Coriolis turns it until it runs almost along the contours — which is why the flow circles the valley instead of filling it.
Keys
←→ move the low · H hemisphere · P panel.