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Buys Ballot's Law
13 April 2020 · 6 min · 7K views
What this video covers
Buys Ballot's Law provides a method for locating the center of a low-pressure system while at sea.Watch In the Northern Hemisphere, a sailor standing with their back to the wind should extend both arms; the center of the low-pressure system lies approximately 20 degrees forward of the left hand.0:15 This 20-degree offset accounts for surface friction, which causes wind to flow slightly inward toward the low rather than moving tangentially along the isobars.Watch In the Southern Hemisphere, the low-pressure center is located 20 degrees forward of the right hand.0:52 Understanding this orientation allows sailors to navigate away from or toward stronger winds during storms or ocean races.1:09 While highly accurate in open ocean conditions, the rule may be less precise in the Mediterranean due to complex orographic influences.4:08 Steering toward the right in the Northern Hemisphere generally leads to milder conditions, while steering toward the left moves the vessel into higher wind speeds and increased risk.0:52
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