Buys Ballot's law

In meteorology, Buys Ballot's law may be expressed as follows: In the Northern Hemisphere, stand with your back to the wind; the low pressure area will be on your left. This is because wind travels counterclockwise around low pressure zones in the Northern Hemisphere. It is approximately true in the higher latitudes of the Northern Hemisphere, and is reversed in the Southern Hemisphere, but the angle between the pressure gradient force and wind is not a right angle in low latitudes. See Coriolis effect#Flow around a low-pressure area.

This rule, which was first deduced by the American meteorologists J.H. Coffin and William Ferrel, is a direct consequence of Ferrel's law. The law takes its name from C. H. D. Buys Ballot, a Dutch meteorologist, who published it in the Comptes Rendus, November 1857. While William Ferrel theorized this first in 1856, Buys-Ballot was the first to provide an empirical validation.

Buys Ballots law first appeared in early versions (prior to 1900) of Bowditchs' American Practical Navigator http://en.wikipedia.org/wiki/Bowditch%27s_American_Practical_Navigatorand other publications written to assist in passage planning and the safe conduct of ships at sea and is still included today both in Bowditch and in Sailing Directions (see following reference) as an item of practical reference and information. The law outlines general rules of conduct for masters of both sail and steam vessels, to assist them in steering the vessels away from the center and right front (in the Northern Hemisphere and left front in the Southern Hemisphere) quadrants of hurricanes or any other rotating disturbance at sea.

Note that prior to radio, satellite observation and the ability to transmit timely weather information over long distances, the only method a ships master had at his disposal to forecast the weather was observation of meterological conditions (visible cloud formations, wind direction and atmospheric pressure) at his location.

As early as the 1500 s extensive weather observations were included as part of a ships log. These observations as well as other log information, were turned over to national hydrographic institutes in various nations, most notably Germany and England and later the US. The information from many ships about individual voyages was compiled ashore and later became what today is still published by England, a 3 volume set complete with charts titled "Sailing Directions for the World" . Additionally the US Defense Mapping Agency publishes a 47 volume set "Sailing Directions "http://en.wikipedia.org/wiki/Sailing_DirectionsWhich serves much the same purpose. The information is the distillate of empirical observations of thousands of ships masters over thousands of voyages spanning several hundred years. Included are Buys Ballots Law techniques for avoiding the worst part of any rotating storm system at sea using only locally observable phenomena i.e. cloud formations, wind speed and barometric pressure tendencies over a number of hours. These observations and application of the principles of Buys Ballots Law help to establish the probability of the existence of a storm and the best course to steer to try avoid the worst of it--with the best chance of survival.

From a slightly less esoteric standpoint the underlying principles of Buys Ballots Law state that for anyone ashore in the Northern Hemisphere and in the path of a hurricane, the most dangerous place to be is in the right front quadrant of the storm. There, the observed wind speed of the storm is the sum of the speed of wind in the storm circulation plus the velocity of the storms forward movement. Buys Ballots Law calls this the Dangerous Quadrant. Likewise in the left front quadrant of the storm the observed wind is the DIFFERENCE between the storms wind velocity and its forward speed. This is called somewhat euphemistically the Safe Quadrant due to the lower observed wind speeds.

To look at it another way in the Northern Hemisphere if you are to the right of where a hurricane or tropical storm makes landfall that is considered the dangerous quadrant. If you are to the left of the point of landfall that is the safe quadrant.

In the dangerous quadrant an observer will experience higher wind speeds and generally a much higher storm surge due to the wind direction (onshore).

In the Safe quadrant, the observer will experience somewhat lower wind speeds and the possibility of lower than normal water levels due to the direction of the wind being offshore.

These are very general rules that are subject to many other factors i.e. shapes of the coastline, and topography in any location. Although the principles here to a very limited extent apply to a coastal observer during the approach and passage of a storm in any location, Buys Ballots Law was primarily formulated from empirical data to assist ships at sea.

External links

*M. Buys-Ballot, "Note sur le rapport de l'intensité et de la direction du vent avec les écarts simultanés du baromètre", [http://visualiseur.bnf.fr/CadresFenetre?O=NUMM-3002&M=tdm "Académie des sciences (France). Comptes rendus hebdomadaires"] , TOME XLV, JUILLET - DÉCEMBRE (1857) pp. 765–768.