The following rules are those which are used by the
Seawanhaka-Corinthian Yacht Club in their very successful attempts to
forecast the weather with the aid of the barometer.
A Rising Barometer.—A rapid rise indicates unsettled weather. A gradual
rise indicates settled weather. A rise with dry air and cold air
increasing in summer indicates wind from the northward; and if rain has
fallen, better weather may be expected. A rise with moist air and a low
temperature indicates wind and rain from the northward. A rise with
southerly winds indicates fine weather.
A Steady Barometer.—With dry air and seasonable temperature indicates a
continuance of very fine weather.
A Falling Barometer.—A rapid fall indicates stormy weather. A rapid fall
with westerly wind indicates stormy weather from the northward. A fall
with a northerly wind indicates storm, with rain and hail in summer, and
snow in winter. A fall with increased moisture in the air and heat
increasing indicates wind and rain from the southward. A fall with dry
air and cold increasing in winter indicates snow. A fall after very calm
and warm weather indicates rain with squally weather.
The barometer rises for northerly winds, including from northwest by
north to the eastward for dry or less wet weather, for less wind, or for
more than one of these changes, except on a few occasions, when rain,
hail, or snow comes from the northward with strong wind.
The barometer falls for southerly wind, including from southeast by
south to the westward, for wet weather, for stronger wind, or for more
than one of these changes, except on a few occasions, moderate wind,
with rain or snow, comes from the northward.