A fall after very calm and warm weather indicates rain and squalls.
The barometer rises for a northerly wind, 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 a 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, when moderate wind, with rain or snow, comes from the northward.
A fall, with a south wind, precedes rain.
A sudden and considerable fall, with the wind due west, presages a violent storm from the north or northwest, during which the glass will rise to its former height.
A steady and considerable fall of the barometer during an east wind indicates a shift of wind to the southward, unless a heavy fall of snow or rain immediately follows.
A falling barometer, with the wind at north, brings bad weather; in summer rain and gales; in spring snows and frosts.
If, after a storm of wind and rain, the barometer remains steady at the point to which it had fallen, severe weather may follow without a change in the wind. But on the rising of the barometer a change of wind may be looked for.
The following rhymes are familiar to most sailors:
When the glass falls low,