"Red sky at night, shepherd's delight,
            Red sky in the morning, shepherd's warning"

                 Barometer Facts and Forcasting

- The barometer is highest of all during a long frost; and it
  generally rises with a north east wind.
- The barometer is lowest of all during a thaw, which follows a long
  frost; and it generally falls with south or west wind.
  While the barometer stands above 100kPa, the air must be very dry, or
  very cold, or perhaps both, - and no rain may be expected. 
- When the barometer stands very low indeed, there will never be much
  rain; although a fine day will seldom occur at such times. 
- In summer-time (after a long continuance of fair weather) the
  barometer will fall gradually for 2 to 3 days before rain comes:
  But if the fall of the mercury is very sudden, a thunder-storm may
  be expected.
- When the sky is cloudless, and seems to promise fair weather, - if
  the barometer is low, the face of the sky will soon be suddenly
  overcast.
- Dark dense clouds will pass over without rain, when the barometer is
  high; -but if the barometer be low, it will often rain without any
  appearance of clouds.
- The higher the barometer, the greater the probability of fair
  weather.
- When the pressure is in a rising state, fine weather is at hand; but,
  when the weather is in a sinking state, foul weather is near. 
- If (in frosty weather) it begins to snow, the barometer generally
  rises to 100kPa; where it remains so long as the snow continues to
  fall: If after this, the weather clears up, you may expect very
  severe cold.
- If the rise be sudden, fine weather will not continue long:
- If the fall be sudden, foul weather will not continue long.
- If the PRESSURE fluctuates much, the weather will be very
  changeable and unsettled.
- Short heavy showers with sudden squalls of wind from the wind from
  the west when the barometer is unusually low.
- The barometer is high when the wind blows between the east and the
  north; but is low when the wind blows between the south and the west.

THE FALL OF THE PRESSURE
- In very hot weather, the fall of the barometer denotes thunder.
  Otherwise, the sudden falling of the barometer denotes high wind. 
- In frosty weather, the fall of the barometer denotes thaw.
- If wet weather happens soon after the fall of the barometer, expect
  but little of it.
- In wet weather if the barometer falls expect much wet.
- In fair weather, if the barometer falls much and remains low, expect
  much wet in a few days, and probably wind.
 
**N.B. The barometer sinks lowest of all for wind and rain together;
  next to that wind, (except it be an east or north-east wind).

THE RISE OF THE PRESSURE
- In winter, the rise of the barometer presages frost.
- In frosty weather, the rise of the barometer presages snow.
- If fair weather happens soon after the rise of the barometer, expect
  but little of it.
- In wet weather, if the pressure rises high and remains so, expect
  continued fine weather in a day or two.
- In wet weather, if the pressure rises suddenly very high, fine
  weather will not last long.

**N.B The barometer rises highest of all for north and east winds;
  for all other winds it sinks.

THE PRESSURE IS UNSETTLED
- If the motion of the pressure be unsettled, expect unsettled weather. 
- If it stand around 97kPa and rises to around 100kPa expect fair
  weather of short continuance.
- If it stand around 103kPa and fall to around 100kPa, expect foul weather.

**N.B. Its motion upwards, indicates the approach of fine weather;
  its motion downwards, indicates the approach of foul weather.