Light cirrus or cirro-stratus clouds move from the west, apparently very high in the atmosphere; humidity and wind decrease, and occasionally a calm ensues. This is followed by light winds from northeast, east, or southeast. Barometer begins to fall, and temperature to rise slowly; humidity increases steadily; cumulus clouds appear, moving slowly from west or southwest, and are soon followed by cumulo-stratus; wind increases in velocity, and shortly before precipitation occurs a dense white vapor, resembling haze, and moving with the surface current, gradually covers the whole sky.
Wind-storms are preceded by unusually rapid barometric depression, increase in temperature and humidity, stratus or cumulo-stratus clouds, with southwest winds. Water at the head of Lake Erie rises in advance of the storm.
Burlington, Vt.
Rapidly falling barometer, rising temperature, and cumulo-stratus or stratus clouds, with wind from south or southwest.
Cairo, Ill.
Falling barometer, rising temperature, stratus or cumulo-stratus, with wind from the south or southwest, precede rain; wind-storms are preceded by rising barometer, falling temperature, and cirro-stratus clouds, with brisk wind from west or northwest. Well-defined lunar halos are followed by rain.
Cape Henry, Va.
Northeast storms are preceded by rapidly rising barometer and upper clouds (usually cirrus), moving rapidly from northeast in long white sheets changing to stratus in short time, and covering the whole sky.
Southeast storms are preceded by rapidly falling barometer, unusually low humidity and variable southwest winds. Heavy ocean-swell in advance of storm and from same direction in which storm is advancing.
Cape Hatteras, N. C.