The Law of Storms / The various phenomena by which their approach can be ascertained with certainty, and practical directions to mariners for the avoidance of their fury, compiled from various sources

by John Ross

A Thermometer Falls:

For change of wind towards any of the above directions.

The Barometer Falls:

For southerly wind (including from S. E. by the 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.