Page:Weather Facts and Predictions.djvu/51

 and hot summers in places to the leeward, as compared with places to the windward, [by more fully exposing them to both solar and terrestrial radiation.]

After fine weather, the first signs of a change are usually light streaks, curls, wisps, or mottled patches of white distant clouds, which gradually consolidate into a general overcasting of the sky.

Usually, the higher and more distant such clouds seem to be, the more gradual but general the coming change of weather will prove.

When the outlines of distant hills are very clearly seen, and waterfalls and railway whistles are very distinctly heard, rain is indicated. [N. and E., that is dry winds, are suddenly followed by a moist wind, the vapours of which condensing on particles of dust floating about in the air makes them heavy, and they sink to the ground.]

When, in winter or spring, during rough, sleety, or rainy weather, fires seem to crackle and throw out more heat, the weather will probably soon clear up, with frost or frosty air following.

A gray, dull, morning is nearly sure to turn to a fine, clear, day.

When frogs dive below the surface of ponds &c., out of the way, rain is certainly impending.