At the commencement of a tornado, dark clouds appear above the eastern horizon, which rapidly ascend, until a dense looking mass spreads over the whole hemisphere. As the heavy mass of clouds ascends and spreads, the roaring sound of the wind becomes stronger and louder, until suddenly it bursts forth in its fury; sometimes seeming as if it would sweep away every opposing object. Very seldom, however, is any material injury sustained from these violent gusts. The scene is sometimes awfully grand, for fifteen or twenty minutes, during the formation and continuance of a heavy tornado. Sometimes the whole hemisphere presents a scene of the deepest gloom; the darkness of which is momentarily illuminated by vivid flashes of lightning, in rapid succession; and sometimes tremendous peals of thunder burst upon the solemn stillness of the scene. The rain seldom falls, until the violence of the gust begins to subside; when a torrent of rain usually pours down for a short time, seldom more than half an hour; after which, the wind shifts around towards the west; and generally, in about an hour from the commencement of the tornado, the sky becomes serene, and sometimes almost cloudless. The weather during the month of _May_ is usually more pleasant, than during the two preceding months. The atmosphere is generally not quite so warm and oppressive. Sometimes copious and protracted showers of rain fall, during the latter half of this month; so that the beginning of the rainy season usually occurs in this month. Tornadoes also occasionally appear, during the month of May. The average height of the mercury in the thermometer is usually two or three degrees less, than during the four preceding months.