Raphael Semmes, Memoirs of Service Afloat During the War Between the States

[470] or dying monsoon will recede, for days together, its enemy, the in-coming monsoon, greedily advancing to occupy the space left vacant. The retreating wind will then rally, regain its courage, and drive back, at least for a part of the way, the pursuing wind. In this way, the two will alternate for weeks, each watching the other as warily, as if they were opposing armies. It is during these struggles, when the atmosphere is unhinged, as it were, that the typhoon makes its awful appearance. Every reader is familiar with the phenomenon of the miniature whirlwind, which he has so often seen sweep along a street or road, for a short distance, and then disappear; the want of local equilibrium in the atmosphere, which gave rise to it, having been restored.

These little whirlwinds generally occur at street-corners, or at cross-roads, and are produced by the meeting of two winds. When these winds meet, the stronger will bend the weaker, and a whirl will ensue. The two winds still coming on, the whirl will be increased, and thus a whirlwind is formed, which immediately begins to travel—not at random, of course, but in the direction of least pressure. The meeting of two currents of water, which form a whirlpool, may be used as another illustration. It is just so, that the typhoon is formed. It steps in as a great conservator of the peace, to put an end to the atmospherical strife which has been going on, and to restore harmony to nature. It is a terrible scourge whilst it lasts; the whole heavens seem to be in disorder, and that which was only a partial battle between outposts of the aerial armies, has now become a general engagement. The great whirl sweeps over a thousand miles or more, and when it has ceased, nature smiles again; the old monsoon has given up the ghost, and the new monsoon has taken its place. All will be peace now until the next change—the storms that will occur in the interval, being more or less local. We have monsoons in the western hemisphere, as well as in the eastern, though they are much more partial, both in space and duration.

The cyclones which sweep over the North Atlantic are generated, as has been remarked, to the eastward of the West India Islands—somewhere between them and the coast of Brazil. They occur in August, September, and October—sometimes,