The inhabitants of the earth are subjected to agencies which—beneficial doubtless in the long run, perhaps necessary to the very existence of terrestrial races—appear, at first sight, energetically destructive. Such are—in order of destructiveness—the hurricane, the earthquake, the volcano, and the thunderstorm. When we read of earthquakes such as those which overthrew1 Lisbon, Callao, and Riobamba, and learn that one hundred thousand persons fell victims in the great Sicilian earthquake in 1693, and probably three hundred thousand in the two earthquakes which assailed2 Antioch in the years 526 and 612, we are disposed to assign at once to this devastating3 phenomenon the foremost place among the agents of destruction. But this judgment4 must be reversed when we consider that earthquakes—though so fearfully and suddenly destructive both to life and property—yet occur but seldom com154pared with wind-storms, while the effects of a real hurricane are scarcely less destructive than those of the sharpest shocks of earthquakes. After ordinary storms, long miles of the sea-coast are strewn with the wrecks6 of many once gallant7 ships, and with the bodies of their hapless crews. In the spring of 1866 there might be seen at a single view from the heights near Plymouth twenty-two shipwrecked vessels9, and this after a storm which, though severe, was but trifling10 compared with the hurricanes which sweep over the torrid zones, and thence—scarcely diminished in force—as far north sometimes as our own latitudes12. It was in such a hurricane that the ‘Royal Charter’ was wrecked8, and hundreds of stout13 ships with her. In the great hurricane of 1780, which commenced at Barbadoes and swept across the whole breadth of the North Atlantic, fifty sails were driven ashore14 at the Bermudas, two line-of-battle ships went down at sea, and upwards15 of twenty thousand persons lost their lives on the land. So tremendous was the force of this hurricane (Captain Maury tells us) that ‘the bark was blown from the trees, and the fruits of the earth destroyed; the very bottom and depths of the sea were uprooted—forts and castles were washed away, and their great guns carried in the air like chaff16; houses were razed17; ships wrecked; and the bodies of men and beasts lifted up in the air and dashed to pieces in the storm’—an account, however, which (though doubtless faithfully rendered by Maury from the authorities he consulted) must perhaps be accepted cum grano, and155 especially with reference to the great guns carried in the air ‘like chaff.’12 (If so, it ‘blew great guns,’ indeed.)
In the gale18 of August, 1782, all the trophies19 of Lord Rodney’s victory, except the ‘Ardent,’ were destroyed, two British ships-of-the-line foundered20 at sea, numbers of merchantmen under Admiral Graves’ convoy21 were wrecked, and at sea alone three thousand lives were lost.
But quite recently a storm far more destructive than these swept over the Bay of Bengal. Most of my readers doubtless remember the great gale of October 1864, in which all the ships in harbour at Calcutta were swept from their anchorage, and driven one upon another in inextricable confusion. Fearful as was the loss of life and property in Calcutta harbour, the destruction on land was greater. A vast wave swept for miles over the surrounding country, embankments were destroyed, and whole villages, with their inhabitants, were swept away. Fifty thousand souls, it is believed, perished in this fearful hurricane.
The gale which has just ravaged22 the Gulf23 of Mexico adds another to the long list of disastrous24 hurricanes. As I write, the effects produced by this tornado25 are beginning to be made known. Already its destructiveness has become but too certainly evidenced.
The laws which appear to regulate the generation156 and the progress of cyclonic26 storms are well worthy27 of careful study.
The regions chiefly infested28 by hurricanes are the West Indies, the southern parts of the Indian Ocean, the Bay of Bengal, and the China Seas. Each region has its special hurricane season.
In the West Indies, cyclones29 occur principally in August and September, when the south-east monsoons31 are at their height. At the same season the African south-westerly monsoons are blowing. Accordingly there are two sets of winds, both blowing heavily and steadily32 from the Atlantic, disturbing the atmospheric33 equilibrium34, and thus in all probability generating the great West Indian hurricanes. The storms thus arising show their force first at a distance of about six or seven hundred miles from the equator, and far to the east of the region in which they attain35 their greatest fury. They sweep with a north-westerly course to the Gulf of Mexico, pass thence northwards, and so to the north-east, sweeping37 in a wide curve (resembling the letter ∪ placed thus ?) around the West Indian seas, and thence travelling across the Atlantic, generally expending38 their fury before they reach the shores of Western Europe. This course is the storm-track (or storm-? as I shall call it). Of the behaviour of the winds as they traverse this track, I shall have to speak when I come to consider the peculiarity39 from which these storms derive40 their names of ‘cyclones’ and tornadoes41.
The hurricanes of the Indian Ocean occur at the157 ‘changing of the monsoons.’ ‘During the interregnum,‘ writes Maury, ‘the fiends of the storm hold their terrific sway.’ Becalmed often for a day or two, seamen42 hear moaning sounds in the air, forewarning them of the coming storm. Then, suddenly, the winds break loose from the forces which have for a while controlled them, and ‘seem to rage with a fury that would break up the fountains of the deep.’
In the North Indian seas hurricanes rage at the same season as in the West Indies.
In the China seas occur those fearful gales43 known among sailors as ‘typhoons’ or ‘white squalls.’ These take place at the changing of the monsoons. Generated, like the West Indian hurricanes, at a distance of some ten or twelve degrees from the equator, typhoons sweep—in a curve similar to that followed by the Atlantic storms—around the East Indian Archipelago, and the shores of China, to the Japanese Islands.
There occur land-storms, also, of a cyclonic character in the valley of the Mississippi. ‘I have often observed the paths of such storms,’ says Maury, ‘through the forests of the Mississippi. There the track of these tornadoes is called a “wind-road,” because they make an avenue through the wood straight along, and as clear of trees as if the old denizens44 of the forest had been cleared with an axe45. I have seen trees three or four feet in diameter torn up by the roots, and the top, with its limbs, lying next the hole whence the root came158.‘ Another writer, who was an eye-witness to the progress of one of these American land-storms, thus speaks of its destructive effects. ‘I saw, to my great astonishment46, that the noblest trees of the forest were falling into pieces. A mass of branches, twigs47, foliage48, and dust moved through the air, whirled onward49 like a cloud of feathers, and passing, disclosed a wide space filled with broken trees, naked stumps50, and heaps of shapeless ruins, which marked the path of the tempest.’
If it appeared, on a careful comparison of observations made in different places, that these winds swept directly along those tracks which they appear to follow, a comparatively simple problem would be presented to the meteorologist. But this is not found to be the case. At one part of a hurricane’s course the storm appears to be travelling with fearful fury along the true storm-?; at another less furiously directed across the storm-track; at another, but with yet diminished force, though still fiercely, in a direction exactly opposite to that of the storm-track.
All these motions appear to be fairly accounted for by the theory that the true path of the storm is a spiral—or rather, that while the centre of disturbance51 continually travels onwards in a widely extended curve, the storm-wind sweeps continually around the centre of disturbance, as a whirlpool around its vortex.
And here a remarkable52 circumstance attracts our notice, the consideration of which points to the mode in which cyclones may be conceived to be generated. It is found, by a careful study of different observations159 made upon the same storm, that cyclones in the northern hemisphere invariably sweep round the onward travelling vortex of disturbance in one direction, and southern cyclones in the contrary direction. If we place a watch, face upwards, upon one of the northern cyclone30 regions in a Mercator’s chart, then the motion of the hands is contrary to the direction in which the cyclone whirls; when the watch is shifted to a southern cyclone region, the motion of the hands is in the same direction as the cyclone motion. This peculiarity is converted into the following rule-of-thumb for sailors who encounter a cyclone, and seek to escape from the region of fiercest storm:—Facing the wind, the centre or vortex of the storm lies to the right in the northern, to the left in the southern hemisphere. Safety lies in flying from the centre in every case save one—that is, when the sailor lies in the direct track of the advancing vortex. In this case, to fly from the centre would be to keep in the storm-track; the proper course for the sailor when thus situated54 is to steer55 for the calmer side of the storm-track. This is always the outside of the ?, as will appear from a moment’s consideration of the spiral curve traced out by a cyclone. Thus, if the seaman56 scud57 before the wind—in all other cases a dangerous expedient58 in a cyclone13—he will probably escape unscathed. There is, however, this danger, that the160 storm-track may extend to or even slightly overlap59 the land, in which case scudding60 before the gale would bring the ship upon a lee-shore. And in this way many gallant ships have, doubtless, suffered wreck5.
The danger of the sailor is obviously greater, however, when he is overtaken by the storm on the inner side of the storm-?. Here he has to encounter the double force of the cyclonic whirl and of the advancing storm-system, instead of the difference of the two motions, as on the outer side of the storm-track. His chance of escape will depend on his distance from the central path of the cyclone. If near to this, it is equally dangerous for him to attempt to scud to the safer side of the track, or to beat against the wind by the shorter course, which would lead him out of the storm-? on its inner side. It has been shown by Colonel Sir W. Reid that this is the quarter in which vessels have been most frequently lost.
But even the danger of this most dangerous quarter admits of degrees. It is greatest where the storm is sweeping round the most curved part of its track, which happens in about latitude11 twenty-five or thirty degrees. In this case a ship may pass twice through the vortex of the storm. Here hurricanes have worked their most destructive effects. And hence it is that sailors dread61, most of all, that part of the Atlantic near Florida and the Bahamas, and the region of the Indian Ocean which lies south of Bourbon and Mauritius.
To show how important it is that captains should161 understand the theory of cyclones in both hemispheres, we shall here relate the manner in which Captain J. V. Hall escaped from a typhoon of the China seas. About noon, when three days out from Macao, Captain Hall saw ‘a most wild and uncommon62-looking halo round the sun.’ On the afternoon of the next day, the barometer63 had commenced to fall rapidly; and though, as yet, the weather was fine, orders were at once given to prepare for a heavy gale. Towards evening a bank of cloud was seen in the south-east, but when night closed the weather was still calm and the water smooth, though the sky looked wild and a scud was coming on from the north-east. ‘I was much interested,’ says Captain Hall, ‘in watching for the commencement of the gale, which I now felt sure was coming. That bank to the south-east was the meteor (cyclone) approaching us, the north-east scud, the outer north-west portion of it; and when at night a strong gale came on about north, or north-north-west, I felt certain we were on its western and south-western verge64. It rapidly increased in violence; but I was pleased to see the wind veering65 to the north-west, as it convinced me that I had put the ship on the right track—namely, on the starboard tack66, standing67, of course, to the south-west. From ten A.M. to three P.M. it blew with great violence, but the ship being well prepared, rode comparatively easy. The barometer was now very low, the centre of the storm passing to the northward36 of us, to which we might have been very near had we in the first place put the ship on the larboard tack.
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But the most remarkable point of Captain Hall’s account remains68 to be mentioned. He had gone out of his course to avoid the storm, but when the wind fell to a moderate gale he thought it a pity to lie so far from his proper course, and made sail to the north-west. ‘In less than two hours the barometer again began to fall and the storm to rage in heavy gusts69.’ He bore again to the south-east, and the weather rapidly improved. There can be little doubt that but for Captain Hall’s knowledge of the law of cyclones, his ship and crew would have been placed in serious jeopardy70, since in the heart of a Chinese typhoon a ship has been known to be thrown on her beam-ends when not showing a yard of canvas.
If we consider the regions in which cyclones appear, the paths they follow, and the direction in which they whirl, we shall be able to form an opinion as to their origin. In the open Pacific Ocean (as its name, indeed, implies) storms are uncommon; they are infrequent also in the South Atlantic and South Indian Oceans. Around Cape53 Horn and the Cape of Good Hope heavy storms prevail, but they are not cyclonic, nor are they equal in fury and frequency, Maury tells us, to the true tornado. Along the equator, and for several degrees on either side of it, cyclones are also unknown. If we turn to a map in which ocean-currents are laid down, we shall see that in every ‘cyclone region’ there is a strongly marked current, and that each current follows closely the track which I have denominated the storm-?. In the North Atlantic we have the great Gulf163 Stream, which sweeps from equatorial regions into the Gulf of Mexico, and thence across the Atlantic to the shores of Western Europe. In the South Indian Ocean there is the ‘south equatorial current,’ which sweeps past Mauritius and Bourbon, and thence returns towards the east. In the Chinese Sea there is the north equatorial current, which sweeps round the East Indian Archipelago, and then merges71 into the Japanese current. There is also the current in the Bay of Bengal, flowing through the region in which, as we have seen, cyclones are commonly met with. There are other sea-currents besides these which yet breed no cyclones. But I may notice two peculiarities72 in the currents I have named. They all flow from equatorial to temperate73 regions, and, secondly74, they are all ‘horse-shoe currents.’ So far as I am aware, there is but one other current which presents both these peculiarities—namely, the great Australian current between New Zealand and the eastern shores of Australia. I have not yet met with any record of cyclones occurring over the Australian current, but heavy storms are known to prevail in that region, and I believe that when these storms have been studied as closely as the storms in better-known regions, they will be found to present the true cyclonic character.
Now, if we inquire why an ocean current travelling from the equator should be a ‘storm-breeder,’ we shall find a ready answer. Such a current, carrying the warmth of intertropical regions to the temperate zones,164 produces, in the first place, by the mere75 difference of temperature, important atmospheric disturbances76. The difference is so great, that Franklin suggested the use of the thermometer in the North Atlantic Ocean as a ready means of determining the longitude77, since the position of the Gulf Stream at any given season is almost constant.
But the warmth of the stream itself is not the only cause of atmospheric disturbance. Over the warm water vapour is continually rising; and, as it rises, is continually condensed (like the steam from a locomotive) by the colder air round. ‘An observer on the moon,’ says Captain Maury, ‘would, on a winter’s day, be able to trace out by the mist in the air the path of the Gulf Stream through the sea.’ But what must happen when vapour is condensed? We know that to turn water into vapour is a process requiring—that is, using up—a large amount of heat; and, conversely, the return of vapour to the state of water sets free an equivalent quantity of heat. The amount of heat thus set free over the Gulf Stream is thousands of times greater than that which would be generated by the whole coal supply annually78 raised in Great Britain. Here, then, we have an efficient cause for the wildest hurricanes. For, along the whole of the Gulf Stream, from Bemini to the Grand Banks, there is a channel of heated—that is, rarefied air. Into this channel, the denser79 atmosphere on both sides is continually pouring, with greater or less strength. When a storm begins in the Atlantic, it always makes165 for this channel, ‘and, reaching it, turns and follows it in its course, sometimes entirely80 across the Atlantic.’ ‘The southern points of America and Africa have won for themselves,’ says Maury, ‘the name of “the stormy capes,” but there is not a storm-find in the wide ocean can out-top that which rages along the Atlantic coasts of North America. The China seas and the North Pacific may vie in the fury of their gales with this part of the Atlantic, but Cape Horn and the Cape of Good Hope cannot equal them, certainly in frequency, nor do I believe, in fury.’ We read of a West Indian storm so violent, that ‘it forced the Gulf Stream back to its sources, and piled up the water to a height of thirty feet in the Gulf of Mexico. The ship “Ledbury Snow” attempted to ride out the storm. When it abated81 she found herself high up on the dry land, and discovered that she had let go her anchor among the tree-tops on Elliot’s Key166.‘
By a like reasoning, we can account for the cyclonic storms prevailing82 in the North Pacific Ocean. Nor do the tornadoes which rage in parts of the United States present any serious difficulty. The region along which these storms travel is the valley of the great Mississippi. This river at certain seasons is considerably83 warmer than the surrounding lands. From its surface, also, aqueous vapour is continually being raised. When the surrounding air is colder, this vapour is presently condensed, generating in the change a vast amount of heat. We have thus a channel of rarefied air over the Mississippi valley, and this channel becomes a storm-track, like the corresponding channels over the warm ocean-currents. The extreme violence of land-storms is probably due to the narrowness of the track within which they are compelled to travel. For it has been noticed that the fury of a sea-cyclone increases as the range of the ‘whirl’ diminishes, and vice84 versa.
There seems, however, no special reason why cyclones should follow the storm-? in one direction rather than in the other. We must, to understand this, recall the fact that under the torrid zones the conditions necessary for the generation of storms prevail far more intensely than in temperate regions. Thus the probability is far greater that cyclones should be generated at the tropical than at the temperate end of the storm-?. Still, it is worthy of notice, that in the land-locked North Pacific Ocean, true typhoons have been noticed to follow the storm-track in a direction contrary to that commonly noticed.
The direction in which a true tornado whirls is invariably that I have mentioned. The explanation of this peculiarity would occupy more space than I can here afford. Those readers who may wish to understand the origin of the law of cyclonic rotation85 should study Herschel’s interesting work on Meteorology.
The suddenness with which a true tornado works destruction was strikingly exemplified in the wreck of the steamship86 ‘San Francisco.’ She was assailed by an extra-tropical tornado when about 300 miles from167 Sandy Hook, on December 24, 1853. In a few moments she was a complete wreck! The wide range of a tornado’s destructiveness is shown by this, that Colonel Reid tells us of one along whose track no less than 110 ships were wrecked, crippled, or dismasted.
(From Temple Bar, December 1867.)
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overthrew
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| overthrow的过去式 | |
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assailed
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devastating
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| adj.毁灭性的，令人震惊的，强有力的 | |
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judgment
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wreck
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| n.失事，遇难；沉船；vt.(船等)失事，遇难 | |
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wrecks
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| n.沉船( wreck的名词复数 )；（事故中）遭严重毁坏的汽车（或飞机等）；（身体或精神上）受到严重损伤的人；状况非常糟糕的车辆（或建筑物等）v.毁坏[毁灭]某物( wreck的第三人称单数 )；使（船舶）失事，使遇难，使下沉 | |
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gallant
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wrecked
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vessels
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trifling
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latitude
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| n.纬度，行动或言论的自由(范围)，(pl.)地区 | |
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latitudes
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ashore
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upwards
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chaff
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razed
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| v.彻底摧毁，将…夷为平地( raze的过去式和过去分词 ) | |
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gale
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| n.大风，强风，一阵闹声（尤指笑声等） | |
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trophies
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| n.（为竞赛获胜者颁发的）奖品( trophy的名词复数 )；奖杯；（尤指狩猎或战争中获得的）纪念品；（用于比赛或赛跑名称）奖 | |
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foundered
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convoy
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ravaged
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gulf
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disastrous
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tornado
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| n.飓风，龙卷风 | |
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cyclonic
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| adj.气旋的，飓风的 | |
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worthy
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| adj.(of)值得的，配得上的；有价值的 | |
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infested
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| adj.为患的，大批滋生的（常与with搭配）v.害虫、野兽大批出没于( infest的过去式和过去分词 )；遍布于 | |
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cyclones
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| n.气旋( cyclone的名词复数 )；旋风；飓风；暴风 | |
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cyclone
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monsoons
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| n.（南亚、尤指印度洋的）季风( monsoon的名词复数 )；（与季风相伴的）雨季；（南亚地区的）雨季 | |
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steadily
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atmospheric
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equilibrium
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attain
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northward
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sweeping
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| adj.范围广大的，一扫无遗的 | |
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expending
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| v.花费( expend的现在分词 )；使用（钱等）做某事；用光；耗尽 | |
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peculiarity
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derive
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| v.取得；导出；引申；来自；源自；出自 | |
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tornadoes
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| n.龙卷风，旋风( tornado的名词复数 ) | |
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seamen
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| n.海员 | |
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gales
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denizens
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axe
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| n.斧子；v.用斧头砍，削减 | |
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astonishment
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| n.惊奇，惊异 | |
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twigs
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| 细枝，嫩枝( twig的名词复数 ) | |
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foliage
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onward
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| adj.向前的，前进的；adv.向前，前进，在先 | |
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stumps
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| （被砍下的树的）树桩( stump的名词复数 )； 残肢； （板球三柱门的）柱； 残余部分 | |
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disturbance
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| n.动乱，骚动；打扰，干扰；(身心)失调 | |
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remarkable
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| adj.显著的，异常的，非凡的，值得注意的 | |
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cape
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| n.海角，岬；披肩，短披风 | |
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situated
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| adj.坐落在...的，处于某种境地的 | |
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steer
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| vt.驾驶，为…操舵；引导；vi.驾驶 | |
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seaman
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| n.海员，水手，水兵 | |
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scud
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| n.疾行；v.疾行 | |
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expedient
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| adj.有用的，有利的；n.紧急的办法，权宜之计 | |
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overlap
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| v.重叠，与…交叠；n.重叠 | |
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scudding
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| n.刮面v.（尤指船、舰或云彩）笔直、高速而平稳地移动( scud的现在分词 ) | |
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dread
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| vt.担忧，忧虑；惧怕，不敢；n.担忧，畏惧 | |
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uncommon
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| adj.罕见的，非凡的，不平常的 | |
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barometer
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| n.气压表，睛雨表，反应指标 | |
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verge
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| n.边，边缘；v.接近，濒临 | |
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veering
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| n.改变的；犹豫的；顺时针方向转向；特指使船尾转向上风来改变航向v.（尤指交通工具）改变方向或路线( veer的现在分词 )；（指谈话内容、人的行为或观点）突然改变；（指风） （在北半球按顺时针方向、在南半球按逆时针方向）逐渐转向；风向顺时针转 | |
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tack
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| n.大头钉；假缝，粗缝 | |
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standing
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| n.持续，地位；adj.永久的，不动的，直立的，不流动的 | |
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remains
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| n.剩余物，残留物；遗体，遗迹 | |
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gusts
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| 一阵强风( gust的名词复数 )； （怒、笑等的）爆发； （感情的）迸发； 发作 | |
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jeopardy
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| n.危险；危难 | |
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merges
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| （使）混合( merge的第三人称单数 )； 相融； 融入； 渐渐消失在某物中 | |
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peculiarities
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| n. 特质, 特性, 怪癖, 古怪 | |
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temperate
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| adj.温和的，温带的，自我克制的，不过分的 | |
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secondly
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| adv.第二，其次 | |
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mere
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| adj.纯粹的；仅仅，只不过 | |
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disturbances
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| n.骚乱( disturbance的名词复数 )；打扰；困扰；障碍 | |
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longitude
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| n.经线，经度 | |
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annually
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| adv.一年一次，每年 | |
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denser
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| adj. 不易看透的, 密集的, 浓厚的, 愚钝的 | |
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entirely
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| ad.全部地，完整地；完全地，彻底地 | |
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abated
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| 减少( abate的过去式和过去分词 )； 减去； 降价； 撤消（诉讼） | |
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prevailing
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| adj.盛行的；占优势的；主要的 | |
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considerably
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| adv.极大地；相当大地；在很大程度上 | |
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vice
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| n.坏事；恶习；[pl.]台钳，老虎钳；adj.副的 | |
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rotation
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| n.旋转；循环，轮流 | |
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steamship
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| n.汽船，轮船 | |
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