Bulletin, Issue 10U.S. Government Printing Office, 1913 - Meteorology |
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Common terms and phrases
A.M. NOON area of high Arroyo atmospheric August and September August storms average barometer Bay of Bengal Caribbean Sea cent charts cirrus clouds coast cyclonic storm east FREQUENCY OF TROPICAL GUADELOUPE Gulf of Mexico high pressure hurricane area hurricane of August hurricane season hurricane signals inches increase intensity July storms June and July longitude MEAN PATH MID'T miles per day miles per hour months of August movement of hurricane NOON 6 P.M. NOON AUGUST normal track North Atlantic north latitude northeast northwest Number of storms Ocean October storms P.M. MIDT PATHS OF WEST Plate point of recurve points of origin Porto Rico progressive movement rain rainfall rate of movement SAN JUAN second branch Sept September storms southwest monsoon squalls squally weather ST.CU storm areas storm center tropical cyclones tropical storms typhoons Viñes Weather Bureau WEST INDIAN HURRICANES West Indies WIND DIRECTION WIND VELOCITY Windward Islands Yucatan Channel
Popular passages
Page 13 - They become more frequent and come down more fiercely and strongly with the gradual development of the storm. The area of unsettled and squally weather also extends in all directions, and usually most slowly to the north and west. If the unsettled weather advances beyond this stage (which it does not necessarily do) it is shown most clearly by the wind directions over the area of squalls. The winds always settle down into those which invariably occur over an area of barometric depression or cyclonic...
Page 16 - ... tropical hurricanes of the Caribbean area have a decided effect on the climate of the Republic of Haiti. The study of these hurricanes over a period of thirty-six years indicates their more frequent occurrence in the late high sun period months of August, September and October. 0. L. Fassig writes: " Similar conditions are doubtless produced within the hurricane area of the West Indies by the advance of the North Atlantic high into the region of calms, or by the conflict between the opposing...
Page 14 - The hurricane cloud, sometimes called the "bar of the cyclone," is a dense mass of rain cloud formed about the center of the storm, giving the appearance of a huge bank of black clouds resting upon the horizon. It may retain its form unchanged for hours. It is usually most conspicuous about sunrise or sunset. When it is possible to observe this cloud the changes in its position at intervals of a few hours will enable the observer to determine the direction of movement of the storm. Although the approximate...
Page 13 - ... perceived this is considered as a favorable sign indicating the speedy disappearance of the storm. Especially among the country folks this opinion is general and deeply rooted. The crashing of thunder and the crowing of the cock are here the barometer of the farmer during cyclones, a barometer, which, as he affirms, never deceives him. As long as the rooster does not crow, nor is there heard any peal of thunder, the storm will continue to rage in full force. But as soon as the lively crowing...
Page 13 - As soon as the wind-directions indicate that a definite centre of windconvergence has been formed in the Bay, it is also found that the centre never remains in the same position for any considerable interval of time, but that it moves or advances in some direction between north-east and west with velocities which not only differ very considerably in different storms, but also at different stages of the same storm.
Page 13 - ... storm is due to the prolonged continuance of actions, processes and changes of the same kind as those that are occurring in the atmosphere at all times when rain is falling and strongish humid winds are blowing. Whatever the causes and origin of cyclones may be, the history of all cyclones in the Bay shows that they are invariably preceded for longer or shorter periods by unsettled squally weather, and that during this period the air over a considerable portion of the Bay is gradually given a...
Page 13 - The daily reading is observed to be each day less than that of the preceding day. That part of the horizon in the direction of the storm begins to be covered by a cirrus veil, which increases slowly until it forms an almost homogeneous covering of the sky. This veil is known by the name " cirro-pallium " of Poey, and is that which causes the solar and lunar halos, which are never absent when a storm approaches. Beneath the veil a few isolated clouds, commonly called "cotton,
Page 13 - In order to ascertain approximately the direction in which the center is advancing in ita movement of translation, it is necessary to determine the changes of the radiant point at equal intervals of time and to compare them with the movements of the barometer. If the point of convergence does not perceptibly change its position, but remains fixed and immovable for a long time, even for several consecutive days, it is almost certain that the tempest will break over the position of the observer. In...
Page 13 - ... completely loses the diurnal and nocturnal oscillations; instead of rising at the hours indicated, it falls, or at least remains quiet if the storm is of little importance, or slow in its progress. The wind remains fixed at one point, generally between the NE. and NW., showing only a few oscillations, which are due principally to the squalls, which continually exert their force, within the limits of the storm. If the observation is made on...
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