The Practical Use of Meteorological Reports and Weather MapsR. Beresford, Printer, 1871 - 76 pages |
Other editions - View all
The Practical Use of Meteorological Reports and Weather Maps United States Army Signal Corps No preview available - 2018 |
The Practical Use of Meteorological Reports and Weather-Maps United States Army Signal Corps No preview available - 2023 |
Common terms and phrases
anti-cyclonic areas of high areas of low Atlantic coast atmosphere barometer falls barometer rises barometric pressure barometrical readings Beaufort Scale BULB THERMOMETER bulletins cautionary signal central area changes Chief Signal Officer cirrus cirrus clouds clouds cumulus cumulus clouds currents of air cyclones deflection direction disturbance earth earth's surface east easterly eastward equator exist Ferrel Ferrel's Law friction gales Grand Haven heat height high barometer high pressure hundred miles hygrometer inches indicated instrument isobaric isobarometric lakes laws low barometer low pressure lower lowest pressure mercury meteorological miles per hour moist air moisture motion move movement neighboring northeast northern hemisphere observations ocean outer dial polar bands poles portion prevail radiation rain regions Relative Humidity reports rise rotation saturated side snow southwest spiral storm center strata stratum temperature thermometer tion tornadoes upper currents vanishing points vapor velocity vernier Washington weather map westerly wet bulb whirl whirlwind winter
Popular passages
Page 48 - in whatever direction a body moves on the surface of the earth, there is a force arising from the earth's rotation which deflects it to the right in the northern hemisphere, but to the left in the southern.
Page 45 - Many storms are of great and unknown length from north to south, reaching beyond our observers on the Gulf of Mexico and on the northern lakes, while their east and west diameter is comparatively small. The storms, therefore, move side foremost. 11. Most storms commence in the "far west...
Page 44 - ... forced upward in the atmosphere. The foregoing is simply a statement of results which I have derived from a long course of observation and inquiry. It does not include the partial and imperfect exhibitions of whirlwind action, which often occur, nor the various movements and phenomena which are...
Page 44 - ... may be inferred from the observations which have been made in the axial portions of the great cyclones. Into this axial area of the tornado the bodies forced upward by the vortex cannot fall, but will be discharged outward, from the ascending whirl.
Page 45 - The rain and snow storms, and even the moderate rains and snows, travel from the west towards the east in the United States, during the months of January, February, and March, which are the only months yet investigated. "2d. The storms are accompanied with a depression of the barometer near the central line of the storm.
Page 67 - ... thus there are found northerly winds on the west side of the region, westerly ones on the south side, and so around. Of these winds those from the northwest and southwest are more violent, on the average, than...
Page 46 - There is generally but little wind near the line of maximum pressure, and on each side of that line the winds are irregular, but tend outwards from that line.
Page 45 - When the barometer falls suddenly in the western part of New England, it rises at the same time in the valley of the Mississippi, and also at St.
Page 52 - Our recent storms have been anti-cyclonic, and there seems some reason for supposing that anti-cyclones are the usual " weather-breeders," even of such of our land storms as become more or less cyclonic after they are fully developed. (7.) The precipitation of vapor of course gives rise to local cyclones, which, however, may be easily and speedily overborne by the grand anti-cyclonic whirls of a half million miles or more in area. (8.) These and other peculiarities, point to a probable origin of...
Page 44 - ... so called. 5. Accessions caused by circumjacent contact and pressure are constantly accruing to the whirling body, so long as its rotative energy is maintained. A correlative diffusion from its ascending portion must necessarily take place towards its upper horizon : and this is often manifested by the great extent or accumulation of cloud which results in this manner from the action of the tornado. In other words, there is a constant discharge from the whirling body in the direction of least...