Discussion And Analysis Of Professor Coffins Tables And Charts Of Teh Wind Of The Globe

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1876 edition. Excerpt: ... the Atlantic. The mean direction of the wind is then more northerly, or even northwesterly, as shown in the next table, and the maps, Plates 7, 8, and 14. The Florida Keys and the Northern Bahamas belong approximately to the tradewind region, though, owing to the powerful influence of the continent, the winds are E. S. E. in summer. But this is also the case in the West Indies. In the other seasons the mean direction is nearly E. N. E., and the ratio great, though certainly not so great as further south, in the middle of the ocean, where it often attains from.80 to.90. The same may be said of S. E. Florida, only the winds are less regular, as is seen by the smallness of the ratio of resultant. On the northern shore of the Gulf of Mexico, and to about 32 N. L., the winds are northeasterly in autumn, but the ratio of resultant is so small as not to warrant the calling of this a region of trade-winds. Pressure is high at this season, and a little lower on the Gulf, but the difference is very small. Besides this, the variations of pressure and temperature are great here in winter. When a belt of low pressure, a storm-centre, reaches the upper Mississippi, air is drawn from the Gulf to supply the deficiency. South winds, with high temperature and abundant precipitation, are the result. In spring and summer the Gulf States have southerly winds from the Atlantic and the Gulf. They then prevail to a greater extent than the northeasterly winds of winter. I give below, the mean direction for the year, and the ratio of resultant, to show how nearly balanced are the different directions, except in the Northern Bahamas, Florida Keys, and S. E. Florida, where the N. E. movement is well marked. (See also Plate 3.) Except the last-named areas, we find a...