The Trade Winds.—West of the 30th meridian the northeast trades lie mainly between the 5th and 26th parallels, but east of that meridian they are farther north, and the southern and northern limits touch the African coast at latitudes 12° and 32° N., respectively. A pronounced type of these trades occurs between the Cape Verde and Canary Islands. In mid-ocean the trades are easterly, but again become northeasterly over the West Indies, the Caribbean Sea, and the Gulf of Mexico.

The southeast trades extend about 4° north of the Equator west of the 15th meridian. East of that meridian, in the same latitude, the winds become southerly, and in the Gulf of Guinea, south-southwesterly.

Gales and Calms.—With the approach of winter, there has been a moderate increase in the percentage of gales north of the 35th parallel, except near the Azores, where it is less than during October.

Gales are infrequent south of latitude 35° N., and only seventeen West India hurricanes have been observed during the 39-year period 1887 to 1925.

Calms are of highest percentage between the 5th and 10th parallels and northward along the African coast to the Canary Islands.

Fog.—The percentage of fog has diminished generally since October, although the area of highest percentage, 30 to 35 per cent of days, continues to the southeast of Newfoundland with little change. A light increase has occurred in the English Channel.

2 KEY TO THE NOVEMBER STORM TRACKS AS SHOWN UPON THIS CHART

No.DatesBegins near—

°

°

IOct. 24-Nov. 2, 191241 N.75 W.
IINov. 12–20, 19121280
III 19–21, 19124057
IV 6–10, 19135345
V 12–15, 19161180
VI 18–19, 19192278
VII 16–19, 19202486
VIII 28-Dec. 2, 19203480
IX 10–13, 19214068
X 9–14, 19241977
XI 10–12, 19244047
XII 5–7, 19254337

Tracks of other and older storms than those shown on this chart were published in previous editions. Positions given are at Greenwich mean noon.

ICE CONDITIONS