NOTE.—Contains, on reverse, Prevailing direction of wind on Great Lakes during December, with percentages, 1900-09.—Average depth of snow on ground and average thickness of ice in harbors, etc., in inches, during December, 1900-11.—Approximate location of submarine signal bell stations, March, 1911.—Distribution of radio [or] wireless telegraph stations on Great Lakes, and call letters for each.—Total amount of snow, in inches, un melted, during December, 1900-11.—Highest velocity of wind, direction from which coming, and date of occurrence, during December, 1900-11.
The meteorological charts and supplements of the north Atlantic, north Pacific, and Indian oceans, and the Great Lakes, monthly, and of the south Atlantic and south Pacific oceans, quarterly, are issued by the Weather Bureau for gratuitous distribution to cooperating shipmasters and others interested in ocean meteorology.