NOTE.—Contains on reverse, Highest velocity of wind, direction, and date of occurrence during May, 1900-11.—Total amount of snow in inches, unmelted during May, 1900-11.—Prevailing direction of wind on Great Lakes during May, with percentages, 1900-09.—Monthly mean temperature and departure from normal during May, 1907.— Distribution of wireless telegraph stations on Great Lakes, and call letters for each.— Approximate location of submarine signal bell stations, Mar. 1911.—Location of storm warning towers and flagstaffs.
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 sooth Pacific oceans, quarterly, are issued by the Weather Bureau for gratuitous distribution to cooperating shipmasters and others interested in ocean meteorology.