Sand Key 1,813 



Southeast Farallon 31 



Tatoosh Island 2,459 



WEATHER BUREAU. 287 



The following is the number of vessels reported by each vessel - 

 reporting station during the year: 



Block Island 5 



Cape Henry 19,876 



North Head 1,619 



Point Reyes Light 1,206 



Port Crescent 622 ToUU 27,631 



CLIMATOLOGICAL DIVISION. 



METEOROLOGICAL AND CLIMATOLOGICAL REPORTS. 



The Annual Report of the Chief of the Weather Bureau for 

 1910-11 was prepared and printed, as were also the regular issues 

 of the Monthly Weather Review. The demand for the separates of 

 the Review has continued to increase, the edition of the several parts 

 now amounting to 14,729 each month. 



The issue of the National Weather Bulletin weekly during the 

 crop-growing season and monthly during the remainder of the year 

 continued as in past years. The demand for this bulletin has likewise 

 shown a healthy increase, the edition now exceeding 4,000 copies. 



The snow and ice bulletins issued during the past winter were of 

 uncommon interest on account of the severe cold and the unusual 

 amount of ice reported on the lakes and rivers. In view of this con- 

 dition it was found advisable to continue its issue until the first week 

 in April. Likewise the special report issued at Detroit during the 

 early spring as to the condition of the ice on the Great Lakes was 

 continued until the latter part of April because of the unusually late 

 date at which the ice broke up. 



Snow bulletins for the Mountain States of the Far West were issued 

 as in the past, additional eft'ort being made to show the snow condi- 

 tion in more detail as a basis for forecasting the season's available 

 water supply for irrigation and other purposes. 



The monthly climatological reports and weekly bulletins for the 

 Territories of Hawaii and Porto Rico, and for the State of Iowa In 

 conjunction with the weather service of that State, were issued as 

 usual. To meet the demands for prompt information as to the 

 month's weather, especially the rainfall, several other section centers 

 were authorized to print and distribute condensed monthly sum- 

 maries for their States as early as possible. Annual summaries of the 

 44 sections were also published in full, and form a valuable addition 

 to the series already issued. 



Considerable work has been accomplished in the preparation of 

 data for a bulletin on the winds of the United States, which it is 

 hoped to complete before the end of the coming year. 



During the year there has been a further increase in the number 

 of requests for data, embracing all features of climate and coming 

 from all portions of the United States as well as from many foreign 

 countries. These requests were all promptly complied with as far as 

 possible. 



COOPERATIVE METEOROLOGICAL STATIONS. 



Cooperative stations to the number of about 4,200 are now in suc- 

 cessful operation, covering nearly every important locality in the 

 United States and furnishing data by which to establish accurately 

 the essential features of the climate of the districts represented. Now 



