SOLAR RADIATION AND THE WEEKLY WEATHER 

 FORECAST OF THE ARGENTINE METEOR- 

 OLOGICAL SERVICE 



By GUILLERMO HOXMARK 



The Argentine Meteorological Service publishes every Wednesday 

 a weekly weather forecast, the forecast zone being the federal 

 capital (Buenos Aires) and the region of the River Plata. 



The prediction is issued in the form of a curve diagram wherein 

 exact values are given of temperature to be expected at 8 a. m. 

 and 8 p. m., for each day of the coming week. The rain forecast 

 is given in an accompanying note. 



This forecast was initiated during the Directorship of Mr. G. 

 Wiggin by Mr. H. H. Clayton, with the author as collaborator. 



The basis for the predictions, which began with December 12, 

 1918, was the measurements of solar radiation expressed in calories 

 per square centimeter per minute, transmitted by cable from the 

 Solar Observatory in Calama, Chile, maintained by the Smithsonian 

 Institution of Washington, D. C. The solar-radiation data have 

 also been used for more extensive investigations covering the whole 

 earth. Results of these researches have been presented in several 

 papers.^ 



Owing to unfavorable conditions, the solar-radiation measurements 

 were often discontinued during days and sometimes weeks, so that 

 it became necessary to find some other method of calculating solar 

 changes. 



^ Efifect of Short Period Variations of Solar Radiation on the Earth's At- 

 mosphere, by H. H. Clayton. Smithsonian Misc. Coll., Vol. 68, No. 3, 18 pp., 

 8 charts, 2 diagrams, Washington, D. C, .May, 1917; also in Spanish " Boletin 

 Mensual," Junio, 1916. Oficina Meteorologica Argentina. 



Variations in Solar Radiation and the Weather, by H. H. Clayton. Smith- 

 sonian Misc. Coll., Vol. 71, No. 3, 53 pp., 5 pis., 17 figs., Washington, D. C. 

 Jan. 15, 1920; and "Boletin Mensual," Febrero, 1918. Oficina Meteorologica 

 Argentina. 



La Maxima De La Radiation Solar En Enero Y Febrero De 1920. 



Y El Estado Del Tiempo Mundial, H. H. Clayton y Guillermo Hoxmark, 

 " Boletin Mensual," Junio, 1919, 18 pp., 9 figs., 2 cuadros. Oficina Meteorologica 

 Argentina (included in "World Weather" Chap. X). 



World Weather, by H. H. Clayton. 393 pp., 265 figs, and illustrations, 16 pis., 

 New York, 1923. 



Smithsonian Miscellaneous Collections, Vol. 77, No. 7 



