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cyclical storage could be drawn in greater amounts without risking shortages to meet prior commitments. Storage water held in abeyance as governed under critical water conditions could be released ahead and the;reby fully utilized, instead of being wasted. Based on advance knowledge of resources, industry could schedule production and avoid abrupt curtail- ments 0 Flood Control - Water spilled to provide flood control could be conserved to generate power or to meet other conservation uses later. Flood plains could be profitably farmed and harvested during periods of forecasted low runoff. Pro- tective measures could be taken much time ahead during periods of forecasted high floods. Irrigation - Prior knowledge on runoff would modify the irrigated and non-irrigated cropping practice. Releases could be made to supplement water supply to lands now inadequately irrigated. Stored for irrigation, water could safely be released in advance when needed to provide addi- tional flood control space. Streamflow forecasting procedures described herein are an adap- tation of the methods of ultra long range weather forecasting, evolved during the last 25 years by the staff of the American Institute of Aerological Re- search. The work began at the California Institute of Technology where the author and his associates directed the activities of the Department of Mete- orology between 1933 and 1948. The method involves the discovery and analysis of systematic behavior features of globe-circling atmO'spheric pressure waves. The con- clusions reached are derived from an examination of historical weather data in the form of Northern Hemispheric daily surface weather charts on which the barometric pressure patterns are drawn. It has been found possible to classify into various categories sequential pressure patterns, representing fundamentally stable flow patterns in the atmosphere. These patterns are called weather types. The reality of such a classification confirms the ordered nature of atmospheric behavior and the fact that the wind systems have certain preferred positions in relation to the !!;eographic features of the earth's surface, and the terrestrial and extra-terrestrial forces pulsing the atmosphere. The catalog of weather types, prepared from an examination of the historical archive of Northern Hemispheric daily weather cha;rts, becomes a useful tool in fore- casting because it provides a meanS of n:>aking full use of historical data in - 16 -