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<br />Bureau of Reclamation
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<br />TECHNICAL REPORT STANDARD TITLE PAGE
<br />3. RECIPIENT'S CATALOG NO.
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<br />1. REPORT NO.
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<br />VI
<br />4. TITLE AND SUBTITLE
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<br />Cascade Atmospheric Water Resources Program
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<br />S. REPORT DATE
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<br />May 1, 1975
<br />6. PERFORMING ORGANIZATION CODE
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<br />7. AUTHOR(S) Peter V. Hobbs, L.F. Radke, A.B.
<br />Fraser, J.D. Locatelli, C.E. Robertson, D.G.
<br />Atkinson, R.J. Farber, R.R. Weiss, R.C. Easter
<br />9, PERFORMING ORGANIZATION NAME AND ADDRESS
<br />Department of Ecology
<br />State of Washington
<br />Olympia, WA 98504
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<br />12. SPONSORING AGENCY NAME AND ADDRESS
<br />Engineering and Research Center
<br />Bureau of Reclamation
<br />Division of Atmospheric Water Resource Mngm't
<br />Denver, CO 80225
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<br />8. PERFORMING ORGANIZATION
<br />REPORT NO.
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<br />VI (same as Item 1)
<br />10. WORK UNIT NO.
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<br />11. CONTRACT OR GRANT NO.
<br />14-06-D-6999
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<br />13. TYPE OF REPORT AND PERIOD
<br />COVERED
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<br />Final
<br />Volume
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<br />of 3
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<br />14. SPONSORING AGENCY CODE
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<br />IS. SUPPLEMENTARY NOTES This document is a report on research conducted by the
<br />Cloud Physics Group, Atmospheric Sciences Dept., University of Washington,
<br />directed by Professor Peter V. Hobbs, and under subcontract to the ~tate of
<br />Washin ton De ar ment of Ecolo
<br />16. ABSTRACT
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<br />This report describes studies of winter cyclonic storms, orographic
<br />clouds, and precipitation over the Cascade Mountains of Washington State.
<br />During the July 1970-June 1971 period simultaneous airborne, ground and
<br />radar observations were made in a number of different synoptic situations,
<br />and investigations into the effects on clouds and precipitation of seeding
<br />with artificial ice nuclei were continued. Progress was also made in
<br />developing a theoretical model to describe the flow of air over the
<br />Cascade Mountains and the growth and fall-out of precipitation from
<br />orographic clouds.
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<br />17. KEY WORDS AND DOCUMENT ANALYSIS
<br />a. DESCRIPTORS-- artificial seeding, Cascade Mountains, cyclonic storms,
<br />orographic clouds, precipitation, snowfall, weatner
<br />mod i f icat ion
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<br />b. IDENTIF IERS--
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<br />Cascade Mountains - State of Washington
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<br />c. COSATI Field/Group
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<br />18. DISTRIBUTION STATEMENT
<br />Available from the National Technical Information Service, Operations
<br />Division, Springfield, Virginia 22151.
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<br />19. SECURITY CLASS.
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<br />UNCLASSIFIED
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<br />20. SECURITY CL.ASS
<br />(THIS PAGEl
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<br />UNCLASSIFIED
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<br />1. NO. OF PAGE
<br />306
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<br />22. PRICE
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<br />$3.00
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