. Kompendium der Meteorologie. Meteorologie. Abb. 3.- Radarscope Foto des Säens, Oktober 5, 1948, L-förmige Bereich zeigen von Licht regen. In nur geringen Niederschlagsmengen und in dis geeignet - sipation nur wenn die Wolken brachen aufgrund der natürlichen Bedingungen. Eine Studie der Ohio Bericht zeigt an, ohne Ausnahme, dass solche. Abb. 4. - Erste Ausgangspunktebereich ab 10.000 ft über Cloud Deck gesehen, dreißig Minuten fotografiert nach Aussaat (5. Oktober 1948). Hinweis natürlichen Pausen in Wolken. Große seeding Effekte, wie oben dargestellt, wurden nur möglich, wenn die Wolke

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. Compendium of meteorology. Meteorology. FiG. 3.—Radarscope photograph of seeding, October 5, 1948, showing L-shaped area of light rain. suited in only slight precipitation amounts and in dis- sipation only when the clouds were breaking up due to natural conditions. A study of the data presented in the Ohio report indicates without exception that such. Fig. 4.—First seeded area as seen from 10, 000 ft above cloud deck, photographed thirty minutes after seeding (October 5, 1948). Note natural breaks in clouds. large-scale seeding effects, as illustrated above, were possible only when the cloud deck treated was under- going natural dissipative action. On the "unfavorable" days, seeding resulted in the production of narrow lines of ice crystals which did not diffuse through the super- cooled cloud deck. The Sierra Nevada tests were conducted for the purpose of evaluating the importance of dry-ice seeding in orographic type stratus clouds. It was felt that the clouds formed along the Sierra Nevada Range by the mechanical lifting of moist Pacific air would offer the most favorable conditions for seeding. The report for the Project's operations near Sacramento [6] indicates that its seeding results were no more successful than those in Ohio [4]. First of all, it was found that non- frontal orographic clouds existed only a fraction of the time, and that the majority of cloud systems over the Sierra Nevada Range were of frontal origin and con- tained natural ice-crystal clouds before lower super- cooled decks were formed. On only three days during a two-month operational period was it possible to find nonfrontal clouds and, on each of these days, the lack of large-scale horizontal convergence in the general area resulted in somewhat broken cloud decks. A dis- cussion of the seeding of February 15, 1949, is in- cluded here since on this particular day fairly large- scale dissipation results were observed. An altocumulus deck extending from 9800 ft to 10, 650 ft

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