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Supercooled Liquid Water Structure of a Shallow Orographic Cloud System in Southern Utah

Robert M. RauberDepartment of Atmospheric Science, Colorado State University, Fort Collins, CO 80523

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Lewis O. GrantDepartment of Atmospheric Science, Colorado State University, Fort Collins, CO 80523

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Abstract

A case study of an orographic cloud system that developed over the mountains or southern Utah is presented. The storm system contained supercooled liquid water over several hours, and produced almost no precipitation. Because of the high liquid water content, low ice particle concentrations, minimal precipitation, and long duration, the storm appears to have been a good candidate for seeding to augment precipitation. A preliminary analysis of the climatological frequency of orographic cloud systems over these mountains is discussed.

Abstract

A case study of an orographic cloud system that developed over the mountains or southern Utah is presented. The storm system contained supercooled liquid water over several hours, and produced almost no precipitation. Because of the high liquid water content, low ice particle concentrations, minimal precipitation, and long duration, the storm appears to have been a good candidate for seeding to augment precipitation. A preliminary analysis of the climatological frequency of orographic cloud systems over these mountains is discussed.

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