![]() ![]() Roll clouds, shelf clouds, and wall clouds are examples of accessory clouds. Accessory Cloud A cloud which is dependent on a larger cloud system for development and continuance. ACCAS clouds are a sign of instability aloft, and may precede the rapid development of thunderstorms. These clouds often are taller than they are wide, giving them a turret-shaped appearance. ACCAS (usually pronounced ACK-kis) - Alto Cumulus CAStellanus mid-level clouds (bases generally 8 to 15 thousand feet), of which at least a fraction of their upper parts show cumulus-type development. ![]() Abbreviation for Anticipated Convection the term originates from the header coding of the transmitted product. Convective outlook issued by the Storm Prediction Center. Abbreviation for Altocumulus - a cloud of a class characterized by globular masses or rolls in layers or patches, the individual elements being larger and darker than those of cirrocumulus and smaller than those of stratocumulus. Abutment Seeping Reservoir water that moves through seams or pores in the natural abutment material and exits as seepage. Right and left abutments are those on respective sides of an observer looking downstream. ![]() ABT About Abutment The part of a valley or canyon wall against which a dam is constructed. Absorption The process in which incident radiant energy is retained by a substance by conversion to some other form of energy. ABNDT Abundant Absolutely Stable Air An atmospheric condition that exists when the environmental lapse rate is less than the moist adiabatic lapse rate.Ībsolutely Unstable Air An atmospheric condition that exists when the environmental lapse rate is greater than the dry adiabatic lapse rate. AAAS American Association for the Advancement of Science AAWU Alaskan Aviation Weather Unit Ablation Depletion of snow and ice by melting and evaporation. A AMS Arctic Air Mass A Index A daily index of geomagnetic activity derived as the average of Symbol used on long-term climate outlooks issued by CPC to indicate areas that are likely to be above normal for the specified parameter (temperature, precipitation, etc.). Abbrevation for hail in weather observations.Ģ. NOAA's National Weather Service - GlossaryĪ 1. ![]()
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