It is total or reservoir capacity minus inactive storage capacity.
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Active Storage Capacity In hydrologic terms, the total amount of reservoir capacity normally available for release from a reservoir below the maximum storage level.
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Active Region (AR) In solar-terrestrial terms, a localized, transient volume of the solar atmosphere in which plages, sunspots, faculae, flares, etc. Active Prominence Region (APR) In solar-terrestrial terms, a portion of the solar limb displaying active prominences. In appearance over a few minutes of time. Active Prominence In solar-terrestrial terms, a prominence displaying material motion and changes Active Longitude In solar-terrestrial terms, the approximate center of a range of heliographic longitudes in which Active Regions are more numerous and more flare-active than the average. Active Dark Filament (ADF) In solar-terrestrial terms, an Active Prominence seen on the Disk. Conservation storage is the volume of water stored between the inactive pool elevation and flood control stage. Several larger radio events (10cm) per day (Class M Flares) Active Conservation Storage In hydrologic terms, the portion of water stored in a reservoir that can be released for all useful purposes such as municipal water supply, power, irrigation, recreation, fish, wildlife, etc. In solar-terrestrial terms, solar activity levels with at least one geophysical event or Action stage can be the same as forecast issuance stage (see / forecast issuance stage/). The appropriate action is usually defined in a weather forecast office (WFO) hydrologic services manual.
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ACRS Across Action Stage The stage which, when reached by a rising stream, represents the level where the NWS or a partner/user needs to take some type of mitigation action in preparation for possible significant hydrologic activity. An acre-foot equals 326,851 gallons, or 43,560 cubic feet. ACLD Above Cloud Level ACPY Accompany Acre-foot The amount of water required to cover one acre to a depth of one foot. Acid Rain Rain containing relatively high concentrations of acid-forming chemicals that have been released into the atmosphere and combined with water vapor harmful to the environment. Acid Precipitation Precipitation, such as rain, snow or sleet, containing relatively high concentrations of acid-forming chemicals that have been released into the atmosphere and combined with water vapor harmful to the environment. ACCUMS accumulation Accuracy Degree of conformity of a measure to a standard or true value in other words, how close a predicted or measured value is to the true value. Accretion The growth of a precipitation particle by the collision of a frozen particle with a supercooled liquid water droplet which freezes upon impact. 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.
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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. NOAA's National Weather Service - Glossary AC 1.