1. Abbrevation for hail in weather observations.
2. 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.).
- Browse Related Terms: A, B, CL, Climate Diagnostics Bulletin, Climatological Outlook, Drought Assessments, ENSO Diagnostic Discussion, Hazards Assessment, OTLK, PWO, SWODY2
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Arctic Air Mass
- Browse Related Terms: A AMS, C AMS, CAD, Cold Air Avalanche, Cold Air Dam, Cold Air Damming (CAD), cold front, Continental Air Mass, Effective Topography, Extratropical, front, K AMS, Marine Push, Maritime Air Mass, Maritime Polar Air Mass, Maritime Tropical Air Mass, Orographic Precipitation, Polar Front, Specific Humidity, Upslope Fog, Vortex, Warm front
A daily index of geomagnetic activity derived as the average of the eight 3-hourly a indices.
- Browse Related Terms: A Index, AVG, Climate, Composite, Maximum Sustained Surface Wind, mean, Mean Annual Temperature, Meteorology, Rogue Wave, Significant wave height, Smoothed Sunspot Number, Sustained Wind
American Association for the Advancement of Science
- Browse Related Terms: AAAS, ADVN, Backfire, MAXT, Medium Range
Alaskan Aviation Weather Unit
- Browse Related Terms: AAWU, Few Clouds, Instrument Flight Rules, Marginal Visual Flight Rules, MVFR, OVC, overcast, Scattered, State Weather Roundup, TWEB, Widespread
Depletion of snow and ice by melting and evaporation.
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Abundant
- Browse Related Terms: ABNDT, Accuracy, BAM, Bathymetry, Climate change, Correlation, Dobson Unit, TEMP, Temperature, variance
An atmospheric condition that exists when the environmental lapse rate is less than the moist adiabatic lapse rate.
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An atmospheric condition that exists when the environmental lapse rate is greater than the dry adiabatic lapse rate.
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The process in which incident radiant energy is retained by a substance by conversion to some other form of energy.
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About
- Browse Related Terms: ABT, ABV, ACRS, AFT, AFTR, AGN, ALG, ALTHO, AMD, AOA, AOB, ARND, AVBL, BCM, BCMNG, BFR, BGN, BHND, BLO, BLV, BRF, BTR, BTWN, BYD, CFC, CHGS, CLR, DMSH, DURG, EBND, EFCT, ELSW, ENDG, ERLY, EXCLD, FASTST, FM, FTHR, GEN, GNRL, GRT, GRTST, GTR, HND, HV, HWVR, IMPT, INDC, LN, LRG, LTL, LTR, LTST, MDNGT, METRO, MISC, MISG, MNLY, MR, MSTLY, NBND, NEC, NIL, NLY, NMBR, NR, NWLY, NWRD, NWRN, NXT, OTR, OTRW, OVR, PCT, PRBLY, PSBL, PSBLY, QG, RIOGD, RTRD, RW, SBND, SEWD, SGFNT, SPCLY, SS-, Sun Dog, SVRL, SWWD, SXN, TDA, THRFTR, THRU, THRUT, TIL, TWD, WBND, WL, XCITED, YDA
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The part of a valley or canyon wall against which a dam is constructed. Right and left abutments are those on respective sides of an observer looking downstream.
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Reservoir water that moves through seams or pores in the natural abutment material and exits as seepage.
- Browse Related Terms: Abutment Seeping, Active Storage Capacity, Afterbay, Area-Capacity Curve, Bank Storage, Contents, Dead Storage, Density Current, Downstream Slope, Drought, Drought Index, Excess Rain, Flood Control Storage, Hydrologic Budget, Inactive Storage Capacity, Live Capacity, Maximum Spillway Discharge, Normal Water Surface Elevation, Outlet, Pool, Sediment Storage Capacity, Spring, Stilling basin, Surcharge Capacity, Winter Pool
Above
- Browse Related Terms: ABT, ABV, ACRS, AFT, AFTR, AGN, ALG, ALTHO, AMD, AOA, AOB, ARND, AVBL, BCM, BCMNG, BFR, BGN, BHND, BLO, BLV, BRF, BTR, BTWN, BYD, CFC, CHGS, CLR, DMSH, DURG, EBND, EFCT, ELSW, ENDG, ERLY, EXCLD, FASTST, FM, FTHR, GEN, GNRL, GRT, GRTST, GTR, HND, HV, HWVR, IMPT, INDC, LN, LRG, LTL, LTR, LTST, MDNGT, METRO, MISC, MISG, MNLY, MR, MSTLY, NBND, NEC, NIL, NLY, NMBR, NR, NWLY, NWRD, NWRN, NXT, OTR, OTRW, OVR, PCT, PRBLY, PSBL, PSBLY, QG, RIOGD, RTRD, RW, SBND, SEWD, SGFNT, SPCLY, SS-, Sun Dog, SVRL, SWWD, SXN, TDA, THRFTR, THRU, THRUT, TIL, TWD, WBND, WL, XCITED, YDA
1. 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. These clouds are of medium altitude, about 8000-20,000 ft (2400-6100 m).
2. Convective outlook issued by the Storm Prediction Center. Abbreviation for Anticipated Convection; the term originates from the header coding [ACUS1] of the transmitted product.
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(usually pronounced ACK-kis) - A lto C umulus CAS tellanus; mid-level clouds (bases generally 8 to 15 thousand feet), of which at least a fraction of their upper parts show cumulus-type development. These clouds often are taller than they are wide, giving them a turret-shaped appearance. ACCAS clouds are a sign of instability aloft, and may precede the rapid development of thunderstorms.
- Browse Related Terms: ACCAS, Cb, CBMAM, Cell, Congestus, Convection, CU, Cumuliform, Cumulus, Cumulus Buildups, Cumulus Congestus, DNS, Flanking Line, TCU, Towering Cumulus, Turkey Tower, Updraft
A cloud which is dependent on a larger cloud system for development and continuance. Roll clouds, shelf clouds, and wall clouds are examples of accessory clouds.
- Browse Related Terms: Accessory Cloud, ACLD, Anvil Rollover, Arcus, Barber Pole, Chinook Arch, Cloud Layer, Cloud Movement, Collar Cloud, Differential Motion, Drop-size Distribution, Eye Wall, Rain-free Base, Roll Cloud, Scud, Sea Breeze Convergence Zone, TOP, Unstable Air, Wall Cloud
The growth of a precipitation particle by the collision of a frozen particle with a supercooled liquid water droplet which freezes upon impact.
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accumulation
- Browse Related Terms: ACCUMS, FLRY, Flurries, SHRA, SHRAS, SHSN, SHWR, Snow Flurries, Snow Shower, SW
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.
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