A means of avoiding winds associated with a tropical cyclone by taking into account the forecast track error of the National Weather Service over a 10 year period which is approximately 100 nm in 24 hours, 200 nm for 48 hours and 300 nm in 72 hours. The forecast track error is added to the 34 knot wind radii to compute the danger area. The wind radii may be found within Tropical Cyclone Forecast Advisory (TCM) forecasts.
- Browse Related Terms: 1-2-3 Rule, AGFS, Complex Gale/Storm, CWFA, Developing Gale/Storm, FA, FCST, FOUS, Grids, High Seas Forecast, Marine Zone, NSSFC, OFSHR, PROGGED, Radar Meteorology, RAFC, RAFS, Red Flag Warning, TAF, Valid Time, ZFP
A statistic that indicates the magnitude of flood which can be expected to occur on average with a frequency of once every 100 years at a given point or reach on a river. The 100-year flood is usually developed from a statistical distribution that is based on historical floods. This is also called a base flood.
- Browse Related Terms: 100-year Flood, 100-year Flood Plain, Base Flood, Channel Routing, DNSTRM, Flood Frequency Curve, Flood Plain, Flood routing, Floodway, Lag, Lakeshore Flood Advisory, Lakeshore Flood Watch, Lakeshore Flooding, routing, Travel Time
The flood plain that would be inundated in the event of a 100-year flood.
- Browse Related Terms: 100-year Flood, 100-year Flood Plain, Base Flood, Channel Routing, DNSTRM, Flood Frequency Curve, Flood Plain, Flood routing, Floodway, Lag, Lakeshore Flood Advisory, Lakeshore Flood Watch, Lakeshore Flooding, routing, Travel Time
Pressure surface (geopotential height) in the troposphere equivalent to about 18,000 feet above sea level. Level of the atmosphere at which half the mass of the atmosphere lies above and half below, as measured in pressure units. This area is important for understanding surface weather, upper air storms tend to be steered in the direction of the winds at this level and are highly correlated with surface weather.
- Browse Related Terms: 500 hPa, 500 mb, Constant Pressure Chart, Engineer's Level, Extraterrestrial Radiation, Isobaric Chart, Isoheight, Lithometeor, Precision, REP, Station pressure, Theodolite, Tides, Upper-air Weather Chart
Pressure surface (geopotential height) in the troposphere equivalent to about 18,000 feet above sea level. Level of the atmosphere at which half the mass of the atmosphere lies above and half below, as measured in pressure units. This area is important for understanding surface weather, upper air storms tend to be steered in the direction of the winds at this level and are highly correlated with surface weather.
- Browse Related Terms: 500 hPa, 500 mb, Constant Pressure Chart, Engineer's Level, Extraterrestrial Radiation, Isobaric Chart, Isoheight, Lithometeor, Precision, REP, Station pressure, Theodolite, Tides, Upper-air Weather Chart
Doppler Radar currently used nationwide by the National Weather Service.
- Browse Related Terms: 88D, AMVER/SEAS, Congressional Organic Act of 1890, NAVTEX Forecast, NOAA Weather Radio, NWR, NWSH, Pan Pan, S-Band Radar, Securite, SIGWX, Wind Waves, WX
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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- All > Science > Weather > Climate Change
An atmospheric condition that exists when the environmental lapse rate is greater than the dry adiabatic lapse rate.
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- All > Science > Weather > Climate Change
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