ADAPTATION (ADAPTABLE) PARAMETERGenerally, data related to a specific WSR-88D unit. These data may consist of meteorological or hydrological parameters or of geographic boundaries, political boundaries, system configuration, telephone numbers (auto dial), or other like data. Such data may be generated at either a centralized location or locally at the WSR-88D unit. AIRMETAirman's Meteorological advisory (WA)AltimeterAn instrument that indicates the altitude of an object above a fixed level. Pressure altimeters use an aneroid barometer with a scale graduated in altitude instead of pressure.Altimeter SettingA correction of the station pressure to sea level used by aviation. This correction takes into account the standard variation of pressure with height and the influence of temperature variation with height on the pressure. The temperatures used correspond to the standard atmosphere temperatures between the surface and sea level. AnemometerAn instrument used for measuring the speed of the wind.Aneroid BarometerAn instrument for measuring atmospheric pressure in which a needle, attached to the top of an evacuated box, is deflected as changes in atmospheric pressure cause the top of the box to bend in or out.
API MethodIn hydrologic terms, a statistical method to estimate the amount of surface runoff which will occur from a basin from a given rainstorm based on the antecedent precipitation index, physical characteristics of the basin, time of year, storm duration, rainfall amount, and rainfall intensity. BarometerAn instrument that measures atmospheric pressure.Barometric PressureThe pressure of the atmosphere as indicated by a barometer.BathymetryThe science of measuring depths of the oceans, lakes, seas, etc.CeilometerA device using a laser or other light source to determine the height of a cloud base. An optical ceilometer uses triangulation to determine the height of a spot of light projected onto the base of the cloud; a laser ceilometer determines the height by measuring the time required for a pulse of light to be scattered back from the cloud base.Centimeter BurstA solar radio burst in the centimeter wavelength range.ClimometerAn instrument that measures angles of inclination; used to measure cloud ceiling heights.Current MeterIn hydrologic terms, device used to measure the water velocity or current in a river.
DisdrometerEquipment that measures and records the size distribution of raindrops. EvaporimeterIn hydrologic terms, an instrument which measures the evaporation rate of water into the atmosphere.HydrometeorologyAn interdisciplinary science involving the study and analysis of the interrelationships between the atmospheric and land phases of water as it moves through the hydrologic cycle.HydrometeorA particle of condensed water (liquid, snow, ice, graupel, hail) in the atmosphere.HydrometeorologistsIn hydrologic terms, individuals who have the combined knowledge in the fields of both meteorology and hydrology which enables them to study and
solve hydrologic problems where meteorology is a factor.HydrometeorologyAn interdisciplinary science involving the study and analysis of the interrelationships between the atmospheric and land phases of water as it moves through the hydrologic cycle.
HygrometerAn instrument which measures the humidity of the air.LithometeorAtmospheric phenomena which affect the state of the atmosphere. They constitute dry particles that hang suspended in the atmosphere, such as dust, smoke, sand, and haze. LysimeterIn hydrologic terms, a device to measure the quantity or rate of downward water movement through a block of soil usually undisturbed, or to collect
such percolated water for analysis as to qualityMercury BarometerAn instrument for measuring atmospheric pressure. The instrument contains an evacuated and graduated glass tube in which mercury rises or falls as the pressure of the atmosphere increases or decreases.MET1) Meteorological
2) MOS (Model Output Statistics) guidance based on Environmental Modeling Centers ETA modelMETARAn international code (Aviation Routine Weather Report) used for reporting, recording and transmitting weather observations.MeteogramA graphical depiction of trends in meteorological variables such as temperature, dew point, wind speed and direction, pressure, etc. The time series meteogram can be constructed using observed data or forecast data.Meteoric WaterWater derived from precipitation. Meteorological Model Ensemble River Forecast (MMEFS)An automated short-term hydrologic ensemble forecast system which utilizes temperature and precipitation output from the National Centers for Environmental Prediction (NCEP) GEFS and NAEFS meteorological models as inputs to River Forecast Center hydrologic models.MeteorologistA person who studies meteorology. There are many different paths within the field of meteorology. For example, one could be a research meteorologist, radar meteorologist, climatologist, or operational meteorologist. MeteorologyThe science dealing with the atmosphere and its phenomena. A distinction can be drawn between meteorology and climatology, the latter being primarily concerned with average, not actual, weather conditions.METROMetropolitanNavigation MethodsIn hydrologic terms, there are three basic methods of providing and managing inland waterways -
1) Run-of-the-River: no provision of upstream storage;
Slack-Water: locks and dams provide slack water or pools with adequate depth for the draft of heavy barges and area to prevent
3) Canalization: in lieu of a series of dams on the river a canal with locks adjoins the river.ParameterA subset of the group of evaluations that constitute each element of an observation.PermeameterIn hydrologic terms, a laboratory instrument for determining permeability by measuring the discharge through a sample of the material when a known
hydraulic head is applied.PhiezometerIn hydrologic terms, an instrument used to measure pressure head in a conduit, tank, soil, etc. They are used in dams to measure the level of saturation.Pressure AltimeterAn aneroid barometer calibrated to indicate altitude in feet instead of units of pressure. It is read accurately only in a standard atmosphere and when the correct altimeter setting is used.PsychrometerAn instrument used to measure the water vapor content of the air; a hygrometer consisting essentially of two similar thermometers with the bulb of one being kept wet so that the cooling that results from evaporation makes it register a lower temperature than the dry one and with the difference between the readings constituting a measure of the dryness of the atmosphere Radar MeteorologyBranch of meteorology that uses radars for weather observations and forecasts.Riometer(Relative Ionospheric Opacity meter). A specially designed radio
receiver for continuous monitoring of cosmic noise. The
absorption of cosmic noise in the polar regions is very
sensitive to the solar low-energy cosmic ray fluxSIGMETSignificant Meteorological AdvisorySling PsychrometerAn instrument used to measure the water vapor content of the atmosphere in which wet and dry bulb thermometers are mounted on a frame connected to a handle at one end by means of a bearing or a length of chain. The psychrometer is whirled by hand to provide the necessary ventilation to evaporate water from the wet bulb.Symmetric Double EyeA concentrated ring of convection that develops outside the eye wall in symmetric, mature hurricanes. The ring then propagates inward and leads to a double-eye. Eventually, the inner eye wall dissipates while the outer intensifies and moves inward. ThermometerAn instrument for measuring air temperature.UKMETA medium-range (3 to 7 day) numerical weather prediction model operated by the United Kingdom METeorological Agency. It has a resolution of 75 kilometers and covers the entire northern hemisphere. Forecasters use this model along with the ECMWF and GFS in making their extended forecasts (3 to 7 days).Visible Infra-Red Imaging Radiometer (VIIRS)A medium-resolution sensor flown aboard the NOAA-20 and Suomi-NP satellites.
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