Meteorology and atmospheric science terminology · MLC-0110
Meteorology and atmospheric science terms: E (119)
- EEast
- E-19, Report on River Gage StationIn hydrologic terms, a report to be completed every 5 years providing a complete history of a river station...
- E-19a, Abridged Report on River Gage StaIn hydrologic terms, an abridged version of an E-19, an E-19a updates the E-19 as additional information, or...
- E-3, Flood Stage ReportIn hydrologic terms, a form that a Service Hydrologist/ Hydrology Focal Point completes to document the dates...
- E-5, Monthly Report of River and Flood cIn hydrologic terms, a monthly narrative report covering flooding which occurred over the past month. Flood...
- E-7, Flood Damage ReportIn hydrologic terms, a report to be completed anytime there is reported flood damage or loss of life as a...
- easterliesAny winds with components from the east.
- easterly waveA low level disturbance of tropical origins. Easterly waves can develop into tropical cyclones. However...
- ebb currentThe movement of a tidal current away form the coast or down an estuary.
- EBNDEastbound
- EBSEmergency Broadcast System
- EccentricityA dimensionless quantity describing the elliptical shape of a planet's orbit.
- echoEnergy back scattered from a target (precipitation, clouds, etc.) and received by and displayed on a radar...
- Echo TopsThe height above ground of the center of the radar beam using the tilt, or scan, that contains the highest...
- ECMFEuropean Center for Meteorology Forecast model.
- ECMWFEuropean Center for Medium-Range Weather Forecasts. Operational references in forecast discussions typically...
- eddySwirling currents of air at variance with the main current.
- EDTEastern Daylight Time
- EFCTEffect
- effective porosityIn hydrologic terms, the ratio, usually expressed as a percentage, of the volume of water or other liquid...
- effective precipitation1) That part of the precipitation that produces runoff.
- Effective Terrestrial RadiationThe difference between upwelling infrared or terrestrial radiation emitted from the earth and the downwelling...
- Effective TopographyThe topography as seen by an approaching flow, which may include not only the actual terrain but also cold...
- effluent seepageIn hydrologic terms, diffuse discharge of ground water to the ground surface
- effluent streamIn hydrologic terms, any watercourse in which all, or a portion of the water volume came from the Phreatic...
- El NiñoA warming of the ocean current along the coasts of Peru and Ecuador that is generally associated with...
- elementOne of the basic conditions of the atmosphere discussed in this FMH (wind, visibility, runway visual range...
- ELEVElevation
- elevated convectionConvection occurring within an elevated layer, i.e., a layer in which the lowest portion is based above the...
- ELSWElsewhere
- ELYEasterly
- EmbankmentIn hydrologic terms, fill material, usually earth or rock, placed with sloping sides and usually with length...
- EMBDDEmbedded
- EMCEnvironmental Modeling Center
- Emergency Action PlanIn hydrologic terms, a predetermined plan of action to be taken to reduce the potential for property damage...
- Emergency ServicesIn hydrologic terms, services provided in order to minimize the impact of a flood that is already happening...
- Emerging Flux RegionIn solar-terrestrial terms, an area on the sun where new magnetic flux is erupting.
- emissivityThe ability of a surface to emit radiant energy compared to that of a black body at the same temperature and...
- EMLElevated Mixed Layer
- ENDGEnding
- Energy DissipatorIn hydrologic terms, a structure which slows fast-moving spillway flows in order to prevent erosion of the...
- Energy Helicity IndexAn index that incorporates vertical shear and instability, designed for the purpose of forecasting supercell...
- Engineer's LevelA telescope which is attached to a spirit-tube level, all revolving around a vertical axis and is mounted on...
- enhanced "vA pattern seen on satellite infrared photographs of thunderstorms, in which a thunderstorm anvil exhibits a...
- Enhanced Wording1. An option used by the SPC in tornado and severe thunderstorm watches when the potential for strong/violent...
- ENHNCDEnhanced
- ENSEMBLEA collection of numerical model results that show slightly different possible outcomes.
- ensemble forecastMultiple predictions from an ensemble of slightly different initial conditions and/or various versions of...
- Ensemble Hydrologic ForecastingIn hydrologic terms, a process whereby a continuous hydrologic model is successively executed several times...
- EnsemblesReference to a set of computer models run under the concept of Ensemble Forecasting: multiple predictions...
- ENSOAbbreviation for El Niño-Southern Oscillation, a reference to the state of the Southern Oscillation.
- ENSO Diagnostic DiscussionThe CPC issues the ENSO Diagnostic Discussion around the middle of the month. The discussion addresses the...
- ENTREntire
- entrainment zoneA shallow region at the top of a convective boundary layer where fluid is entrained into the growing boundary...
- entrance regionThe region upstream from a wind speed maximum in a jet stream (jet max), in which air is approaching...
- entropyThe amount of energy that is not available for work during a certain process.
- Environment CanadaThe Canadian federal government department responsible for issuing weather forecasts and weather warnings in...
- environmental lapse rateThe rate of decrease of air temperature with height, usually measured with a radiosonde.
- Environmental Temperature SoundingAn instantaneous or near-instantaneous sounding of temperature as a function of height. This sounding or...
- EPAEnvironmental Protection Agency
- EPCTGExpecting
- EPVEquivalent Potential Vorticity
- equilibrium drawdownIn hydrologic terms, the ultimate, constant drawdown for a steady rate of pumped discharge.
- Equilibrium Level(EL) - On a sounding, the level above the level of free convection (LFC) at which the temperature of a rising...
- Equilibrium Surface DischargeIn hydrologic terms, the steady rate of surface discharge which results from a long-continued, steady rate of...
- Equilibrium TimeIn hydrologic terms, the time when flow conditions become substantially equal to those corresponding to...
- equinoxThe time when the sun crosses the earth's equator, making night and day of approximately equal length all...
- Equi-Potential LineIn hydrologic terms, a line, in a field of flow, such that the total head is the same for all points on the...
- equivalent potential temperatureThe equivalent potential temperature is the temperature a parcel at a specific pressure level and temperature...
- E-regionIn solar-terrestrial terms, a daytime layer of the earth's ionosphere roughly between the altitudes of 85 and...
- ERLYEarly
- ERNEastern
- erosionIn hydrologic terms, wearing away of the lands by running water, glaciers,winds, and waves, can be subdivided...
- EruptiveIn solar-terrestrial terms, solar activity levels with at least one radio event (10 cm) and several...
- Eruptive Prominence on LimbIn solar-terrestrial terms, a solar prominence that becomes activa- ted and is seen to ascend from the sun.
- ESPExtended Streamflow Prediction
- ESTEastern Standard Time
- estuaryIn hydrologic terms, the thin zone along a coastline where freshwater systems and rivers meet and mix with a...
- Esturine watersIn hydrologic terms, deepwater tidal habitats and tidal wetlands that are usually enclosed by land but have...
- Esturine ZoneIn hydrologic terms, the area near the coastline that consists of esturaries and coastal saltwater wetlands
- ETA1. The Eta Model, now referred to as North Amercian Meso (NAM) an 84-hour numerical model of the atmosphere...
- Eta ModelNow referred to as North Amercian Meso (NAM) is one of the operational numerical forecast models run at NCEP...
- EvaporationThe process of a liquid changing into a vapor or gas, usually water in meteorology.
- evaporation panIn hydrologic terms, a pan used to hold water during observations for the determination of the quantity of...
- evaporation rateIn hydrologic terms, the quantity of water, expressed in terms of depth of liquid water, which is evaporated...
- Evaporation-mixing FogFog that forms when the evaporation of water raises the dew point of the adjacent air.
- Evaporative Demand Drought IndexAn experimental drought monitoring and early warning guidance tool. It examines how anomalous the atmospheric...
- evaporimeterIn hydrologic terms, an instrument which measures the evaporation rate of water into the atmosphere.
- EvapotranspirationCombination of evaporation from free water surfaces and transpiration of water from plant surfaces to the...
- EVEEvening
- EWDEastward
- EWWExtreme Wind Warning (EWW) inform the public of the need to take immediate shelter in an interior portion of...
- excess rainIn hydrologic terms, effective rainfall in excess of infiltration capacity.
- Excessive Rainfall OutlookA graphical product in which the Weather Prediction Center (WPC) forecasts the probability that rainfall will...
- EXCLDExclude
- Exclusive Flood Control Storage CapacityIn hydrologic terms, the space in a reservoir reserved for the sole purpose of regulating flood inflows to...
- exit regionThe region downstream from a wind speed maximum in a jet stream (jet max), in which air is moving away from...
- exosphereThe upper most layer of the earth's atmosphere; the only layer where atmospheric gases can escape into outer...
- Experimental ProductAn experimental product is in the final stages of testing and evaluation. If the product proves accurate and...
- Explosive DeepeningA decrease in the minimum sea-level pressure of a tropical cyclone of 2.5 mb/hr for at least 12 hours or 5...
- EXTDExtend/Extended
- Extended Forecast DiscussionThis discussion is issued once a day around 2 PM EST (3 PM EDT) and is primarily intended to provide insight...
- extraterrestrial radiationThe theoretically-calculated radiation flux from the sun at the top of the atmosphere, before losses by...
- extratropicalA term used in advisories and tropical summaries to indicate that a cyclone has lost its "tropical"...
- extratropical cycloneA cyclone in the middle and high latitudes often being 2000 kilometers in diameter and usually containing a...
- Extratropical LowA low pressure center which refers to a migratory frontal cyclone of middle and higher latitudes. Tropical...
- Extreme ColdExtreme Cold: A period of abnormally cold and dangerous temperatures or wind chills that can result in...
- Extreme Cold WarningThis product is issued when dangerously cold air temperatures or wind chill values are expected or occurring...
- Extreme Cold WatchThis product is issued when an extreme cold event is possible, but its occurrence, location, and/or timing is...
- Extreme HeatA period of abnormally hot and dangerous temperatures, with or without high humidities, that can result in...
- Extreme Heat WarningThis product is issued by the National Weather Service when extremely dangerous heat is expected or...
- Extreme Heat WatchThis product is issued when conditions are favorable for an extreme heat event but its occurrence, location...
- Extreme UltravioletA portion of the electromagnetic spectrum from approximately 100 to 1000 angstroms.
- Extreme Wind WarningExtreme Wind Warning (EWW) inform the public of the need to take immediate shelter in an interior portion of...
- extremely low frequencyThat portion of the radio frequency spectrum from 30 to 3000 hertz
- EXTRMExtreme
- EXTSVExtensive
- eyeThe relatively calm center in a hurricane that is more than one half surrounded by wall cloud. The winds are...
- Eye WallIt is an organized band of cumuliform clouds that immediately surrounds the center (eye) of a hurricane. The...
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