Meteorology and atmospheric science terminology · MLC-0110

Meteorology and atmospheric science terms: V (64)

• V NotchA radar reflectivity signature seen as a V-shaped notch in the downwind part of a thunderstorm echo. The...
• VAACVolcanic Ash Advisory Centers
• VADVelocity Azimuth Display
• VAD wind profileA radar plot of horizontal winds, derived from VAD data, as a function of height above a Doppler Radar. The...
• vadose zoneThe locus of points just above the water table where soil pores may either contain air or water. This is also...
• VALDRIFTAn air pollution transport and diffusion model developed to determine pesticide drift from aerial spraying...
• Valid TimeThe period of time during which a forecast or warning, until it is updated or superseded by a new forecast...
• Valid Time Event Code(VTEC) - The Valid Time Event Code (VTEC) always is used in conjunction with, and provides supplementary...
• Valley Exit JetA strong elevated down-valley air current issuing from a valley above its intersection with the adjacent...
• Valley Volume EffectThe reduction in volume of a valley (or basin) as compared to an equal depth volume with a horizontal floor...
• ValveIn hydrologic terms, a device fitted to a pipeline or orifice in which the closure member is either rotated...
• vapor pressureThe partial pressure of water vapor in an air-water system.
• Variable Infiltration CapacityA large-scale, semi-distributed hydrologic model that solves full water and energy balances. As such, it...
• variable windSame as Variable Wind Direction; a condition when (1) the wind direction fluctuates by 60° or more during the...
• Variable Wind DirectionA condition when (1) the wind direction fluctuates by 60° or more during the 2-minute evaluation period and...
• varianceA measure of variability.
• VCNTYVicinity
• VCPVolume Coverage Pattern - A volumetric sampling procedure designed for the surveillance of one or more...
• veeringA clockwise shift in wind direction (for example, south winds shifting to the west).
• Veering WindsWinds which shift in a clockwise direction with time at a given location (e.g., from southerly to westerly)...
• Velocity Cross SectionThis WSR-88D radar product displays a vertical cross section of velocity on a grid with heights up to 70,000...
• Velocity ZonesIn hydrologic terms, areas within the floodplain subject to potential high damage from waves. These sometimes...
• velocity-azimuth displayA WSR 88-D product which shows the radar derived wind speeds at various heights. This radar product shows the...
• Ventilation IndexProduct of the mixing depth and transport wind speed, a measure of the potential of the atmosphere to...
• Venturi effectThe speedup of air through a constriction due to the pressure rise on the upwind side of the constriction and...
• Ver High FrequencyThat portion of the radio frequency spectrum from 30 to 300 MHz
• vertical velocityThe component of velocity (motion) in the vertical. The evaluation of areas of upward vertical velocity is...
• vertical wind shearthe change in the wind's direction and speed with height. This is a critical factor in determining whether...
• Vertically Stacked SystemA low-pressure system, usually a closed low or cutoff low, which is not tilted with height, i.e., located...
• very low frequencyThat portion of the radio frequency spectrum from 3 to 30 kHz
• Very Windy30 to 40 mph winds.
• VFRVisual Flight Rules
• VILVertically-Integrated Liquid water. A property computed by RADAP II and WSR-88D units that takes into account...
• VIPVideo Integrator and Processor, which contours radar reflectivity (in dBZ) into six VIP levels:
• VirgaStreaks or wisps of precipitation falling from a cloud but evaporating before reaching the ground. In certain...
• virtual potential temperatureThe virtual potential temperature is the temperature a parcel at a specific pressure level and virtual...
• virtual temperatureThe virtual temperature is the temperature a parcel which contains no moisture would have to equal the...
• VIS1. Visible satellite imagery
• visibilityThe distance at which a given standard object can be seen and identified with the unaided eye
• Visibility Protection ProgramThe program specified by the Clean Air Act to achieve a national goal of remedying existing impairments to...
• Visible Infra-Red Imaging RadiometerA medium-resolution sensor flown aboard the NOAA-20 and Suomi-NP satellites.
• Visible Satellite ImageryThis type of satellite imagery uses reflected sunlight (this is actually reflected solar radiation) to see...
• Visual SpectrumThe portion of the electromagnetic spectrum to which the eye is sensitive, i.e., light with wavelengths...
• VLCTYVelocity
• VLYValley
• VMDVolume median diameter. A statistical measure of the average droplet size in a spray cloud, such that fifty...
• VogVog, short for volcanic smog, is the haze formed by gas and fine particle emissions from volcanoes.
• Volcanic AshFine particles of mineral matter from a volcanic eruption which can be dispersed long distances by winds...
• volume scanA radar scanning strategy in which sweeps are made at successive antenna elevations (i.e., a tilt sequence)...
• Volume Velocity ProcessingA way to guess the large-scale 2-dimensional winds, divergence and fall speeds from one-dimensional radial...
• Voluntary Observing Ship Program(VOS) - An international voluntary marine observation program under the auspices of the World Meteorological...
• Vort MaxCommon slang reference to Vorticity Maximum; a center, or maximum, in the vorticity field of a fluid.
• VortexA whirling mass of air in the form of a column or spiral. It need not be oriented vertically but, for...
• VorticityA measure of the rotation of air in a horizontal plane. Positive (counter-clockwise or cyclonic) vorticity...
• VOS(Voluntary Observing Ship Program) - An international voluntary marine observation program under the auspices...
• VOTVorticity
• VRVeer
• VRT MOTNVertical motion
• VSBVisible Satellite Imagery
• VSBYVisibility
• VTEC(Valid Time Event Code) - The Valid Time Event Code (VTEC) always is used in conjunction with, and provides...
• VVPVolume Velocity Processing - a way to guess the large-scale 2-dimensional winds, divergence and fall speeds...
• VVSTORMModel-based convection algorithm.
• VWPVAD Wind Profile - a radar plot of horizontal winds, derived from VAD data, as a function of height above a...

64 of 3,164 terms in Meteorology and atmospheric science terminology (MLC-0110). Request the full dataset.