Weather Definitions Ipsum

Word Lists: Weather Definitions

Copied Text to Buffer
Anemometer: an instrument that measures the speed or force of the wind. carbon dioxide (co2): a heavy, colorless gas that is the fourth most abundant constituent of dry air, comprising 0.033% of the total. ceiling: the lowest cloud layer that is reported as broken or overcast. if the sky is totally obscured, then it is the height of the vertical visibility. constant pressure chart: a chart of a constant pressure surface in which atmospheric pressure is uniform everywhere at any given moment. elements may include analyses of height above sea level, wind, temperature, and humidity. constant pressure surface: a surface along which the atmospheric pressure is equal everywhere. gale warning: a warning for marine interests for impending winds from 28 to 47 knots (32 to 54 miles per hour). horizon: one of several lines or planes used as reference for observation and measurement relative to a given location on the surface of the earth. the geographic horizon, also called the apparent horizon, is the distant line along which earth and sky appear to meet. this is the usual concept of horizon and is used in weather observing. the local horizon is the actual lower boundary of the observed sky or the upper outline of terrestrial objects including nearby natural obstructions, such as mountains. ice storm: a severe weather condition characterized by falling freezing precipitation. such a storm forms a glaze on objects, creating hazardous travel conditions and utility problems. low level jet (llj): strong winds that are concentrated in relatively narrow bands in the lower part of the atmosphere. it is often amplified at night. the southerly wind over the us plains states during spring and summer is a notable example. maritime air mass: an air mass influenced by the sea. it is a secondary characteristic of an air mass classification, signified by the small "m" before the primary characteristic, which is based on source region. for example, mp is an air mass that is maritime polar in nature. also known as a marine air mass. microbarograph: a instrument designed to continuously record a barometer's reading of very small changes in atmospheric pressure. middle clouds: a term used to signify clouds with bases between 6,000 and 18,000 feet. at the higher altitudes, they may also have some ice crystals, but they are composed mainly of water droplets. altocumulus, altostratus, and nimbostratus are the main types of middle clouds. this altitude applies to the temperate zone. in the polar regions, these clouds may be found at lower altitudes. in the tropics, the defining altitudes for cloud types are generally higher. north pacific high: a semi-permanent, subtropical area of high pressure in the north pacific ocean. it is strongest in the northern hemispheric summer and is displaced towards the equator during the winter when the aleutian low becomes more dominate. oxygen (o2): a colorless, tasteless, odorless gas that is the second most abundant constituent of dry air, comprising 20.946%. plow/plough wind: the spreading downdraft and strong straight-line winds preceding a thunderstorm. so named in the american midwest because of its ability to flatten tall grasses as it passes. prevailing wind: a wind that blows from one direction more frequently than any other during a given period, such as a day, month, season, or year. short wave: a progressive wave of smaller amplitude, wave length, and duration than a long wave. it moves in the same direction as the basic current in which it is embedded and may induce upward vertical motion ahead of it. they are more numerous than long waves and often disappear with height in the atmosphere. stable/stability: occurs when a rising air parcel becomes denser than the surrounding air. it will then return to its original position. when the density of the air parcel remains the same as the surrounding air after being lifted, it is also considered stable, since it does not have the tendency to rise or sink further. contrast with unstable air and instability. steam fog: a type of advection fog that is produced by evaporation when cool air passes over a warm wet surface and the fog rises, giving the appearance of steam. also called sea smoke when it occurs over the ocean. supercell: a severe thunderstorm characterized by a rotating, long-lived, intense updraft. although not very common, they produce a relatively large amount of severe weather, in particular, extremely large hail, damaging straight-line winds, and practically all violent tornadoes. thermohaline: in oceanography, it pertains to when both temperature and salinity act together. an example is thermohaline circulation which is vertical circulation induced by surface cooling, which causes convective overturning and consequent mixing. thickness: the thickness of a layer in the atmosphere is proportional to the mean temperature of that whole layer. the layer most often used in meteorology is between 1000 and 500 millibars. there can be different temperature profiles in the lowest layer of the atmosphere with the same 1000-500 millibar thickness value, depending on what is happening above that lowest layer. for example, if the lower levels are warming but higher levels are cooling, the overall mean temperature, the thickness, could remain the same. likewise, on a sunny day, the amount of incoming solar radiation, affects the temperature right at the earth's surface, without necessarily having much effect on the thickness of the whole layer..

Altocumulus castellanus: a middle cloud with vertical development that forms from altocumulus clouds. it is composed primarily of ice crystals in its higher portions and characterized by its turrets, protuberances, or crenelated tops. its formation indicates instability and turbulence at the altitudes of occurrence. conduction: the transfer of heat through a substance by molecular action or from one substance by being in contact with another. downburst: a severe localized downdraft from a thunderstorm or shower. this outward burst of cool or colder air creates damaging winds at or near the surface. sometimes the damage resembles tornadic damage. evapotranspiration: the total amount of water that is transferred from the earth's surface to the atmosphere. it is made up of the evaporation of liquid or solid water plus the transpiration from plants. forecast: a statement of expected future occurrences. weather forecasting includes the use of objective models based on certain atmospheric parameters, along with the skill and experience of a meteorologist. gully washer: a heavy rain shower that occurs suddenly, possibly creating a flash flood. humidity: the amount of water vapor in the air. it is often confused with relative humidity or dew point. hydrologic cycle: often called the water cycle, it is the vertical and horizontal transport of water in all its states between the earth, the atmosphere, and the seas. isotach: a line connecting equal wind speeds. isotherm: the line of equal or constant air temperature. if something is isothermal, it is of equal or constant temperature with respect to either time or space. : : microbarograph: a instrument designed to continuously record a barometer's reading of very small changes in atmospheric pressure. rotor cloud: an altocumulus cloud formation that can be found in the lee of a mountain or similar barrier. the air rotates around a horizontal axis, creating turbulence. altocumulus lenticularis is an example. triple point: the point at which any three atmospheric boundaries meet. it is most often used to refer to the point of occlusion of an extratropical cyclone where the cold, warm, and occluded fronts meet. cyclogenesis may occur at a triple point. it is also the condition of temperature and pressure under which the gaseous, liquid, and solid forms of a substance can exist in equilibrium. typhoon: the name for a tropical cyclone with sustained winds of 74 miles per hour (65 knots) or greater in the western north pacific ocean. this same tropical cyclone is known as a hurricane in the eastern north pacific and north atlantic ocean, and as a cyclone in the indian ocean.: : x-rays: the portion of the electromagnetic spectrum that has a very short wave length. it has a wave length longer than gamma rays, yet shorter than visible light. x-rays can penetrate various thicknesses of all solids, and when absorbed by a gas, can result in ionization. : :.

Air pollution: the soiling of the atmosphere by contaminants to the point that may cause injury to health, property, plant, or animal life, or prevent the use and enjoyment of the outdoors. altitude: in meteorology, the measure of a height of an airborne object in respect to a constant pressure surface or above mean sea level. antarctic ocean: although not officially recognized as a separate ocean body, it is commonly applied to those portions of the atlantic, pacific, and indian oceans that reach the antarctic continent on their southern extremes. buys ballot's law: describes the relationship of the horizontal wind direction to the pressure distribution. in the northern hemisphere, if one stands with one's back to the wind, the pressure on one's left is lower than the pressure on one's right. it is reversed in the southern hemisphere. this law was named after the dutch meteorologist, buys ballot, who developed the formula in 1857. ceilometer: an instrument that is used to measure the angular elevation of a projected light on the base of a cloud. it measures the angle of the cloud base included by the observer (or machine), the ceiling light and the illuminated spot on the cloud. jet stream: an area of strong winds that are concentrated in a relatively narrow band in the upper troposphere of the middle latitudes and subtropical regions of the northern and southern hemispheres. flowing in a semi-continuous band around the globe from west to east, it is caused by the changes in air temperature where the cold polar air moving towards the equator meets the warmer equatorial air moving polarward. it is marked by a concentration of isotherms and strong vertical shear. low clouds: a term used to signify clouds with bases below 6,000 feet and are of a stratiform or a cumuliform variety. stratiform clouds include stratus and stratocumulus. cumuliform clouds include cumulus and cumulonimbus. this altitude applies to the temperate zone. in the polar regions, these clouds may be found at lower altitudes. in the tropics, the defining altitudes for cloud types are generally higher. metar: acronym for meteorological aerodrome report. it is the primary observation code used in the united states to satisfy requirements for reporting surface meteorological data. minimum reporting requirements includes wind, visibility, runway visual range, present weather, sky condition, temperature, dew point, and altimeter setting. microburst: a severe localized wind blasting down from a thunderstorm. it covers an area less than 2.5 miles (4 kilometers) in diameter and is of short duration, usually less than 5 minutes. multicell storm: a thunderstorm made up of two or more single-cell storms. nautical twilight: the time after civil twilight, when the brighter stars used for celestial navigation have appeared and the horizon may still be seen. it ends when the center of the sun is 12 degrees below the horizon, and it is too difficult to perceive the horizon, preventing accurate sighting of stars. snow crust: the crisp, almost icy, surface on fallen snow, usually formed by the slight melting and refreezing of the surface snow. snow squall: a heavy snow shower accompanied by sudden strong winds, or a squall. thermometer: an instrument used for measuring temperature. the different scales used in meteorology are celsius, fahrenheit, and kelvin or absolute. trace: generally, an unmeasurable or insignificant quantity. a precipitation amount of less than 0.005 inch. tsunami: an ocean wave with a long period that is formed by an underwater earthquake or landslide, or volcanic eruption. it may travel unnoticed across the ocean for thousands of miles from its point of origin and builds up to great heights over shallower water. also known as a seismic sea wave, and incorrectly, as a tidal wave. yellow snow: snow that is given golden, or yellow, appearance by the presence of pine or cypress pollen in it. : :.
Generate New Ipsum
All your ipsum are belong to us