Glossary test

the movement of air in a horizontal direction

fog which forms when warmer

a very large mass of air in the atmosphere in which the temperature is almost constant and which is divided from another mass by a front

referring to a warm flow of air travel¬ling up a hillside or mountainside

a wind current, caused by solar heating of the land, that rises up a southfacing mountainside

A front at which the warm air is ascending the frontal surface up to high altitudes

Development or intensification of a high-pressure center

a cloud, usually a large dark thundercloud, which has the shape of an anvil

A lightning discharge occurring within the anvil of a thunderstorm, characterized by one or more channels that appear to crawl along the underside of the anvil

a mixture of gases in a mass surrounding the earth

scale from 1 to12 used to refer to the strength of wind

a mass of water vapour or ice particles in the sky that can produce rain

the bottom part of a layer of cloud

the height above the ground or water of the base of the lowest layer of cloud

a collection of different cloud types which have similarities

an advancing mass of cold air, moving under and lifting warmer air

the process by which hot air rises and cool air descends

clouds formed as a result of warm moist air rising and condensing at altitude

the fact of coming together at a particular point

weather which is not hot, warm nor very cold

a system of winds rotating inwards to an area of low barometric pressure

an area of low atmospheric pressure

the temperature at which air is saturated with water vapour and condensation begins

In meteorology, refers to the daily pattern of winds and temperatures

A strong downward rush of air which produces a blast of damaging wind on or close to the surface

A small but rapidly rotating column of wind of short duration that is made visible by dust, sand, and debris picked up from the ground

A rotating column of air rendered visible by dust

condensed water vapour in cloud-like masses lying close to the ground and limiting visibility

the forward part or surface. The line that separates warm and cold front

an area of low pressure found together with a weather front

a series of rain-bearing changes in the weather

a deposit of very small ice crystals formed when water vapour condenses at a temperature below freezing

a very strong wind usually blowing from a single direction

the rate at which a quantity such as temperature or pressure changes relative to change in a given variable, especially distance

a strong, sudden rush of wind

precipitation as small pellets of ice

a storm, where the precipitation is hail instead of rain or snow

dust or smoke in the atmosphere

a measurement of how much water vapour is contained in the air

frozen water

The tendency for air parcels to accelerate when they are displaced from their original position

an atmospheric phenomenon where cold air is nearer the ground than warm air

a line on a weather chart joining points of equal atmospheric pressure

referring to or showing isobars

a band of strong winds at high altitude

referring to a cold flow of air travelling down hillsides or mountainsides

a wind which occurs when the air in contact with the slope of a hill is cooled to a temperature lower than that in the free atmosphere, causing it to sink

a unit of speed equal to one nautical mile per hour, approximately 1.85 kilometres or 1.15 statute miles per hour

a powerful and sudden electrical discharge from a cloud

the hitting of something by a discharge of lightning

a wind blowing from the sea

aviation routine weather report

a chart of part of the Earth’s surface with information about weather conditions

a description of the weather in a given area

a science which studies weather and weather conditions

a particularly strong windshear especially associated with thunderstorms

visible water vapour, in the form of very fine droplets, in the atmosphere

a weather front created when air is forced upward from the Earth’s surface, as when a cold front overtakes and undercuts a warm front

the forcing of air upward from the Earth’s surface, as when a cold front overtakes and undercuts a warm front

water falling as rain, drizzle, hail, sleet and snow from the atmosphere onto the surface of the Earth

force applied uniformly over a surface, measured as force per unit of area

precipitation or water which falls from clouds in small drops

heavy rain accompanied by wind

the ratio between the amount of water vapour in the air and the amount which would be present if the air was saturated, at the same temperature and the same pressure

a long zone of relatively high atmospheric pressure

ice formed when individual droplets of water freeze rapidly on striking the aircraft surface

cloud created in the rotor zone on the downwind side of mountain ranges

a short period of rain or snow

melting snow or a mixture of rain and snow falling together

atmospheric water vapour frozen into ice crystals and falling to Earth as white flakes

a quantity of snow which comes down at any one time

a small piece of snow formed from a number of ice crystals

a heavy fall of snow accompanied by wind

a sudden increase in wind speed lasting for several minutes

Air that is colder than its surroundings and as such is resistant to upward movement

a violent weather disturbance with high winds and rain or snow

transformation directly from the solid to the gaseous state or from the gaseous to the solid state without becoming a liquid

a measurement, in degrees, of the intensity of heat of a body

the noise created by the violent expansion and contraction of air momentarily heated by a lightning discharge

a violent weather condition in which wind speeds increase, rain or hail falls and there is lightning activity

a violent storm of small extent, with rotating winds

a violent wind system which forms over tropical oceans

the level at which the troposphere and the stratosphere meet

an irregular motion of the atmosphere

a rising current of air

the gaseous form of a liquid

the ability to see unlighted objects by day and lighted objects by night, subject to atmospheric conditions

cyclonic flow in a relative small area

an advancing mass of warm air moving over a mass of cooler air

horizontal movement of air in relation to the Earths surface

a natural movement of air at a velocity relative to the surface of earth

a change in wind direction and speed between slightly different altitudes