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OOW > 14. Frontal Depressions > Flashcards

14. Frontal Depressions Flashcards

1
Q

Term

A

Definition

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2
Q

Frontal Depression

A

A low-pressure system with associated fronts, typically leading to various weather phenomena like rain and winds.

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3
Q

Cold Front

A

The leading edge of a cooler mass of air, replacing (at ground level) a warmer mass of air.

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4
Q

Warm Front

A

A transition zone where a warm air mass is replacing a cold air mass.

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5
Q

Occluded Front

A

A composite front produced by occlusion, where a cold front overtakes a warm front and lifts the warm air above the earth’s surface.

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6
Q

Stationary Front

A

A pair of air masses, neither of which is strong enough to replace the other.

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7
Q

Air Mass

A

A volume of air defined by its temperature and water vapor content.

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8
Q

Barometric Pressure

A

The pressure exerted by the atmosphere at a given point, related to weather forecasting.

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9
Q

Isobar

A

A line on a map connecting points of equal atmospheric pressure.

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10
Q

Cyclonic Activity

A

Weather phenomena associated with large scales of air mass movement around a central region of low atmospheric pressure.

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11
Q

Anticyclone

A

A weather phenomenon characterized by large-scale circulation of winds around a central region of high atmospheric pressure, clockwise in the Northern Hemisphere, counterclockwise in the Southern Hemisphere.

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12
Q

Jet Stream

A

A fast flowing, narrow air current found in the atmosphere around 10 kilometers above the surface of the Earth.

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13
Q

Weather Front

A

A boundary separating two masses of air of different densities, and is the principal cause of meteorological phenomena.

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14
Q

Tropopause

A

The boundary in the Earth’s atmosphere between the troposphere and the stratosphere.

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15
Q

Condensation

A

The process by which water vapor in the air is changed into liquid water.

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16
Q

Precipitation

A

Any form of water - liquid or solid - falling from the sky, such as rain, snow, sleet, or hail.

17
Q

Dew Point

A

The atmospheric temperature (varying according to pressure and humidity) below which water droplets begin to condense and dew can form.

18
Q

Vortex

A

A region within a fluid where the flow revolves around an axis line, which may be straight or curved.

19
Q

Coriolis Effect

A

The effect whereby a mass moving in a rotating system experiences a force acting perpendicular to the direction of motion and to the axis of rotation.

20
Q

Trough

A

An elongated region of relatively low atmospheric pressure, often associated with fronts.

21
Q

Ridge

A

An elongated area of relatively high atmospheric pressure, usually associated with high-pressure systems.

22
Q

Isotherm

A

A line on a map connecting points of equal temperature.

23
Q

Advection

A

The transfer of heat or matter by the flow of a fluid, especially horizontally in the atmosphere.

24
Q

Squall Line

A

A line of severe thunderstorms that can form along or ahead of a cold front.

25
Q

Stratus Cloud

A

A low-level cloud characterized by horizontal layering with a uniform base, which might cause light drizzle or mist.

26
Q

Cumulus Cloud

A

A type of cloud that is thick and white with a flat base and a top that often resembles the shape of a cauliflower and is associated with good weather.

27
Q

Cumulonimbus Cloud

A

A type of cumulus cloud that is tall, dense, and involved in thunderstorms and other intense weather.

28
Q

Stratosphere

A

The layer of the earth’s atmosphere above the troposphere, extending to about 50 km above the earth’s surface (the lower boundary of the mesosphere).

29
Q

Meteorology

A

The science that deals with the phenomena of the atmosphere, especially weather and weather conditions.

30
Q

Hygrometer

A

An instrument for measuring the humidity of the air or a gas.

31
Q

Anemometer

A

An instrument for measuring the speed of the wind, or of any current of gas.

OOW (18 decks)

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