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15 Cards in this Set

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The layer of the atmosphere which contains almost all clouds and precipitation.

Troposphere. Extends from the surface to around 36,000 ft.

The layer of the atmosphere where temperature increases which altitude and that is generally devoid of significant weather.

Stratosphere. Extends from the top of the troposphere up to 31 miles above the earths surface.

What is the standard atmospheric temperature, altimeter setting and lapse rate.

15 degrees C/59 degrees F, 29.92 inches of mercury, lapse rate is 2C/3.5F per thousand feet.

Which direction does the jet stream flow?

West to east.

What are the two jet streams and where are they generally located?

Polar jet stream located between 30 degrees and 60 degrees latitude.



The subtropical jet stream located between 20 degrees and 40 degrees latitude.

What gas in the atmosphere varies from trace amounts to 4% by volume.

Water vapor

What is saturation?

The maximum possible quantity of water that a parcel of air can hold at any given temperature and pressure

What is dew point?

The temperature to which a given parcel must be cooled at a constant pressure and constant water vapor content in order for saturation to occur.

What is relative humidity?

The ratio, usually expressed as a percentage, of water vapor actually in the air compared to the amount of water vapor the air could hold at a particular temperature and pressure.

What is the raw materials for clouds and precipitation?

Water vapor.

What happens to rising parcel of air?

It expands and cools as pressure decreases with altitude.

What happens to a sinking parcel of air?

Warms as it encounters increasing pressure and is compressed.

What are cirriform clouds?

High level clouds which form above 20,000, usually composed of ice crystals, usually thin and white in appearance and contains no significant icing.

What are Cumuliform clouds?

Resembles white fluffy cotton balls or heaps, indicates upward vertical motion or thermal uplift of air. Tops can reach over 60,000 feet and may produce turbulence and other hazards.

What are stratiform clouds?

Consists of a featureless low layer that can cover sky. Often produces widespread IFR weather. Little or no turbulence but can produce icing.