Meteorology Flashcards
From a standpoint of weather, ______ is the most important component of the air.
Water vapour
The most important property of the atmosphere is ______.
Expansion
The ICAO standard atmosphere for the continent of North America assumes ______.
The air is a perfectly dry gas.
Most of the “weather” occurs in the _____ because of the presence of water vapour and strong vertical currents.
Troposphere
In the ICAO standard atmosphere the rate of decrease of temperature with height is ______ per 1000 feet.
1.98 degrees Celcius
Clouds from which precipitation falls are designated _______ clouds.
Nimbus
In the new METAR weather reporting code the sky is divided in 8 segments called okras. The sky condition FEW means that _____ okras (8ths) or less of the sky is covered by clouds.
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Lines on a weather map that join areas of equal barometric pressure are called _________.
Isobars
Where the isobars are very close together, the pressure gradient is steep and the wind is _______.
Strong
A _____ is a rapid and irregular fluctuation in wind speed and direction caused by mechanical turbulence and unequal heating of the earth’s surface.
Gust
When a given mass of air is heated and no new water vapour is added, the relative humidity of the air _______.
Decreases
Air that will resist upward or downward displacement and tends to return to its original horizontal level is said to be ______.
Stable
The temperature that air must be cooled at a constant pressure to become saturated is called ______.
Dew point
The dangers associated with the passage of a thunderstorm are ______.
Strong, gusty winds and turbulence.
Heavy rain and hail.
Lightning
Warm air is _____ than cold air and therefore tends to _____.
Less dense, rise
If adjusted for the current pressure, the altimeter will read the true elevation of the aerodrome ________.
Above sea level
Altostratus clouds fall into which category of clouds.
Middle
A sea breeze occurs during the _____ and the wind blows from the _____ to the _____.
Day, water, land
In a climb from the surface to several thousand feet AGL, the wind will _____ and _____.
Veer and decrease
Relative humidity is _________.
The ratio of water vapour present in the air compared to the amount the same volume of air could hold if it were saturated.
The rate of decrease of temperature with height is called the ______.
Lapse rate
The mature stage of a thunderstorm cell is marked by the ________.
Appearance of precipitation on the ground.
Terminal Aviation Forecasts (TAFS) are issued ________ times daily and are valid for ______.
4, 24 hours
METAR CYZX 182000Z CCA 12015G20 KT 3/4SM R13/4000 FT/D +SN BLSN BKN 005 OVC 020 M02/M05/A3000 REPE WS RWY 13 RMK SF 6 SC 2 VIS 1/4 TONE SLP 990
The term CCA means ______.
This is the first correction of a report taken on the 18th day of the month at 2000 UTC
METAR CYZX 182000Z CCA 12015G20 KT 3/4SM R13/4000 FT/D +SN BLSN BKN 005 OVC 020 M02/M05/A3000 REPE WS RWY 13 RMK SF 6 SC 2 VIS 1/4 TONE SLP 990
The present weather is _______.
Heavy snow and moderate blowing snow.
METAR CYZX 182000Z CCA 12015G20 KT 3/4SM R13/4000 FT/D +SN BLSN BKN 005 OVC 020 M02/M05/A3000 REPE WS RWY 13 RMK SF 6 SC 2 VIS 1/4 TONE SLP 990
The temperature and dew point are _______.
-2 degrees Celsius, -5 degrees Celcius
METAR CYZX 182000Z CCA 12015G20 KT 3/4SM R13/4000 FT/D +SN BLSN BKN 005 OVC 020 M02/M05/A3000 REPE WS RWY 13 RMK SF 6 SC 2 VIS 1/4 TONE SLP 990
The altimeter setting is ______.
30.00 inches mercury
An aerodrome forecast (TAF) is issuers at least _____ times daily.
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