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34 Cards in this Set
- Front
- Back
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Characteristics of a low pressure system |
Inward upward and counterclockwise |
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Characteristics of a high-pressure system |
Outward downward and clockwise |
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What kind of weather would you expect in a low pressure system |
Cloudiness, precipitation and bad weather |
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What kind of weather would you expect in a high-pressure system |
Good weather |
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Name the four different types of fronts |
Cold weather, occluded front, warm front, stationary front |
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Possible weather conditions with a cold front |
Thunderstorms, heavy rain possible tornados. |
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What kind of weather would you expect with a warm front |
Drizzle, low ceilings and poor visibility |
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What is a trough and a ridge |
A trough is a long gated area of relatively low atmospheric pressure and a ridge is an area of relatively high atmospheric pressure |
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Name the standard temperature and pressure values for sea level |
15°C and 29.92 HG |
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A line on a weather chart which connects areas of equal or constant barometric pressure |
Isobars |
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What is indicated by isobars that are spaced very close together |
Higher wind |
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What causes the winds aloft to flow parallel to the isobars |
Coriolis force |
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Why do surface winds generally flow across the isobars add an angle |
Surface friction |
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At what rate does atmospheric pressure decrease with an increase in altitude |
1’ HG per 1000 feet |
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The temperature to which a sample of air must be cool to attain the state of saturation is what |
The dewpoint |
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What is likely when temperature and dewpoint are close together |
Clouds, dew or fog. |
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What factor primarily determines the type and vertical extent of clouds |
Stability of the atmosphere |
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During your preflight planning Name four meteorological Things you should be aware of with respect to icing |
Location of fronts, cloud layers, freezing levels, air temperature and pressure |
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What conditions are necessary for structural icing to occur |
Visible moisture and below freezing temperatures |
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Name the three types of structural icing that may occur in flight |
Clear ice, rime ice, and mixed ice |
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What must be done if you inadvertently encounter icing conditions |
Leave the area visible moisture |
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Three factors necessary for a thunderstorm to form |
Sufficient water vapor, unstable lapse rate, And a lifting force. |
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Name the three stages of a thunderstorm |
Cumulus stage, mature stage and dissipating stage |
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An increase in temperature with height is known as a |
Temperature inversion |
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Two basic ways that fog my form |
Cooling air to the dewpoint adding moisture to the air near the ground |
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When the ground cools the adjacent air to the dewpoint on CAlm clear night this is known as what |
Radiation fog |
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The transport of warm humid air over a cold surface is known as what |
Advection fog |
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What forms as a result of moist, stable air being cooled adiabatically as it moves upward sloping to rain |
Upslope fog |
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What is known as the rate of change of wind velocity direction and or speed per unit distance |
Wind shear |
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What is HIWAS |
Hazardous in-flight weather advisory service |
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This implies severe or greater turbulence, severe icing and low level windshear |
Convective Sigmet |
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This advisers of whether that is potentially hazardous to all aircraft |
Sigmet WS |
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Advisories of significant weather phenomena that describe conditions at intensities lower than those which require the issuance of sigmets |
Airmet WA |
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What are the three different types of air mets |
Sierra describes IFR conditions and or extensive mountain obscurations Tango described as moderate turbulence sustain surface winds Zulu describes moderate icing and provides freezing levels |
