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