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WorksheetsPart 107 Aviation Weather II
Total questions: 35
Worksheet time: 18mins
When flying across a front, a weather phenomenon that occurs is change in...
Wind direction
Air mass stability
Precipitation
Refer to the figure to the left. What is the wind condition at Wink, Texas (KINK)?
Calm
111° at 2 knots, gusts to 18 knots
100° at 4 knots, gusts at 15 knots
Advection fog will likely form in which of these situations?
An air mass moving inland from the coast in winter
A light wind blowing cold air over the sea
A moist, warm air mass blowing onto the side of mountains
What are the characteristics of moist and unstable air mass?
Haze and smoke
Showery precipitation and turbulence
Smooth air and poor visibility
A hazard that is most intense to aircrafts is produced by which thunderstorm?
Steady-state thunderstorms
Warm front thunderstorms
Squall line thunderstorms
Underneath a low-level temperature inversion layer with a high relative humidity, the weather condition is expected to be...
Light wind shear, haze, light rain and poor visibility
Turbulent air, fog, poor visibility, low sttatus clouds and a showery precipitation
Smooth air, fog, haze, poor visibility and low clouds
When a cloud name receives a suffix "nimubs", it means the cloud is a...
Middle cloud that contains ice pellets
Stormy cloud
Rain cloud
A thunderstorm at a cumulus stage will exhibit which of these features?
Frequent lightning
Continuous updraft
Roll cloud
Between weather reporting points, variation is caused in altimeter settings by...
Coriolis force
Unequal heading of the Earth's surface
Variation in terrain elevation
A mature stage of thunderstorm begins with which phenomonon?
Precipitation begins to fall
Sudden appearance of thick clouds
Clouds growing quickly
A radiation fog is conducively formed in which of these situations?
Moving cold air over warm water
Tropical moist air moving over offshore water
Warm, moist air over low, flatland areas on clear, calm nights
Which of these conditions precipitate a thunderstorm's formation?
Lifting force, extensive cloud cover and moist air
High humidity, unstable conditions and lifting force
Cumulus clouds, high temperature and high humidity
The surface wind is southerly while the wind at 5,000 feet AGL is southwesterly. What causes the difference in the direction?
Friction between the wind and the surface
A stronger Coriolis force on the surface
Stronger pressure at higher altitude
Convective turbulence is indicated by what type of cloud?
Nimbostratus clouds
Cirrus clouds
Towering cumulus clouds
The figure illustrates that the remarks section for KMDW has RAB35 listed. What does this mean?
Rain stopped at 1835Z
Visibility is reduced by blowing mist
Rain began at 1835Z
Hazardous wind shear is expected...
in areas of low-level temperature inversion, frontal zones and clear air turbulence
following a frontal passage when stratocumulus clouds form indicating mechanical mixing
when stable air crosses a mountain barrier where it flows in layers forming lenticular clouds
When a stable, moist, warm air flows upslope, it...
develops convective turbulence
causes showery precipitation and thunderstorms
produces stratus type clouds
What type of fog causes low-level turbulence to occur resulting in dangerous icing?
Upslope fog
Rain-induced fog
Steam fog
A non-frontal, narrow band of active thunderstorms which often develop ahead of a cold front is known as:
Squall line
Prefrontal system
Dry line
What type of fog must have wind to form?
Radiation and steam fog and upslope fog
Advection fog and upslope fog
Ground fog and upslope fog
Which of these are characteristics of unstable air?
Steady precipitation and poor visibility
Steady precipitation and good visibility
Intermittent precipitation and poor visibility
What is the approximate base of the cumulus cloud if the surface air temperature at 1,000 feet MSL is 70° F and the dew point is 48° F?
4,000 feet MSL
5,000 feet MSL
6,000 feet MSL
During winter an air mass moving inland from the coast will result in:
Frost
Fog
Rain
Ceiling in aviation is defined as the height above Earth's surface of the...
lowest broken or overcast layer or vertical visibility into an obscuration
a thin, scattered and broken low layer of clouds
lowest reported obscuration and the highest layer of clouds reported as overcast
What term names the boundary that exists between two air masses that are different?
Boundary
Front
Belt
Clouds are essentially divided into different types according to their...
composition
outward shape
height range
A pilot can expect a wind-shear zone in a temperature inversion whenever the wind-speed at 2,000 to 4,000 feet above the surface is at least...
25 knots
10 knots
15 knots
A possible mountain wave turbulence should be expected when 40 knot winds blow...
Down the mountain valley, making the air unstable
Across a mountain ridge, with stable air
Parallel to the mountain peak, and the air is stable
Which of these features is associated with a temperature inversion?
Winds on mountain slopes
Stable air layer
Unstable air layer
What term defines an almond or lens-shaped cloud that appears stationary, but contains winds of at least 50 knots?
A lenticular cloud
A funnel cloud
Inactive frontal cloud
The valid period for the (KMEM) TAF is:
1800Z to 2400Z
1200Z to 2400Z
1200Z to 1800Z
As shown in the insert to the left, the visibility at (KMEM) TAF between 1000Z and 1200Z is forcasted to be:
1/2 statute miles
3 statute miles
6 statute miles
The measurement used to determine the atmospheric stability is...
Surface temperature
Actual lapse rate
Atmospheric pressure
The physical process of a weather front is a result of...
Air movement
Pressure differential
Heat exchange
In Latin, the word "stratus" means:
Cloudy
Layer
Stormy
