7: (110) Aviation Weather Flashcards
Which combination of weather-producing variables would likely result in cumuliform-type clouds, good visibility, and showery rain?
Unstable moist air and Orographic lifting.
Which is a characteristic typical of a stable air mass?
Continuous precipitation
Temperature and radiation variations over land with a clear sky typically lead to…
minimum temperature occurring after sunrise.
The wind system associated with a low-pressure area in the Northern Hemisphere is…
a cyclone and is caused by Coriolis force.
The minimum vertical wind shear value critical for probable moderate or greater turbulence is…
5 knots per 1,000 feet.
Fog produced by frontal activity is a result of saturation due to…
evaporation of precipitation.
What causes wind?
Pressure differences.
Convective currents are most active on warm summer afternoons when winds are…
light
Which in-flight hazard is most commonly associated with warm fronts?
Precipitation-induced fog.
Which is true regarding actual air temperature and dew point temperature spread? The temperature spread…
decreases as relative humidity increases
Which is true with respect to a high- or low-pressure system?
A high-pressure area or ridge is an area of descending air.
Which would decrease the stability of an air mass?
Warming from below.
There is a high pressure system that is located south of your planned route in the Northern Hemisphere on a west to east cross-country flight. To take advantage of favorable winds, you would plan your route…
on the north side of the high pressure area.
Which statement is true regarding squall lines?
They are nonfrontal and often contain severe, steady-state thunderstorms
The conditions most favorable to wave formation over mountainous areas are a layer of…
stable air at mountaintop altitude and a wind of at least 20 knots blowing across the ridge.
