WorksheetsHurricane Storm Theory
Total questions: 38
Worksheet time: 19mins
Low level wind shear is commonly associated with:
Passing frontal systems
Steady winds exceeding 10 knots
Light precipitation
The suffix 'nimbus,' used in naming clouds, means
a cloud with extensive vertical development.
a middle cloud containing ice pellets.
a rain cloud.
What weather phenomenon should be considered when planning a small UAS flight over mountainous terrain?
Advection fog.
Turbulence.
A temperature inversion.
What are characteristics of a moist, unstable air mass?
Poor visibility and smooth air.
Turbulence and showery precipitation.
Haze and smoke.
What feature is associated with a temperature inversion?
A stable layer of air.
Chinook winds on mountain slopes.
An unstable layer of air.
The most frequent type of ground or surface-based temperature inversion is that which is produced by
terrestrial radiation on a clear, relatively still night.
warm air being lifted rapidly aloft in the vicinity of mountainous terrain.
the movement of colder air under warm air, or the movement of warm air over cold air.
Which conditions result in the formation of frost?
The temperature of the collecting surface is at or below freezing when small droplets of moisture fall on the surface.
The temperature of the surrounding air is at or below freezing when small drops of moisture fall on the collecting surface.
The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing.
(Refer to Figure 12.) The wind direction and velocity at KJFK is from
View Figure 12
180° true at 4 knots.
180° magnetic at 4 knots.
040° true at 18 knots.
What measurement can be used to determine the stability of the atmosphere?
Actual lapse rate.
Atmospheric pressure.
Surface temperature.
What are the standard temperature and pressure values for sea level?
15 °C and 29.92 inches Hg.
59 °C and 1013.2 millibars.
59 °F and 29.92 millibars.
While operating around buildings, the Remote Pilot in Command should be aware of the creation of wind gusts that:
Enhance stability and imagery
Increase performance of the aircraft
Change rapidly in direction and speed causing turbulence
What would decrease the stability of an air mass?
Cooling from below.
Decrease in water vapor.
Warming from below.
One of the most easily recognized discontinuities across a front is
an increase in cloud coverage.
an increase in relative humidity.
a change in temperature.
A temperature inversion would most likely result in which weather condition?
An increase in temperature as altitude is increased.
Clouds with extensive vertical development above an inversion aloft.
Good visibility in the lower levels of the atmosphere and poor visibility above an inversion aloft.
What effect does high density altitude have on the efficiency of a UA propeller?
Propeller efficiency is increased.
Propeller efficiency is decreased.
Density altitude does not affect propeller efficiency.
An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is referred to as
a funnel cloud.
a lenticular cloud.
an inactive frontal cloud.
The amount of water vapor which air can hold depends on the
stability of the air.
air temperature.
dewpoint.
Every physical process of weather is accompanied by, or is the result of, a
heat exchange.
pressure differential.
movement of air.
Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?
Turbulent air, poor visibility, fog, low stratus type clouds, and showery precipitation.
Smooth air, poor visibility, fog, haze, or low clouds.
Light wind shear, poor visibility, haze, and light rain.
What are characteristics of unstable air?
Turbulence and poor surface visibility.
Nimbostratus clouds and good surface visibility.
Turbulence and good surface visibility.
The boundary between two different air masses is referred to as a
front.
frontolysis.
frontogenesis.
What are characteristics of a moist, unstable air mass?
Cumuliform clouds and showery precipitation.
Poor visibility and smooth air.
Stratiform clouds and showery precipitation.
Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as
standing lenticular clouds.
mammatocumulus clouds.
roll clouds.
What are the characteristics of stable air?
Poor visibility and steady precipitation.
Poor visibility and intermittent precipitation.
Good visibility and steady precipitation.
One weather phenomenon which will always occur when flying across a front is a change in
wind direction
stability of the air mass.
type of precipitation.
What is the minimum visibility required to conduct flight operations with a small UA?
5 SM
3 SM
1 SM
What is a characteristic of stable air?
Cumulus clouds.
Unlimited visibility.
Stratiform clouds.
The effects of a building or other obstruction on wind flow
is only prevalent on the windward side of the obstruction.
is only noticeable in gusty wind conditions.
can create gusts that change rapidly in direction and speed.
Moist, stable air flowing upslope can be expected to
cause showers and thunderstorms.
develop convective turbulence.
produce stratus type clouds.
Clouds, fog, or dew will always form when
water vapor condenses.
water vapor is present.
relative humidity reaches 100 percent.
Clouds are divided into four families according to their
composition.
outward shape.
height range.
What is meant by the term 'dewpoint'?
The temperature at which condensation and evaporation are equal.
The temperature to which air must be cooled to become saturated.
The temperature at which dew will always form.
A stable air mass is most likely to have which characteristic?
Turbulent air.
Poor surface visibility.
Showery precipitation.
If an unstable air mass is forced upward, what type clouds can be expected?
Stratus clouds with considerable associated turbulence.
Clouds with considerable vertical development and associated turbulence.
Stratus clouds with little vertical development.
You have received an outlook briefing from flight service through 1800wxbrief.com. The briefing indicates you can expect a low-level temperature inversion with high relative humidity. What weather conditions would you expect?
Light wind shear, poor visibility, haze, and light rain.
Smooth air, poor visibility, fog, haze, or low clouds.
Turbulent air, poor visibility, fog, low stratus type clouds, and showery precipitation.
What are the processes by which moisture is added to unsaturated air?
Heating and condensation.
Evaporation and sublimation.
Supersaturation and evaporation.
During an inadvertent microburst encounter, the small UA may first experience a performance-increasing headwind, followed by
performance increasing downdrafts, followed by a rapidly increasing tailwind.
performance increasing updrafts, followed by a rapidly increasing tailwind.
performance decreasing downdrafts, followed by a rapidly increasing tailwind.
You have been hired to inspect the top of a 200 foot tall water tower. The nearest airport to your planned small UA flight is reporting the weather as 1 mile visibility and overcast at 300 feet. What conditions does the weather need to improve to in order to complete the flight?
3 miles visibility and overcast at 700 feet.
3 miles visibility and overcast at 400 feet.
1 mile visibility and overcast at 700 feet.
