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Drone - Part 107 Weather

Terms in this set (69)

According to the weather forecast, the ceiling is 800 feet. What is the greatest altitude at which you can fly your sUAS?
A) 800 FEET agl
B) 200 Feet AGL
C) 300 FEET AGL
C) 300 FEET AGL
The VFR minimum visibility requirements over Plantation Airport are ____________________

A) 5 SM
B) 3 SM
C) 1 SM
B) 3 SM
You are checking the lighted towers around 8 nautical miles Southwest of Corpus Christi International Airport (CRP). What is the Lowest level of cloud cover that allows you to check the top of the tower?

1,604 feet MSL
1,104 FEET msl
1054 feet MSL
1,604 feet MSL

The minimum distance between the sUAS and clouds be 500 Feet below the cloud. The towers indicated 8 nautical miles southwest of CRP are 1,104 feet MSL. 1,104+500=1,604 FEET MSL
Every physical process of weather is accompanied by, or is the result of, a
heat exchange
Where could wind shear be found?
at low altitudes
at all altitudes
at high altitudes
at all altitudes
What measurement may be used to determine atmospheric stability?
Atmospheric Pressure
Surface temperature
Actual lapse rate
Actual lapse rate

The difference between a particular mass of air's existing lapse rate and the adiabatic rates of cooling in upward moving air determines whether the air is stable or unstable
What is the minimum distance from clouds that is required for sUAS OPERATIONS UNDER PART 107?
clear of clouds
500 feet below 2000 feet horizontally
500 feet above 1,000 feet horizontally
500 feet below 2000 feet horizontally
A strong consistent wind blows from the north. Your mission is to photograph a region to the south of the current ,location. You are on a wide open field with no obstacles. Which the following is not an issue during this procedure?
A) Strong wind conditions may consume more battery power at a faster rate than in calm conditions
B) Turbulent conditions will likely be a significant factor during the operation
C) Strong wind exceed the performance of the sUAS making it impossible to recover
B) Turbulent conditions will likely be a significant factor during the operation
What is the best environment for frost formation?
A) Surface temperature is below freezing, air temperatures is below freezing
B) Surface temperature is above freezing, air temperatures is below freezing
C) Dew point of surface is below freezing, dew point is above freezing
A) Surface temperature is below freezing, air temperatures is below freezing
A change in -______________ is a weather phenomenon that will always occur when flying across a front
A) type of precipitation
B) stability of air mass
C) wind direction
C) wind direction
_______________________ is one of the inflight conditions required for structural Icing to form
A) stratiform clouds
B) small temperature dew point spread
C) visible moisture
C) visible moisture

For structural icing to occur in flight, two conditions must be met:
!) the aircraft must be flying through visible water, such as rain or cloud droplets
2) the temperature where the moisture strikes the aircraft must be 0 degrees Celsius (32 degrees Fahrenheit) or lower
Which of the following factors is mots important to a remote PIC when evaluating the performance of an unmanned aircraft?
A) the type of sUAS operation
B) Current weather conditions
C) the number of available ground crew
B) Current weather conditions
For thunderstorms to form, they requires which of the following conditions?
A) high humidity, lifting force and unstable conditions
B) lifting force moist air, and extensive cloud cover
C) high humidity, High temperature, and cumulus clouds
A) high humidity, lifting force and unstable conditions
If the outside air temperature (OAT) at a certain altitude is higher than normal, the density altitude is

A) high than pressure altitude
B) lower than pressure altitude
C) equal to pressure altitude
A) high than pressure altitude

if the temperature is hight than normal, the density altitude will be higher than the pressure altitude
What conditions are most favorable for the formation of radiation fog?

A) moist, tropical air moving over cold offshore water
B) the movement of cold air over much warmer water
C) warm, moist air over low, flatland areas on clear, calm nights
C) warm, moist air over low, flatland areas on clear, calm nights

Clear skies, little or no wind, and a small temperature/dew point spread are all excellent conditions for radiation fog (high relative humidity). Because water surfaces cool little from nighttime radiation, radiation fog I restricted to land
"RAB35" is listed in the remarks section for KMDW. What does this entry mean?
A) the barometer has risen 0.35" HG
B) RAIN began at 1835Z
C) Blowing mist has reduced the visibility to 1-1/2 SM
B) RAIN began at 1835Z
WHAT is the earliest time on the 12th (TODAY) that visibility may be lowered below the 3SM minimum for sUAS operations, according to the KMEM Forecast?
A) 1720Z
B) 2200Z
C) 2000Z
C) 2000Z

There is a 40% probability (PROB) THAT Visibility will reduce to 1 SM between 2000Z and 2200Z due to a thunderstorm (TS) and moderate rain (RA)
_____________________ are the kind of thunderstorms that pose the greatest risk to aircraft.

A) warm fron thunderstorms
B) steady state thunderstorms
C) Squall line thunderstorms
C) Squall line thunderstorms

A squall line is a narrow, non frontal band of active thunderstorms. The line may be too long to detour easily, as well as too wide and severe to penetrate. It frequently contains severe stead state thunderstorms and is the single most severe weather threat for aircraft
Which of the following factors would tend to increase the density altitude at a certain airport referenced in the weather briefing?
A) an increase in barometric pressure
B) a decrease in relative humidity
C) an increase in ambient temperature
C) an increase in ambient temperature

On a hot day the air becomes "thinner" or lighter, and its density corresponds to a higher altitude in the standard atmosphere, giving rise to the term "High density altitude"
________________________ is defined as the zone between different temperature, humidity, and wind

A) an air mass
b) wind shear
C) a front
C) a front
Which of the following statements about the ASOS/AWOS weather reporting systems is correct?
A) Both ASOS AND AWOS have the capability of reporting density altitude, as long as it exceeds the airport elevation by more than 1000 feet
B) ASOS locations perform weather observing functions necessary to generate METAR reports
C) Each AWOS station is part of a nation wide weather reporting station
B) ASOS locations perform weather observing functions necessary to generate METAR reports
Which hazardous atmospheric phenomenon might be expected during sUAS recover/landing if there is thunderstorm activity near an airport where you plan to land?

A) steady rain
B) wind-shear turbulence
C) Precipitation static
B) wind-shear turbulence
________________ should be obtained by the remote pilot in command in order to receive a complete weather overview for the planned flight
a) an abbreviated briefing
B) an outlook briefing
C) a standard briefing
C) a standard briefing
Advection fog is ore likely to form under which situation?
A) an air mass moving inland from the coast in winter
B) a warm moist air mass on the windward side of mountains
C) a light breeze blowing colder air out to sea
A) an air mass moving inland from the coast in winter

When moist air flows over cooler ground or water advection fog occurs. It is particularly along coastal areas. Because of the cold water, fog frequently accumulates offshore and is pushed inland by the wind
Squalls are most likely to form at __________________

A) high altitude
B) any altitude
C) low altitude
B) any altitude

A squall line, or continuous line of thunderstorms, may form along or ahead of the front. Squall lines pose a significant risk to pilots because squall thunderstorms are intense and move quickly. Squall can occur at any altitude and are not limited to high altitude or low altitude operations
Which of the following are the properties of stable air?
A) Good visibility and steady precipitation
B) poor visibility and steady precipitation
C) Poor visibility and intermittent Precipitation
B) poor visibility and steady precipitation

A stable air mass is characterized by stratiform clouds and fog, continuous precipitation, smooth air, and fair to poor visibility in haze and smoke
Through 1800wxbrief.com, you have obtained an outlook briefing from flight service. According to the briefing, you can expect a low level temperature inversion with high relative humidity What kind of weather do you anticipate?
A) smooth air, poor visibility, fog, haze, or low clouds
B) Turbulent air, poor visibility, fog, low stratus type clouds, and showery precipitation
C) Light wind shear poor visibility, haze and light rain
A) smooth air, poor visibility, fog, haze, or low clouds

A temperature inversion occurs when the temperature of the air rises with altitude Inversion layers are typically shallow layers of smooth, stable air near the ground. The temperature of the air rises with the altitude until it reaches the tope of the inversion. The air at the layer's top acts as a lid, trapping weather and pollutants below. high relative humidity in the air can contribute to the formation of cloud, fog, haze or, smoke, resulting in reduced visibility in the inversion layer
How will a small unmanned aircraft's performance be affected by high density altitude?
A) increase performance
B) no change
C) decrease performance
C) decrease performance
What is the minimal visibility requirement for sUAS operations
a) 1 miles
b) 4 miles
c) 3miles
c) 3miles
What is indicated when there is the presence of ice pellets at the surface?
a) there are thunderstorms in the area
b) there is a temperature inversion with freezing rain at a higher altitude
c) there has been cold frontal passage
b) there is a temperature inversion with freezing rain at a higher altitude
A METAR wind reading of 17004KT indicates that the wind is blowing at __________________
a) 170 degree magnetic 40 knots
b) 170 degreee true at 4 knots
c) 170 degree at 4 knots
b) 170 degreee true at 4 knots

There's a saying that if you read it, it's true, if you hear it it's magnetic. Because a METAR is a weather product that you read, it must be true
Thunder storms are strongest in ______________ stage
a) maturing
B) dissipating
C) buildling
Maturing

Thunderstorms hazards are at their greatest during the mature stage, when precipitation starts
The visibility at KMEM is predicted to be __________ between 1000Z to 1200Z
a) 3 statute miles
b) 6 statue miles
c) 1/2 statue mile
a) 3 statute miles

The visibility at KMEM is expected to be 3 statue miles between 1000z and 1200 z (BECMG 1012...3SM
The standard pressure at 3,000 feet MSL is _______________ using standard lapse rates

a) 29.62" HG
B) 32.92" HG
C) 26.92" HG
C) 26.92" HG

The standard pressure at sea level is 29.92" hg. The standard pressure lapse rate is 1" hg per 1,000 feet. if it's 1" per 1,000 ft, then that means it's 3" (inch) per 3,000' (feet) 29.92" hg - 3" hg = 26.92" hg
Which of the following weather phenomena is always associated with a thunderstorm
A) heavy rain
B) lightning
C) hail
B) lightning

A thunderstorm is a local storm that is always caused by a cumulonimbus cloud and is always accompanied by lighting and thunder
What is the expected length of an individual microburst?
a) one microburst may continue for as long as 2-4 hours
b) two minutes with maximum winds lasting approximately 1 minute
c) Seldom longer than 15 minutes from the time the burst strikes the ground until dissipation
c) Seldom longer than 15 minutes from the time the burst strikes the ground until dissipation


A individual microburst will rarely endure more than 15 minutes from the ti me it hits the ground until it dissipates. However, there could be multiple microbursts in the area
Which of the following is the most dangerous types of thunderstorms?
A) an airmass thunderstorm
B) Squall lines
C) an isolated thunderstorms
B) Squall lines
What effect does high density altitude have on UA propeller efficiency?
a) propeller efficiency is decreased
b)propeller efficiency is increased
c) Density altitude does not affect propeller efficiency
a) propeller efficiency is decreased

The thrust produced by the propeller is proportional to the mass of air accelerated through the rotating blades. Propeller efficiency decreases as air density decreases
What kinds of fog are dependent on wind to exist
a) Radiation fog and ice fog
B) advection fog and upslope fog
C) Steam fog and ground fog
B) advection fog and upslope fog

When moist air moves over cooler ground or water, advection fog occurs. It is most frequent along coastlines, but it can also occur deep in continental areas. Advection fog thickens when wind speed rises to around 15 knots. Winds more than 15 knots lift the fog and lift it in a layer of low stratus or stratocumulus. Upslope fog arises when moist, stable air is adiabatically heated as it flows up sloping terrain. The fog disappears once the upslope wind stops
Which of the following are the standard sea-level temperatures and sea-level pressures?
a) 59 degrees C and 29.92 millibars
b) 59 degrees C and 1013.2 millibars
c) 15 degrees C and 29.92 HG
c) 15 degrees C and 29.92 HG
Which stage of a thunderstorm's life cycle is mostly characterized by downdrafts?
a) mature
b) Dissipating
C) cumulus
b) Dissipating

Downdrafts characterize the thunderstorms cell's dissipating stage, and the storm dies quickly
the remote PIC should be wary of the development of wind gusts that __________________, while operating near buildings
a) change rapidly in direction and speed causing turbulence
b) increase performance of the aircraft
c) enhance stability and imagery
a) change rapidly in direction and speed causing turbulence

Local conditions, geological features, and other anomalies can alter wind direction and speed near the Earth's surface, making the sUAS difficult to be controlled and navigated
What is the minimal cloud layer base required to fly to the top of the towers 4NM east of ONAWA?
A) 1,335 FEET MSL
B) 292 FT AGL
C) 792 FEET AGL
C) 792 FEET AGL

Part 107 stipulates that the minimum distance between the sUAS and clouds be 500 feet below the cloud. The towers indicated 4 Nautical miles east of K36 are 292 feet AGL. 292 + 500 = 792 feet AGL
WHAT is the best technique for a remote pilot to predict the formation of local fog?
a) monitor the wind conditions to insure the wind speed is not increasing
b) monitor the barometric pressure to ensure that it is no decreasing
c) monitor the temperature/dew point spread
c) monitor the temperature/dew point spread

When the temperature and dew point convergence, fog is more likely to form. A temperature difference of 3 degrees Celsius ( or 5 degrees Fahrenheit) between these two temperatures indicates the possibility of fog formation
Which of the following factors influences the development of thermals?
a) Solar heating
b) A counterclockwise circulation of air
C) temperature inversions
a) Solar heating

Thermals are convective current updrafts caused by solar heating. A temperature inversion produces stable air with little or no convective activity
Which of the following characteristics is not likely to be found in a stable air mass?
a) showery precipitation
b) turbulent air
c) poor surface visibility
c) poor surface visibility

A stable air mass is characterized by stratiform clouds and fog, continuous precipitation, smooth air, and fair to poor visibility in haze and smoke
The wind direction and velocity of KJFK IS FROM
A.) 040 DEGREES TRUE AT 18 KNOTS
B) 180 DEGREES TRUE AT 4 KNOTS
C) 180 DEGREES MAGNETIC AT 4 KNOTS
B) 180 DEGREES TRUE AT 4 KNOTS

THE wind speed is shown as a five digit group (6 digits if speed is over 99 knots)

The 1st three digits represent the direction of the wind, rounded to the closest tens of degrees relative to true north, or VRB if the direction is variable

The next two digits are the speed in knots, or the next 3 digits if over 99 mph. If the wind is gusty, it is indicated by a "G" following the speed and the highest gust observed.

To indicate the use of knots for wind speed, the term " "KT" is used.

KJFK's wind group is 18004KT, which indicates the wind is blowing from 180 degrees at 4 knots
In which sort of fog might low-level turbulence occur and icing become threatening?
a) rain induced fog
b) upslope fog
c) steam fog
c) steam fog

In the winter, steam fog forms when cold, dry air from land areas passes over relatively warm ocean waters, In a team fog, low-level turbulence can occur, and ice might become hazardous.
Which of the following is regard the most hazardous condition when flying a sUAS in the vicinity of thunderstorms
a) wind shear and turbulence
b) static electricity
c) lightning
c) lightning

A lightning strike can penetrate an aircraft's skin, damage communication and navigation equipment, or strike the remote pilot or ground crew
What accounts for differences in altimeter settings between weather reporting points?

a) unequal heating the earth's surface
b) Variation of terrain elevation
c) Coriolis Force
a) unequal heating the earth's surface
With which kinds of environment is aircraft clear ice most likely to have a high accumulation rate?
a) freezing drizzle
b) freezing rain
c) Cumulus clouds with below freezing temperatures
b) freezing rain

Freezing rain below a frontal surface is a favorable environment for the quick accumulation of clear ice
What night make an air mass less stable?
a) cooling from below
b) warming from below
c) Decrease in water vapor
b) warming from below
Which of the following are the current conditions of Chicago Midway Airport (KNDW)?
A) SKY 700 FEET OVERCAST, VISIBILITY 11, OCCASIONALLY 2 SM, WITH RAIN
B) SKY 700 FEET OVERCAST, VISIBILITY 1-1/2 SM, heavy rain
C) SKY 700 FEET OVERCAST, VISIBILITY 1-1/2 SM, RAIN
C) SKY 700 FEET OVERCAST, VISIBILITY 1-1/2 SM, RAIN

The present conditions at KMDW are 1-1/2 SM VISIBILITY (1-1/2 SM) with rain (RA), and a 700-foot ceiling overcast (OVC007)
WHAT qualities distinguish a moist, unstable air mass)
a) turbulence and showery precipitation
b) haze and smoke
c) Poor visibility and smooth air
a) turbulence and showery precipitation
When will clouds, fog, or dew always appear?
a) water vapor is present
b) relative humidity reaches 100 percent
c) water vapor condenses
c) water vapor condenses
Which weather phenomenon indicates the beginning of a thunderstorm's mature stage?
a) maximum growth rate of the clouds
b) the appearance of an anvil top
c) precipitation beginning to fall
c) precipitation beginning to fall

An updraft is the main feature of the cumulus stage. Precipitation beginning to fall from the cloud base indicates the development of a downdraft and the maturation of a cell
What is the wind forecast for KMEM between 1600Z and the end of the forecast?
a) no significant wind
b) variable in direction at 6 knots
c) variable in direction at 4 knots
b) variable in direction at 6 knots

Wind will be variable in direction at 6 knots from 1600z til the end of the forecast (VRBO6KT)
Which of the following is often connected with a thunderstorm's cumulus stage?
a) continuous updraft
b) frequent lightning
c) roll cloud
a) continuous updraft

An updraft is the main feature of the cumulus stage. Precipitation beginning to fall from the clod base indicates the development of a downdraft and the saturation of a cell
under normal conditions, where should a remote pilot expect to find the highest thermal currents?
a) 7
b) 2
c) 5
b) 2

Dry locations are hotter than moist areas. Misty areas are better thermal sources than dry fields or dry ground of any nature. This is true for woodlands and forests, which are poor thermal sources because to the enormous amounts of moisture produced by foliage
A __________________ is a non-frontal, narrow band of active thunderstorms that typically forms ahead of a cold front
a) squall line
b) dry line
c) prefrontal system
a) squall line
What does SHRA mean?
A) RAIN SHOWERS
B) A SIGNIFICATION CHANGE IN PRECIPITATION IS POSSIBLE
C) A SHIFT IN WIND DIRECTION IS EXPECTED
A) RAIN SHOWERS
WHAT WEATHER CONDITIONS ARE IDEAL FOR FYING?
A) COOL DRY AIR
B) WARM MOIST AIR
C) TURBULENCE
A) COOL DRY AIR
IN THE WINTER, AN AIR MASS MOVING INLAND FROM THE COAST IS LIKELY TO PRODUCE ________________

A) RAIN
B) FROST
C) FOG
C) FOG
The predictions you considered during your preflight weather evaluation indicate that an unstable air mass is approaching your area. Which of these would not be a problem for you upcoming operation?
a) stratiform clouds
b) turbulent conditions
c) thunderstorms
a) stratiform clouds

Cumulus clouds, turbulence, showery precipitation, and good visibility characterize unstable conditions
Which of the following weather phenomena is typical among cold fronts and may concern a remote pilot?
a) long term periods of reduced visibility
b) long periods of steady precipitation
c) thunderstorms and heavy rain
c) thunderstorms and heavy rain
How does humidity affect performance?
a) it has no effect on performance
b) it decrease performance
c) it increases performance
b) it decrease performance
Which of the following is one of the most easily recognized discontinuities across a front?
a) an increase in relative humidity
b) a change in temperature
c) an increase in cloud coverage
b) a change in temperature
STABLE AIRMASS
exhibit
1. widespread stratiform clouds or fog
2. fair to poor visibility
3. smooth air
4. steady rain or drizzle
Unstable Airmass
Cumuliform clouds
showery precipitation
rough air
good visibility
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