Weather Flashcards
If severe turbulence is encountered during your IFR flight, the airplane should be slowed to the design maneuvering speed because the
B) airplane will stall before it reaches the maximum load factor.
A characteristic of the stratosphere is
A) relatively small changes in temperature with an increase in altitude.
The average height of the troposphere in the middle latitudes is
B) 37,000 feet.
Which feature is associated with the tropopause?
A) Abrupt change in temperature lapse rate.
How much colder than standard temperature is the forecast temperature at 9,000 feet, as indicated in the following excerpt from the Winds and Temperature Aloft Forecast?
FT 6000 9000
0737-04 1043-10
A) 7°C.
The most frequent type of ground or surface based temperature inversion is that produced by
A) radiation on a clear, relatively still night.
If the air temperature is +8°C at an elevation of 1,350 feet and a standard (average) temperature lapse rate exists, what will be the approximate freezing level?
B) 5,350 feet MSL.
A temperature inversion is an indication of
A) stable air.
Which weather conditions should be expected beneath a low level temperature inversion layer when the relative humidity is high?
B) Smooth air and poor visibility due to fog, haze, or low clouds.
What causes surface winds to flow across the isobars at an angle rather than parallel to the isobars?
A) Surface friction
Which force, in the Northern Hemisphere, acts at a right angle to the wind and deflects it to the right until parallel to the isobars?
C) Coriolis.
When taxiing for takeoff, the presence of ice pellets at the surface is evidence that
C) there is freezing rain at a higher altitude.
To which meteorological condition does the term “dew point” refer?
B) The temperature to which air must be cooled to become saturated.
The presence of wet snow at your flight altitude indicates the freezing level is
C) above you.
What enhances the growth rate of precipitation?
C) Upward currents.
Which precipitation type normally indicates freezing rain at higher altitudes?
B) Ice pellets.
What type of clouds will be formed if very stable moist air is forced up slope?
A) Stratified clouds with little vertical development.
Stability can be determined from which measurement of the atmosphere?
A) Ambient lapse rate.
What determines the structure or type of clouds which form as a result of air being forced to ascend?
A) The stability of the air before lifting occurs.
The suffix “nimbus”, used in naming clouds, means a
A) rain cloud.
What are the four families of clouds?
C) High, middle, low, and those with extensive vertical development.
A cirrostratus cloud is composed mostly of
B) ice crystals.
Steady precipitation, in contrast to showers, preceding a front is an indication of
A) stratiform clouds with little or no turbulence.
The general characteristics of unstable air are
A) good visibility, showery precipitation, and cumuliform type clouds.
Which is a characteristic of stable air?
C) Stratiform clouds.
Formal waves normally form on
C) slow moving cold fronts or stationary fronts.
Which are characteristics of an unstable cold air mass moving over a warm surface?
B) Cumuliform clouds, turbulence, and good visibility.
Which weather phenomenon is always associated with the passage of frontal system?
C) A wind change.
What is indicated by the term “embedded thunderstorms”?
A) Thunderstorms are obscured by massive cloud layers and cannot be seen.
An air mass is a body of air that
C) covers an extensive area and has fairly uniform properties of temperature and moisture.
Which type of clouds are associated with the most severe turbulence?
A) Towering cumulonimbus.
If standing lenticular clouds are seen over a mountainous area, a pilot should
B) be aware of severe mountain wave turbulence.
The presence of standing lenticular altocumulus clouds is a good indication of
B) very strong turbulence.
When should a pilot consider the possibility of wind shear?
B) With either a wind shift or a wind speed gradient at any level in the atmosphere.
What is an important characteristic of wind shear?
B) It may be associated with either a wind shift or a wind speed gradient at any level in the atmosphere.
Which is a characteristic of low level wind shear as it relates to frontal activity?
A) With a warm front, the most critical period is before the front passes the airport.
The presence of cumulus clouds often indicate
B) turbulence at and below the cloud level.
Which conditions result in the formation of frost?
B) Temperature of the collecting surface is below the dewpoint of surrounding air and the dewpoint is colder than freezing.
Which family of clouds is least likely to contribute to structural icing on an aircraft?
B) High clouds.
Why is frost considered hazardous to flight operation?
A) Frost causes early airflow separation resulting in a loss of lift.
In which meteorological environment is aircraft structural icing most likely to have the highest rate of accumulation?
A) Freezing rain.
What is an operational consideration if you fly into rain which freezes on impact?
C) Temperature are above freezing at some higher altitude.
Test data indicate that ice, snow, or frost having a thickness and roughness similar to medium or coarse sandpaper on the leading edge or upper surface of an airfoil can
C) reduce lift by as much as 30 percent and increase drag by 40 percent.
Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?
A) The start of rain on the surface.
Where do squall lines most often develop?
C) Ahead of a cold front.
During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?
A) Dissipating.
Which weather phenomenon is always associated with a thunderstorm?
C) Lightning.
Which thunderstorms generally produce the most severe conditions such as heavy hail and destructive winds?
C) Squall line.
To maintain control if you unintentionally penetrate a thunderstorm while in IMC, you should
A) set power for recommended turbulence penetration airspeed and attempt to maintain a level flight attitude.
What is an indication that downdrafts have developed and the thunderstorm cell has entered the mature stage?
B) Precipitation begins to fall from the cloud base.
What are the requirements for the formation of a thunderstorm?
B) Sufficient moisture, an unstable lapse rate, and a lifting action.
If you inadvertently fly into severe turbulence, what is the safest course of action? Maintain a
A) level flight attitude.
Airborne weather avoidance radar
A) cannot assure avoidance of clouds or fog.
Under which condition does advection fog usually from?
C) Moist air moving over colder ground or water.
Fog is usually prevalent in industrial areas because of
C) an abundance of condensation nuclei from combustion products.
In which situation is advection fog most likely to form?
C) An air mass moving inland from the coast in winter.
In what localities is advection fog most likely to occur?
A) Costal areas.
What types of fog depend upon a wind in order to exist?
B) Advection fog and up slope fog.
Which conditions are favorable for the formation of radiation for?
A) Clear sky, little or no wind, small temperature/dew point spread, and over a land surface.
A jet stream is defined as wind of
50 knots or greater.
Which weather condition can be expected when moist air flows from a relatively warm surface to a colder surface?
B) Fog.
The strength and location of the jet steam is normally
B) weaker and farther north in the summer.
The station originating the following weather report has a field elevation of 1,300 feet MSL. From the bottom of the overcast cloud layer, what is its thickness? (tops of OVC are reported at 3800 feet)
SPECI KOKC 2228Z 28024G36KT 3/4SM BKN008 OVC020 28/23 A3000
A) 500 feet.
A ceiling is defined as the height of the
C) lowest layer of clouds or obscuring phenomena aloft that is reported as broken or overcast.
What is meant by the entry in the remarks section of METAR surface report for KBNA?
METAR KBNA 211250Z 33018KT 290V269 1/2SM R31/2700FT +SN
BLSNFG VV008 00/M03 A2991 RMK RAE42SNB42
B) Rain ended 42 past the hour, snow began 42 past the hour.
What condition is reported in this METAR?
METAR KBNA 281250Z 33018KT 290V360 1/2SM R31/2700FT SN
BLSN FG VV008 00/M03 A2991 RMK RAE42SNB42
C) Obscured sky with vertical visibility of 800 feet.
What is the location of the aircraft at the time of this PIREP?
UA/OV OKC 063064/TM 1522/FL080/TP C172/TA -04/WV 245040/TB LGT/RM IN CLR.
A) 64 nautical miles on the 63 degree radial from Oklahoma City VOR.
Interpret this PIREP.
MRB UA/OV MRB/TM1430/FL060/TPC182/SK BL/WX RA/TB MDT.
At 6,000 feet; between layers; moderate turbulence; moderate rain.
To what distance from the center of the runway complex does the Terminal Aerodrome Forecast (TAF) extend?
A) 5 statute miles.
What is most appropriate source to obtain information and destination weather at your arrival time?
B) Terminal Aerodrome Forecast (TAF).
If a TAF includes the notation ‘VRB’, expect winds
A) 6 knots or less.
When the visibility is greater than 6 SM on a TAF it is expressed as
C) P6SM.
“WND” in the categorical outlook in the Aviation Area Forecast means that the wind during that period is forecast to be
A) sustained surface wind speed of 20 knots or stronger.
What is the forecast wind at 1800Z in the following TAF?
KMEM 091740Z 1818 00000KT 1/2SM RAFG OVC005=
A) Calm.
SIGMET’s are issued as a warning of weather conditions potentially hazardous
B) to all aircraft regardless of size or operating environment.
Which meteorological condition is issued in the form of a SIGMET (WS)?
B) Widespread sand or dust storms lowering visibility to less than 3 miles.
What are severe weather watch bulletins (WW) issued?
B) Unscheduled and issued as required.
Area forecasts generally include a forecast period of 18 hours and cover a geographical
A) area the size of several states.
What is the wind shear forecast in the following TAF?
TAF
KCVG 231051Z 231212 12012KT 4SM -RA BR OVC008
WS005/27050KT TEMPO 1719 1/2SM -RA FG
FM1930 09012KT 1SM -DZ BR VV003
BECMG 2021 5SM HZ=
B) 500 feet AGL from 270° at 50 KT.
The Surface Analysis Chart depicts
C) actual frontal positions, pressure patterns, temperature, dew point, wind, weather, and obstructions to vision at the valid time of the chart.
A constant pressure chart provides
B) a plan view of weather at a specific pressure altitude.
If you see 9900 on a Winds and Temperature Aloft Forecast (FB), what wind speed would you expect?
A) Light and variable or less than 5 knots.
When is the temperature at one of the forecast altitudes omitted at a specific location or station in the Winds and Temperature Aloft Forecast (FD)?
A) When the level is within 2,500 feet of station elevation.
When is the wind ground at one of the forecast altitudes omitted at a specific location or station in the Winds and Temperatures Aloft Forecast (FD)? When the wind
B) at the altitude is within 1,500 feet of the station elevation.
Decode the excerpt from the Winds and Temperature Aloft Forecast (FD) for OKC at 39,000 feet.
FT 3000 6000 9000
OKC 830558
B) Wind 330° at 105 knots, temperature -58°C.
When reviewing the wings aloft forecast for flight planning purposes, you should know that the values are reported in
C) true direction and knots.