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Unit 5: Aviation Weather, Effects &
Sources Pt.2 100% Correct
___________ is the 24-hour clock convention of time-keeping in which the day runs from
midnight to midnight and is divided into 24 hours, indicated by the hours passed since
midnight, from 0 to 23. This system is the most commonly used time notation in the
world today. ✔✔Military Time
__________ clouds are rain clouds. _______means "rain." ✔✔Nimbus clouds
A ________________ (______) is a notice filed with an aviation authority to alert aircraft
pilots of potential hazards along a flight route or at a location that could affect the safety
of the flight. ✔✔NOTAMs
_________ refers to the condition of lacking transparency or translucence; opaqueness. ✔✔opacity
An ____________________ is requested by pilots whose departure time is 6 or more
hours away. The briefer gives forecast information appropriate to the proposed flight route or operation. This assists the pilot in making an initial decision about the feasibility of such a flight. ✔✔Outlook Weather
Briefing
OVC is the abbreviation for "__________" when used in METARs. ✔✔Overcast (OVC)
_________________-- forms when cold air moves over warm water... kind of like
advection fog in reverse. As precipitation falls through air, it hits a warmer surface, like a hot pavement. The evaporative cooling leads to saturation and fog forms. There is
usually not a lot of wind. Same as Steam fog. ✔✔Precipitation-
Induced Fog
_________________- in aviation is a measurement of the greatest distance visible
throughout at least half of the horizon, not necessarily continuously. To take the
prevailing visibility, controllers reference a number of visual reference points: usually
buildings, hills, or other geographic features. ✔✔Prevailing
Visibility
SCT is the abbreviation for "_________" when used in METARs. ✔✔Scattered (SCT)
____________ refers to atmospheric stability, which is a measure of the atmosphere's
tendency to encourage or deter vertical motion, and vertical motion is directly
correlated to different types of weather systems and their severity. ✔✔stable air
______________ is the synchronization of clocks within a geographical area or region to a
single time standard, rather than using solar time or a locally chosen meridian
(longitude) to establish a local mean time standard. ✔✔Standard Time
A ____________________ is the most complete weather briefing which gives
information regarding current conditions, adverse conditions, whether flight is
recommended under VFR (Visual Flight Rules), and includes NOTAMs and TFRs. ✔✔Standard
Weather Briefing
____________- are low-level clouds characterized by horizontal layering with a uniform
base, as opposed to convective or cumuliform clouds that are formed by rising thermals. ✔✔stratus clouds
A __________ is a U.S. unit of distance equal to 1760 yards or approximately 1.
kilometers. ✔✔Statute Miles
____________ forms when cold air moves over warm water... kind of like advection fog in
reverse. As precipitation falls through air, it hits a warmer surface, like a hot pavement.
The evaporative cooling leads to saturation and fog forms. Same as precipitation-induced
fog. ✔✔Steam Fog
______________, or layer clouds, are cloud formations that are not vertically developed. They
are formed in relatively stable conditions, where lifted air will be restricted, and instead
be spread out horizontally. The cloud base may be quite low, if not actually touching the
ground (fog). ✔✔stratiform clouds
Surface Friction is friction arising from the movement of an object through a medium or
(less commonly) over a surface. Specifically, the component of drag arising from forces
acting tangentially on the surface of an aircraft or vessel. ✔✔Surface Friction
considered interchangeable with Greenwich Mean Time (GMT), but GMT is no longer
precisely defined by the scientific community. ✔✔Universal Time
Coordinated
(UTC)
To be "______________", the lowest layers of an air mass must be so warm and/or humid that, if
some of the air rises, then that air parcel is warmer than its environment, and so it
continues to rise. This is called moist convection. ✔✔unstable air
____________ forms when moist air rises up terrain and condenses into clouds. ✔✔Upslope Fog
In meteorology, ______- is an observable streak or shaft of precipitation falling from a cloud that evaporates or sublimates before reaching the ground. ✔✔virga
_____________ refers to the distance one can see as determined by light and weather
conditions. ✔✔visibility
___________ (VLOS) refers to the pilot's ability to see an aircraft from the ground
well enough to control it, without the use of artificial visual aids (aside from glasses). ✔✔VLOS (Visual Line-
of-Sight)
A brief statement about the cause of the weather (for example, fronts or pressure
systems) that is pertinent to your proposed route of flight. ✔✔Weather Briefs
___________ is a forecast of specific atmospheric conditions in terms of wind and temperature at certain altitudes, typically measured in feet (ft) above mean sea level (MSL). The forecast is specifically used for aviation purposes. ✔✔winds aloft
____________ (or windshear), is a difference in wind speed and/or direction over a
relatively short distance in the atmosphere. ✔✔wind shear
___________________ is used in the military and in navigation generally as a term
for Universal Coordinated Time (UCT), sometimes called Universal Time Coordinated
(UTC) or Coordinated Universal Time (but abbreviated UTC), and formerly called
Greenwich Mean Time. In military shorthand, the letter Z follows a time expressed in
