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FAA part 107 - Weather
Terms in this set (64)
the height above ground level (AGL)
The height above sea level (MSL)
how we measure the density of air
the height your altimeter shows you (when you're at sea level under standard conditions, indicated altitude is the same as true altitude)
the indicated altitude when the barometric pressure scale is set to 29.92 inHg(inches of mercury)
When density altitude is ________ you will experience _____________ aircraft performance
Higher density altitude occurs at
lower atmospheric pressures
HERE LIES HARRY HOUDINI
Lower density altitude occurs at
higher atmospheric pressures
LIVED HIS LONG LIFE
higher density altitude means ____________ air
air currents that are caused by the uneven heating of the earth; cause turbulence
Anywhere there is uneven heating of the Earths surface, you'll find _____________________
when the wind flow smoothly up one side of a mountain, and turbulent on the other side
a sudden, drastic change in wind speed and/or direction over a relatively small area.
Low level _________ can be particularly hazardous for remote pilots
a type of wind shear associated with convective precipitation, which is shorter and more intense
The stability of the atmosphere correlates with its ability to resist _______________
A stabile atmosphere makes vertical movement _____________
an unstable atmosphere makes vertical movement ______________
indicate steep or shallow wind gradients
as the air increases in altitude, the rate at which the temperature decreases is referred to as its ____________________
The average lapse rate is ________ per _________ ft in insaturated air
Cool, dry air is very _____________
Warm, moist air is very ______________
When the temperature of the air rises with altitude
All weather is created by
unequal heating of the earth's surface
Loss of positive control caused by strong updrafts
The area over which an air mass acquires its identifying distribution of temperature and moisture.
Air mass modification
Air mass moves from it's source region of new underlying surfaces.
an elongated area of high pressure
and elongated area of low pressure. All fronts lie in troughs.
The leading edge of an advancing cold air mass. Often accompanied by poor weather. Can produce thunderstorms, hail and tornadoes.
Leading edge of advancing warm air mass. Move half as quickly as cold fronts. Preceded by lowered ceilings, increased precipitation and reduced visibility.
Area of low pressure. Forms on slower moving cold fronts or stationary fronts.
The resistance of the atmosphere to vertical motion.
Resists any upward or downward movement. Temperature inversion.
Stratiform clouds, continuous precipitation, smooth air, poor visibility in smoke.
Allows upward or downward disturbance to grow in to a vertical currant.
Cumuliform clouds, showery precipitation, rough air, good visibility.
Actual lapse rate
used to determine the stability of the atmosphere
500 feet below, 2000 feet horizontally, 3sm visibility. If info in unavailable or unable to determine, PIC may not operate.
Determining local visibility
-Verify known point 3sm away is visible
-Clouds above the height of a known object
-Sufficient water vapor
-unstable lapse rate
-initial lifting force (heating from below, frontal lifting, mechanical lifting)
continuous updrafts. create low pressure areas
greatest intensity. characterized by updrafts and downdrafts. Begins at the start of rain.
Precipitation that evaporates before it reaches the ground. Associated with very turbulent conditions.
Determining lightning distance
number of seconds between lighting and thunder. Divide the result by 5-distance in SM.
Squall line thunderstorms
Most intense hazards. Non frontal, narrow bands, develop ahead of a cold front.
obscured by massive cloud layers, cannot be seen.
Small scale intense downdrafts. Usually don't last more than 15 minutes. Can occur away from the center of the storm.
Incoming air drawn into a cloud base that has and initial rotating motion. If the funnel does not touch the ground, its a funnel cloud. If it does touch the ground, its a tornado.
Requires visible moisture (clouds or raindrops). Supercooled water makes contact with any part of the aircraft that has a temperature below freezing.
indicate that there is freezing rain at higher altitude.
Icing- wet snow
Indicates that temperature at your altitude is above freezing.
surface-based clouds. Formed by cooling the air to it's dew point, or adding moisture to the air near the ground. Requires a small temperature/dew point spread.
Ground fog. Terrestrial radiation cools the ground-cools the air in contact with it. Forms in warm, moist air over low, flatland areas on clear, calm nights.
Sea fog. warm, moist air moves over colder ground or water.
Moist stable air is cooled to dew point as it moves up sloping terrain.
Precipitation induced fog
Associated with frontal activity formed by warm drizzle or rain falling through cool air. Icing, turbulence and thunderstorms.
Forms in the winter. cold dry air passes from land areas over corporately warm ocean waters. Can have low level turbulence and icing.
Neutral atmospheric conditions. High temp, high humidity and high altitude reduces performance.
Standard weather briefing
Complete weather briefing.
Abbreviated weather briefing
Only one or two items needed.
Outlook weather briefing
Departure time more than 6 hours away.
Automated surface observing system. Primary surface weather observing system. Prefix of AUTO
The lowest broken or overcast layer, or vertical visibility into an obscuration.
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