Weather

Question 1

standard day

Answer 1

standard air temperature is 15º C (59º F), and standard air pressure is 29.92” Hg, or inches of mercury (1013 millibars)

Question 2

Absolute Altitude

Answer 2

the height above ground level (AGL)

Question 3

True Altitude

Answer 3

the height above mean sea level (MSL)

Question 4

Density Altitude

Answer 4

how we measure the density of air

Question 5

Higher Density Altitude Occurs at

Answer 5

Higher elevations, Lower atmospheric pressures

Higher temperatures, Higher humidity

Question 6

Lower Density Altitude Occurs at:

Answer 6

Lower elevations, Higher atmospheric pressures

Lower temperatures, Lower humidity

Question 7

Convective Currents

Answer 7

Different surfaces radiate heat in varying amounts. Plowed ground, rocks, sand, and barren land give off a large amount of heat; water, trees, and other areas of vegetation tend to absorb and retain heat. land and rock push air up and water and vegetation push air down.

Question 8

Sea Breeze

Answer 8

during the day land heats up faster than the water so you get breezes coming in from the ocean. air going up over land then going down over water in a circular pattern.

Question 9

Land Breeze

Answer 9

At night the opposite happens. water the air goes up and the air goes down. breezes going out to the water. and moves up and then inland

Question 10

Evaporation Fog

Answer 10

is the changing of liquid water to water vapor. After a rain, as the rainwater disappears from the ground, it evaporates into the atmosphere.

Question 11

Sublimation Fog

Answer 11

is the changing of ice directly to water vapor, completely bypassing the liquid stage. If you’ve ever seen dry ice, you’ve seen sublimation at work.

Question 12

Relative Humidity

Answer 12

Relative humidity is the actual amount of moisture in the air compared to the total amount of moisture the air could hold at that temperature. flying in an environment with relative humidity readings of 75 to 90 percent would decrease the performance of your aircraft.

Question 13

Temperature and Dew Point

Answer 13

The dew point, given in degrees, is the temperature at which the air can hold no more moisture, so it’s at 100% humidity. As moist, unstable air rises, clouds often form at the altitude where temperature and dew point reach the same value.

Question 14

Fog

Answer 14

Fog typically occurs when the temperature of air near the ground is cooled to the air’s dew point. Remember, the dew point is the temperature at which the air will have 100% humidity – it’s fully saturated with water vapor. At this point, the water vapor in the air condenses and becomes visible in the form of fog.

Question 15

Radiation Fog

Answer 15

Radiation fog happens when the surrounding air reaches its dew point, and the ground cools rapidly due to terrestrial radiation. It’ll form on clear nights, with relatively little to no wind present. quickly burns off during the day.

Question 16

Advection Fog

Answer 16

Advection fog is common in coastal areas 1) where sea breezes can blow moist air over cooler land masses, and 2) when air masses move inland from the coast.

Question 17

Upslope Fog

Answer 17

moist, stable air is forced up sloping land features like a mountain range. Like advection fog, upslope fog requires wind for formation and continued existence.

Question 18

Steam Fog

Answer 18

Steam fog is common over bodies of water during the coldest times of the year, and because of that, it’s also known as sea smoke.

Question 19

Ice Fog

Answer 19

Ice fog occurs in cold weather when the temperature is way below freezing, and water vapor forms directly into ice crystals.

Question 20

SIGMET Advisories

Answer 20

it’s a weather advisory that contains information about significant weather events like thunderstorms and severe turbulence.

Question 21

AIRMET Advisories

Answer 21

reports weather of lower intensities that are potentially unsafe to pilots. Less severe weather: things like moderate turbulence and icing, sustained surface winds of 30 knots or more, or widespread restricted visibility.

Question 22

Thunderstorm Phases

Answer 22

They form when there is: High Humidity, Unstable Conditions (change of temperature as air raises) Lifting Force An initial upward boost to start the process A thunderstorm makes its way through three distinct stages before dissipating

Question 23

Unstable air

Answer 23

Cumuliform clouds, Turbulent air, Good visibility

Showery precipitation

Question 24

Stable air

Answer 24

Stratiform clouds, Smooth air, Fair-to-poor visibility in haze and smoke, Continuous precipitation