DLN Questions Flashcards
(Unit 10) What clouds are classified as high clouds?
Cirrus (CI)
Cirrocumulus (CC)
Cirrostratus (CS)
(Unit 10) What clouds are classified as middle clouds?
Altostratus (AS)
Altocumulus (AC)
Altocumulus Castellanus (ACC)
(Unit 10) What clouds are classified as low clouds?
Stratus (ST) Stratocumulus (SC) Nimbostratus (NS) Stratus Fractus (SF) Cumulus Fractus (CF)
(Unit 10) What clouds are classified as clouds of vertical development?
Cumulus (CU)
Cumulonimbus (CB)
Towering Cumulus (TCU)
(Unit 10) What factors affect precipitation intensity?
Strength of the updraft within clouds
Cloud’s vertical thickness
Liquid water content of cloud
(Unit 11) What flight problems occur in a warm front?
Extensive cloud, slow moving
Icing in cloud or precipitation is minimal when present
Low ceilings and visibility
Low level wind shear is possible
(Unit 11) What flight problems occur in a cold front?
Strong convective clouds
Mechanical turbulence with gusty surface winds
Frontal wind shear
(Unit 11) What factors determine the type and amount of weather at fronts?
Cold Front - Steeper slope giving a fast lift, but narrow lifting area
Warm Front - Shallow slope with a weak lift and very wide lift area
Trowals - Combination of warm and cold fronts
Quasi-stationary Front - Weakest lift
(Unit 11) What is the stability of the warm air masses with layered clouds?
Stable air
(Unit 11) What is the stability of the warm air masses with convective clouds?
Unstable air
(Unit 11) What is the stability of the warm air masses with layered with embedded convective clouds?
Conditionally unstable air
(Unit 12) What are the performance implications of icing accumulation?
Decrease in lift
Decrease in thrust
Increase in weight
Increase in drag
(Unit 12) What are three meteorological factors affecting the formation of ice?
Liquid water content of air (LWC)
Temperature
Droplet size
(Unit 12) What temperature is associated with “most icing”
0°C to -15°C
(Unit 12) What temperature is associated with “most severe icing”
0°C to -10°C
(Unit 12) What temperature is associated with “reduced icing”
-15°C to -40°C
(Unit 12) What temperature is associated with “no icing”
-40°C
(Unit 12) What temperature is associated with “severe icing in convective clouds”
-25°C
(Unit 12) What is the easiest type of icing to remove?
Rime
(Unit 12) What type of icing can spread over the whole wing?
Clear
(Unit 12) What action must be taken in the case of moderate icing?
Keep anti/de-icing equipment running continuously
Divert
(Unit 12) What type and intensity of icing is associated with FZDZ?
Light to moderate clear icing
(Unit 12) Which cloud type is associated with “Rime Icing” and “Light, occasionally moderate intensity”
NS, ST, AS, AC, SC
(Unit 12) Which cloud type is associated with “Mixed Icing” and “Light to moderate intensity”
NS, AS
(Unit 12) Which cloud type is associated with “Clear Icing” and “Severe intensity”
CB
(Unit 12) Which cloud type is associated with “Clear Icing” and “Moderate to Severe intensity”
ACC, TCU
(Unit 13) What are the three stages of development of a thunderstorm?
- Cumulus Stage
- Mature Stage
- Dissipating Stage
(Unit 13) Which stage is the most severe stage?
Mature stage
(Unit 13) Which stage consists of only updrafts?
Cumulus stage
(Unit 13) What kind of thunderstorm is the weakest?
Warm frontal
(Unit 13) What type of thunderstorm is the most intense?
Squall
(Unit 13) What time of day are most thunderstorms most active?
Late afternoon
(Unit 13) T or F. Turbulence can only be found inside a thunderstorm.
False
(Unit 13) Where is the greatest turbulence inside a thunderstorm?
Between up and downdrafts
(Unit 13) What is the intensity of turbulence expected with most thunderstorms?
Severe
(Unit 13) What are the hazards associated with heavy rain during approach and landing?
Hydroplaning
Reduced visibility
Loss of lift
(Unit 13) What weather conditions are tornadoes associated with?
Updrafts
Rain free area
(Unit 13) How many miles must thunderstorms be avoided by when using the radar (Radar Avoidance Rule)
5 miles below freezing level
10 miles between freezing level and 30,000’
20 miles above 30,000’
(Unit 14) The height of a constant pressure surface over a cold air mass will tend to be lower or higher than if over a warm air mass. What is the correct pressure?
Lower
(Unit 14) Strong horizontal temperature gradients tend to occur near what weather condition?
Fronts
(Unit 14) What is the minimum speed requirement for a jet?
60 kts
(Unit 14) Where is the axis of the jet stream located?
On the warm side of the surface front
(Unit 14) Where is the cirrus cloud located when it is associated with a west to east jet?
On the warm air side of the jet
(Unit 14) Where is the tropopause located on the jet
Above the jet
(Unit 14) Where are the strongest horizontal wind shears when your back is to the wind in a jet core?
To the left
(Unit 14) During which season are jet streams the strongest?
Winter
(Unit 14) What time of year are jet streams the highest
Summer
(Unit 14) What time of year are jet streams the furthest north?
Summer
(Unit 14) What are two non-frontal jets?
Arctic stratospheric
Subtropical
(Unit 15) If you are entering an area of forecast CAT, what are your chances of encountering it?
> 50%
(Unit 15) Since CAT usually occurs in relatively small areas it…
Can begin and end abruptly
(Unit 15) What causes CATs
Rapid changes in wind velocity (wind shear)
(Unit 15) What condition is required to make CAT
Vertical wind shear > 5 kts / 1000 ft