#1. Drizzle occurs from
Drizzle is light precipitation that occurs from stratus (ST) clouds, which are low, uniform layers.
#2. Altostratus (AS) is
Altostratus clouds are mid-level clouds forming a uniform sheet or layer, usually between 2,000 and 7,000 m.
#3. Showers occurs from
Showers are associated with cumulonimbus (CB) clouds due to their strong vertical development and instability.
#4. Heavy icing is possible in
Heavy icing occurs in cumulonimbus (CB) clouds where supercooled water droplets are abundant.
#5. To avoid icing in cloudy conditions, a pilot is advised to fly through a cloud which shows optical phenomena
Halo formation indicates ice crystal clouds, which generally have less supercooled water than corona clouds, reducing icing risk.
#6. Dark gray cloud giving continuous rain is called
Nimbostratus (NS) clouds are dark gray layers producing continuous precipitation.
#7. A uniform layer of cloud resembling fog but not on the ground
Stratus (ST) clouds are low, uniform layers resembling fog but above ground level.
#8. The clouds composed of ice crystals having feathery appearance
Cirrus (CI) clouds are high clouds made of ice crystals with a feathery appearance.
#9. NS clouds occur
Nimbostratus clouds are common along warm fronts producing continuous precipitation.
#10. Halo is associated with the cloud
Halo forms when sunlight refracts through ice crystals, typically found in cirrus (CI) clouds.
#11. Corona is associated with the cloud
Corona appears when sunlight is diffracted by small water droplets in altostratus (AS) clouds.
#12. Lenticular clouds indicate presence of
Lenticular clouds form over mountains due to standing waves in the airflow, indicating mountain waves.
#13. The lowest level below which condensation trails will not form is
The drytra level is the altitude below which the air is too dry for contrails to form behind aircraft.
#14. Rain falling from cloud but not reaching ground is
Virga is precipitation that evaporates before reaching the ground.
#15. CB with distinct anvil is called
Cumulonimbus capillatus (CB Capillatus) has a well-developed anvil top due to strong vertical development.
#16. Cloud ceiling is the height of the cloud covering
Ceiling is the height of the lowest cloud layer covering 5/8 or more of the sky.
#17. No condensation trails occur above
Above the maxtra level, air is too warm or dry for contrail formation behind aircraft.
#18. Cloud of operational significance has base below _____ m or below the highest minimum sector altitude, which is greater
Operationally significant clouds are those with base below 1500 m or below the highest minimum sector altitude.
#19. AC cloud with cumuliform protuberances are indicative of
Altocumulus with cumuliform protuberances indicates mid-level instability in the atmosphere.
#20. Hail may be experienced under the anvil of a CB
Cumulonimbus clouds with an anvil can produce strong updrafts leading to hail formation beneath the anvil.
Answer any or all questions; click “Finish Quiz” to see your score.
