#1. Drizzle occurs from
Drizzle 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.
#3. Showers occurs from
Showers are associated with cumulonimbus (CB) clouds due to strong vertical development.
#4. Heavy icing is possible in
Heavy icing occurs in cumulonimbus (CB) clouds with abundant supercooled water.
#5. To avoid icing in cloudy conditions, a pilot is advised to fly through a cloud which shows optical phenomena
Halo indicates ice crystal clouds, reducing the risk of icing compared to corona clouds.
#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 resemble fog but are above ground level.
#8. The clouds composed of ice crystals having feathery appearance
Cirrus (CI) clouds are high clouds with feathery ice crystal formations.
#9. NS clouds occur
Nimbostratus clouds commonly occur along warm fronts.
#10. Halo is associated with the cloud
Halo forms due to ice crystals in cirrus (CI) clouds.
#11. Corona is associated with the cloud
Corona occurs with small water droplets in altostratus (AS) clouds.
#12. Lenticular clouds indicate presence of
Lenticular clouds form due to mountain waves in airflow.
#13. The lowest level below which condensation trails will not form is
Drytra level is the altitude below which contrails cannot form.
#14. Rain falling from cloud but not reaching ground is
Virga evaporates before reaching the ground.
#15. CB with distinct anvil is called
Cumulonimbus capillatus has a well-developed anvil top.
#16. Cloud ceiling is the height of the cloud covering
Ceiling is the height of lowest cloud layer covering 5/8 or more of the sky.
#17. No condensation trails occur above
Above maxtra level, air is too warm or dry for contrail formation.
#18. Cloud of operational significance has base below _____ m or below the highest minimum sector altitude
Operational clouds have base below 1500 m or the highest minimum sector altitude.
#19. AC cloud with cumuliform protuberances are indicative of
Altocumulus with cumuliform protuberances indicates mid-level instability.
#20. Hail may be experienced under the anvil of a CB
Cumulonimbus clouds with an anvil can produce hail beneath the anvil.
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