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#1. Drizzle occurs from
Low clouds which drizzle are stratus
#2. Altostratus (AS) is
#3. Showers occurs from
#4. Heavy icing is possible in
#5. To avoid icing in cloudy conditions, a pilot is advised to fly through a cloud which shows optical phenomena
The presence of halo signifies predominance of ice crystals in cloud and negligible chances of ice accretion
#6. Dark gray cloud giving continuous rain is called
Nimbostratus (Ns) Nimbostratus is a dense, dark-grey, rain-bearing, stratiform cloud, producing extensive and long-lasting continuous precipitation. Usually the cloud base is between the surface and 10,000ft above ground level.
#7. A uniform layer of cloud resembling fog but not on the ground
Stratus (St) Stratus (from Latin stratum, meaning strewn) is generally a grey, layered cloud with a fairly uniform base, which may produce drizzle, or light snow. Stratus cloud is no more than 1,000 – 1 500 ft thick, and is often much thinner. Stratus is usually the lowest of all cloud types
#8. The clouds composed of ice crystals having feathery appearance
Cirrus (Ci) Cirrus (from Latin cirrus, meaning curl) is the highest of all the cloud types and is composed entirely of ice crystals. Cirrus clouds take the form of white delicate filaments, in patches or narrow bands. They may also be described as fibrous or hair-like. Cirrus clouds can be found between 16,500 and 45,000 ft. They often herald the approach of a warm front.
#9. NS clouds occur
#10. Halo is associated with the cloud
Cirrostratus is made up of ice crystals, and lies between 18,000 and 45,000 ft. Cirrostratus is a further warning of an approaching frontal system, and, like altostratus, may cause the Sun and Moon to appear with a halo.
#11. Corona is associated with the cloud
Altostratus is a grey or bluish sheet, or layer of cloud, which can be fibrous or uniform in appearance. Sometimes, altostratus covers the whole sky, giving a “ground glass” effect around the Sun or Moon. Called corona
#12. Lenticular clouds indicate presence of
Altocumulus lenticularis, also known as lenticular cloud, is found downwind of mountainous or hilly areas, and is indicative of the presence of mountain wave activity.
#13. The lowest level below which condensation trails will not form is
#14. Rain falling from cloud but not reaching ground is
Microbursts are most likely to occur in summer air mass thunder-storms in low latitude regions where surface conditions are dry. They cause extreme turbulence and severe wind shear conditions.
A warning sign is virga, which is streaks of precipitation from below the cloud which do not reach the ground.
#15. CB with distinct anvil is called
A cumulonimbus capillatus is a cumulonimbus cloud with dense cirrus clouds which makes the cloud’s top appear to contain hair-like structures.
#16. Cloud ceiling is the height of the cloud covering
CLOUD CEILING
“The height above aerodrome level of the lowest layer of cloud of more than 4 oktas” .
#17. No condensation trails occur above
#18. Cloud of operational significance has base below _____ m or below the highest minimum sector altitude, which is greater
Below 1500 metre or 5000 feet cloud would cause APPROACH BAN
#19. AC cloud with cumuliform protuberances are indicative of
Cumulonimbus clouds sometimes develop from altocumulus castellanus, when instability is present at medium levels of the Troposphere.
#20. Hail may be experienced under the anvil of a CB