Clouds Flashcards
Cs
Gives halo around the sun
Vale of ice crystals
Ac
Rounded, bigger than Cc, mixed water and ice, Virgo
Temperature range in cloud where SCWD can be found
0* to 20*
High level tropics
20,000 to 60,000
OVC
8 oktas
FEW
1 to 2 Oktas
Cloud ceiling
Covering more than half the sky
Cbcal
Sharp defined edges , still developing, high level 45,000 feet water droplets
Cum con
Greater vertical extent, 25,000 can easily form into cb
Constanillanous
Rising plums in the middle layer, shows instability
Cuhum
Low level, below 10,000, fair weather cu
Sc
Water droplets, mixture of cumulus and stratos, icing is increased, could get light or moderate snow
St
Low level, layered, pure water droplets, drizzle, min ice risk
Middle level tropics
6,500 to 25,000
Cc
Lumpy high level cloud
SCT
3-4 oktas
Middle level cloud polar
6,500 to 13,000
Cu
Round, fluffy, evidence of thermal activity, shows unstable air, normally classed as low level, could pose severe to moderate icing risk, can grow up to 14km
Cummed
Low level, medium vertical extent
Ns
Low to mid level, guaranteed precipitation, dense, high ice risk due to amount of water in it
FRQ
Frequent
Temperature range where its majority SCWD in cloud
0* to -10*
BKN
5-7 oktas
Cb cap
Whispery top, ice crystals, large top, anvil
Cb
Cumulus grows into this, goes through all the layers, severe icing risk,
Ceilometer
Used to measure cloud base
EMBD
Embedded CB
WDSPD
Widespread cb
ISOL
Isolated cb
Lenticularis
Cc,Ac,Sc lens shape, product of the terrain, doesn’t move
Lowest level of cloud
Cloud base
Cum fractus
With st or cu, broken up cloud, rigid
High level polar regions
10,000 to 25,000
OCNL
Occasional
High level temperate
16,500 to 45,000
As
Grey, whitish layered cloud
Middle level temperate
6,500 to 23,000
Low level cloud
6,500 or below
