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MET Key Facts > Clouds > Flashcards

Clouds Flashcards

1
Q

Stable Clouds

A

Stratiform (flat/horizontal)

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2
Q

Unstable Clouds

A

Cumulus ‘cauliflower shaped

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3
Q

Classification of low level cloud base

A

0ft to 6500ft
Stratocumulus and cumulonimbus and stratus clouds here + NS
Water vapour and water droplets

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4
Q

Classification for medium level cloud base

A

6,500ft to 23,000ft
Alto

Altostratus/Altocumulus
Mixed ice crystals and water vapour and water droplets

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5
Q

Classification of High level clouds

A

23,000ft to 40,000ft
Cirrostratus circocumulus cirrus
Ice crystals

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6
Q

Supercooled droplets

A

0 to -10 degrees

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7
Q

Cloud Coverage - SKC

A

0 oktas

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8
Q

Cloud Coverage - FEW

A

1-2 OKTAs

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9
Q

Cloud Coverage - SCT

A

3-4 Oktas

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10
Q

Cloud Coverage - BKN

A

5-7 Oktas

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11
Q

Cloud Coverage OVC

A

8 Oktas

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12
Q

BR on METAR means

A

Mist

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13
Q

CAVOK

A

5000ft/visibility of 10km no sig weather

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14
Q

Ceilometer

A

Measure cloud base

Cloud ceiling - lowest layer of cloud covering more than half

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15
Q

Cirrus (Ci)

A

Delicate/Filaments/Fibrous/Silky sheen
No Precipitation

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16
Q

Moderate Snow from cumulus cloud?

A

SHSN

17
Q

Castellanus

A

Turret Shaped

CI/CC/AC/SC

Instability/Flat base/Thunderstorm development

18
Q

Lenticularis

A

Lens shaped/Almond shaped cloud

Indicate mountain waves

19
Q

Fractures

A

Broken/Ragged appearance

Stratus + CU

20
Q

Uncius

A

Like a comma/mares tails

CI

21
Q

Which type of cloud has the greater ratio of super cooled water droplets to ice crystals

A

Stratus

22
Q

Altocumulus Castellanus

A

Tower or turrets
Most dangerous altocumulus cloud as can develop to bring thunderstorms and heavy rain

7,000ft to 18,000ft
Unstable air heated from below

23
Q

Mixed ice is most likely to be encountered in

A

Nimbostratus
Large droplets and small droplets

-9 degree and -14 degrees

24
Q

PO

A

Dust devil

25
Q

VA

A

Volcanic ash

26
Q

FU

A

Smoke

27
Q

Cumulus Fractus

A

Detached clouds around 2000ft-3000ft not puffy like the rest
Very unstable and indicate unstable air
Indicate change in weather coming

MET Key Facts (25 decks)

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