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Meteorology > Precipitation > Flashcards

Precipitation Flashcards

1
Q

What are some issues with precipitation for ATS?

A

Visbility Reduction
Low Clouds
Downdraughts
Freezing Rain
Snow or Ice
Snow or Ice Clearing
Contamination of the runways and taxiways
Reduced braking action
Temporarily close a runway or airport

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2
Q

What are the present weather phenomena?

A

Precipitation
Obscuration
Other

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3
Q

What are the different types of precipitation?

A

Drizzle (DZ)
Rain (RA)
Snow (SN)
Snow Grains (SG)
Ice Pellets (PL)
Ice Crystals (IC)
Hail (GR)
Small Hail (GS)

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4
Q

What is Drizzle?

A

DZ

Slowly falling water droplets less than 0.5mm in diameter. Their individual impact on water is imperceptible.

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5
Q

What is Rain?

A

RA

Water droplets with a diameter of 0.5mm or more. Continuous rain falls from clouds formed by slant-wise ascent and heavy showers of shorter duration are produced by deep convective clouds.

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6
Q

What is Snow?

A

SN

White or translucent ice-crystals in a complex branch hexagonal form. Snow will reach the surface if the temp is near or below zero.

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7
Q

What are Snow Grains?

A

SG

Frozen precipitation in the form of very small, white and opaque grains of rice. Solid equivalent of drizzle.

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8
Q

What are Ice Pellets?

A

PL

Precipitation in the form of transparent/translucent pellets of ice.

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9
Q

What are Ice Crystals?

A

IC

Precipitation in the form of very tiny, singular or unbranched ice needles, columns or plates.

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10
Q

What is Hail?

A

GR

Small balls or pieces of ice with a diameter of 5mm or more.

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11
Q

What is Small Hail?

A

GS

Hailstones with a diameter of less than 5mm.

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12
Q

What is the size of a water-droplet in a cloud?

A

0.02mm

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13
Q

What is the size of Drizzle?

A

Drops less than 0.5mm. Usually around 0.2mm

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14
Q

What is the size of Heavy Rain?

A

Max 5.5mm in Diameter.

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15
Q

What is precipitation?

A

Any moisture that is released from the atmosphere in either liquid or solid form.

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16
Q

What are the durations of precipitation?

A

Short
Intermittent
Continuous

17
Q

What type of clouds does drizzle, freezing drizzle or snow grains come from?

A

Stratus or Stratocumulus.

18
Q

What type of clouds does continuous rain or snow come from?

A

Thick altostratus and Nimbostratus.

19
Q

What type of clouds does intermittent rain or snow come from?

A

Thick altostratus and Stratocumulus.

20
Q

What type of clouds do Rain or Snow showers come from?

A

Altocumulus, Large Cumulus and Cumulonimbus.

21
Q

What type of clouds does Hard or Soft hail come from?

A

Cumulonimbus

Meteorology (15 decks)

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