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OxfordSaudia > Weather > Flashcards

Weather Flashcards

1
Q

How often is a Routine METAR transmitted?

A

At intervals of 1 hour or, if so determined by regional air navigation agreement, at intervals of one half-hour.

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2
Q

How often is a SPECI METAR transmitted?

A

Shall be issued as necessary.

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3
Q

METAR winds are reported using what direction?

A

Measured in degrees in relation to True North

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4
Q

Visibility on a METAR is reported in what unit?

A

Statute

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5
Q

If TCU or CB are reported on the METAR, what other information is given?

A

Amount: ISOL (Isolated), OCNL (Occasional), FRQ (Frequent), EMBD (Embedded). Heights.

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6
Q

If a TAF is valid for less than 12 hours how often is it issued?

A

Every 3 hours.

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7
Q

If a TAF is valid 12 to 30 hours how often is it issued?

A

Every 6 hours.

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8
Q

What does FM on a TAF indicate?

A

weather expected to change more or less completely to a different set of conditions. Quicker change over an hour.

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9
Q

What does BECMG on a TAF indicate?

A

Used where changes are expected to reach or pass through specified values at a regular or irregular rate. Over the course of two hours. A very slow change.

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10
Q

What does TEMPO on a TAF indicate?

A

Temporary fluctuations of less than one hour and in aggregate less than half the period indicated by the observation forecast period.

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11
Q

How long is a SIGMET valid for?

A

4 hours. 6 hours for volcanic ash clouds and tropical cyclones.

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12
Q

Define wind shear

A

A sudden, drastic change in wind speed and/or direction over a very small area. Can occur at any altitude. Associated with passing frontal systems, thunderstorms, temperature inversions, and strong upper level winds (greater than 25 knots).

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13
Q

What is the typical lifespan of a microburst?

A

5-15 minutes

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14
Q

How strong can the downdrafts be in a microburst?

A

up to 6,000 fpm

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15
Q

What are the criteria for the issuance of CAVOK?

A

Ceiling And Visibility OK.

  1. ) Visibility is 10km or more
  2. ) No cumulonimbus, towering cumulus and no other cloud below 1500m (5000ft) or below the highest minimum sector altitude, whichever is greater.
  3. ) No significant present weather
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16
Q

What is the meaning of “no clouds of operational significance?”

A

below 1500m (5000ft) or below highest minimum sector altitude, whichever is greater, and CB, TCU.)

17
Q

What does NSC mean on a METAR?

A

Nil Significant Cloud

18
Q

How is wind greater than 100 knots indicated on a METAR?

A

P199KMH, P99KT, or P49MPS

19
Q

What unit is used to issue cloud coverage on a METAR/TAF?

A

Feet AGL

20
Q

How many 8th’s of the sky are covered when the cloud coverage is indicated as CLR?

A

0-1 oktas

21
Q

How many 8th’s of the sky are covered when the cloud coverage is indicated as FEW?

A

1-2 oktas

22
Q

How many 8th’s of the sky are covered when the cloud coverage is indicated as SCT?

A

3-4 oktas

23
Q

How many 8th’s of the sky are covered when the cloud coverage is indicated as BKN?

A

5-7 oktas

24
Q

How many 8th’s of the sky are covered when the cloud coverage is indicated as OVC?

A

8 oktas

25
Q

What is the meaning of ////// when in the cloud coverage block?

A

Cloud type cannot be observed by the automatic system.

26
Q

SIGMET Forecasts include:

A

Tropical cyclones with a maximum of the 10 minute surface wind speed is expected to reach 34kts.

Severe Squall lines

Moderate or severe turbulence

Moderate or sever icing

Widespread sandstorm/duststorm

cumulonimbus clouds associated with thunderstorms

Volcanic eruptions

Accidental release of radioactive material.

27
Q

NOSIG

A

No significant changes are forecast within the next 2 hours

28
Q

How long are High/low Level Prognostic/Significant Weather Charts issued and valid for?

A

Issued 4 times daily (0000, 0600, 1200, 1800), and valid for 24 hours.

29
Q

High Level Prog Chart Altitude levels

A

FL250-FL630

OxfordSaudia (4 decks)

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