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ATPL - BGS [Mod 1] Meteorology > 25. METAR, TAF, SPECI and SNOWTAM > Flashcards

25. METAR, TAF, SPECI and SNOWTAM Flashcards

1
Q

METAR, TAF, SPECI and SNOWTAM

METARS are compiled at what 2 intervals;

[ ] Hourly
[ ] Quarter Hourly
[ ] Half Hourly
[ ] 2 Hourly

A

[X] Hourly
[ ] Quarter Hourly
[X] Half Hourly
[ ] 2 Hourly

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2
Q

METAR, TAF, SPECI and SNOWTAM

METARS are compiled typically hourly or every half hour at fixed times. If the hour were 1 o’clock (13:00) at what time intervals would the METARS typically be published;

13: ____ and 13: ____

A

13: 20
13:50

  • H+20 and H+50

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3
Q

METAR, TAF, SPECI and SNOWTAM

On a METAR, when prevailing visibility is given, for example, as 4000 0900NE, the prevailing visibility is the visibility that is REACHED OR EXCEEDED or LESS THAN at least half the horizon circle.

A

REACHED OR EXCEEDED

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4
Q

METAR, TAF, SPECI and SNOWTAM

When the lowest visibility is different from the prevailing visibility, and;

  1. Less than ____m OR;
  2. Less than ____% of the prevailing visibility and less than ____m

The lowest visibility observed should always be reported in relation to the aoerdrome indicated by reference to one of the eight points of the compass

4000 0900NE

A
  1. 1500 m
  2. 50% / 5000 m

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5
Q

METAR, TAF, SPECI and SNOWTAM

On an American METAR or TAF, what does P6SM stand for

A

Prevailing visibility is 6 statute miles or more
This is equivilant to 9999 in meters

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6
Q

METAR, TAF, SPECI and SNOWTAM

RVR is not normally recorded or reported when it is more than ____m

A

1500 m

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7
Q

METAR, TAF, SPECI and SNOWTAM

BR, HZ, FU, IC, DU and SA will not be recorded if the visibility is more than ____m

A

5000 m

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8
Q

METAR, TAF, SPECI and SNOWTAM

Decode the following weather example;

MIFG VCBLSN +SHRA RASN - DZHZ

A

Shallow fog
Blowing snow in the vicinity of the station
heavy showers and rain together
Rain and snow together
Light drizzle and haze together

WEATHER CODES

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9
Q

METAR, TAF, SPECI and SNOWTAM

Marry up the cloud cover to the correct number of oktas

  1. Few [ ]
  2. Scattered [ ]
  3. Broken [ ]
  4. Overcast [ ]
A
  1. Few [1-2]
  2. Scattered [3-4]
  3. Broken [5-7]
  4. Overcast [8]

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10
Q

METAR, TAF, SPECI and SNOWTAM

The cloud bases in a METAR are given as AMSL or AGL

FEW005 SCT010CB BKN025

A

ABOVE GROUND LEVEL
(AGL)

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11
Q

METAR, TAF, SPECI and SNOWTAM

Cloud type is only added for what sort of cloud classification

FEW005 SCT010CB BKN025

A

SIGNIFICANT
CB and TCU

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12
Q

METAR, TAF, SPECI and SNOWTAM

What is the formula to estimate cloud base

A

CLOUD BASE = TEMP - DEW POINT x 400

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13
Q

METAR, TAF, SPECI and SNOWTAM

What is the formula to calculate Relative Humidity from a given temperature and dew point

A

RH = 100 - ( 5 x ( TEMP - DEW POINT ) )

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14
Q

METAR, TAF, SPECI and SNOWTAM

To use CAVOK, the visibility must be ____km or more

A

10 km

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15
Q

METAR, TAF, SPECI and SNOWTAM

To use CAVOK, there must be no cloud of operational significance, which is defined as;

  1. No cloud below ____ft OR
  2. No cloud below the highest ____

Whichever of the above 2 is the greater

There will also be no weather phenomena at or near the station.

A
  1. 5000 ft
  2. MINIMUM SECTOR ALTITUDE (MSA)

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16
Q

METAR, TAF, SPECI and SNOWTAM

On an American METAR, QNH will be given as inches of mercury. If this was 29.92, what would you expect to see on the METAR

A

A2992

  • A group starts with “A” then four figures
  • These are inches and hundredths of mercury

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17
Q

METAR, TAF, SPECI and SNOWTAM

Wind shear is reported as below ____ft

A

1600

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18
Q

METAR, TAF, SPECI and SNOWTAM

If a METAR is ended with NOSIG, this means what

A

NO SIGNIFICANT CHANGE FORECAST NEXT 2 HOURS

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19
Q

METAR, TAF, SPECI and SNOWTAM

If a METAR has BECMG what does this mean

A

BECOMING

  • Indicates a permanent change to the weather
  • Will be BECMG followed by weather report in normal metar format

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20
Q

METAR, TAF, SPECI and SNOWTAM

If a METAR has TEMPO, what does this mean

A

TEMPORARY CHANGE

  • Indicates a temporary change to weather
  • This can last up to one hour in each instance and less than half the total time period given

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21
Q

METAR, TAF, SPECI and SNOWTAM

Decode the following information;

TEMPO FM0730 TL0810 3000 SHRA

A

Weather will change temporarily from 0730Z to 0810Z
Expect visibility of 3000m in moderate rain showers

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22
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METAR, TAF, SPECI and SNOWTAM

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23
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METAR, TAF, SPECI and SNOWTAM

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24
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METAR, TAF, SPECI and SNOWTAM

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25
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METAR, TAF, SPECI and SNOWTAM

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26
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METAR, TAF, SPECI and SNOWTAM

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ATPL - BGS [Mod 1] Meteorology (27 decks)

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