Meteorology

Question 1

Def: Ceiling
Also for which approaches do you apply ceiling?

Answer 1

The height above the ground of the base of the lowest layer of cloud below 20 000ft covering more than half the sky.

Use only vis/RVR for Precision approaches.
Plus ceiling for Non-precision approaches

Unless the specific state requires the use of ceiling and then it would be indicated in LIDO

Question 2

Nosig

Answer 2

No significant changes forecast or no cessation of weather given in the preceding part of TAF or reported in METAR.

This is a trend Forecast - 2 Hours from the Time of Observation

Question 3

CAVOK

Answer 3

1. Vis 10km or more
2. No cloud of operational significance
   (no cloud with a base below 5000ft or below the highest
   MSA or CB or TCB at any height)
3. No weather of significance to aviation

Question 4

NSC (No Significant Cloud)

Answer 4

No Cloud of Operational Significance (Cloud base not below 5000 feet or MSA and no CB or TCU any height)

CAVOK not appropriate

Question 5

Cloud Base

Answer 5

The height of the base of the lowest observed or forecast cloud element in the vicinity of an aerodrome

Question 6

Tempo

Answer 6

Tempo fluctuations lasting less than 1 hour and in aggregate not more than half of the period.

Use FM and TL unless the TEMPO occurs wholly within the TAF

Question 7

Shower

Answer 7

Precipitation from a cumuliform cloud; characterized by the suddenness of​ beginning and ending, by the rapid change of intensity, and usually by rapid ​change in the appearance of the sky; showerly precipitation may be in the form​ of rain, ice pellets or snow

Question 8

RVR P2000: P?

Answer 8

More than

Question 9

RVR 1200U/D/N: U D N?

Answer 9

U- upward
D- downward
N- no tendancy

Question 10

TAF, Def, how long can it be?

Answer 10

Terminal Area Forecast.
6h to 30h

Question 11

BECMG def plus how is the time indicated?

Answer 11

BECMG is used in TAFs to describe forecast changes. FM, TL, AT to be used.
FM- the change would continue after the end of the TAF
TL- it would end within the TAF
AT- time start and finish in the TAF

When the time is uncertain only BECMG should be used

Question 12

CB

Answer 12

Cumulonimbus cloud

Question 13

One danger of flying above the tropopause

Answer 13

Ice Crystal Icing- when cloud tops are above the tropopause

Question 14

RE

Answer 14

Recent weather phenomena observed during the period
​since the last issued routine report or last hour, whichever​is the shorter, but not at the time of observation

Question 15

FOG and MIST

Answer 15

FOG: vis less than 1000m
MIST: vis 1000m or more but not more than 5000m

Question 16

SMOKE and HAZE, vis

Answer 16

Vis is 5000m or less