Jeppesen - Meteorology

Question 1

What radius from an aerodrome does a TAF cover?

Answer 1

5nm

Question 2

What is a TTF?

Answer 2

Trend type forecast - An aerodrome weather report (METAR/SPECI) to which a statement of trend is appended.
It supersedes the TAF

Question 3

Validity period of a TTF

Answer 3

Normally 3 hours

Question 4

How many OKTAS is SKC?

Answer 4

Sky Clear

Question 5

How many OKTAS is FEW?

Answer 5

1 - 2

Question 6

How many OKTAS is SCT?

Answer 6

3 - 4

Question 7

How many OKTAS is BKN?

Answer 7

5-7

Question 8

How many OKTAS is OVC?

Answer 8

8

Question 9

Is a PROB used in a TTF?

Answer 9

No.

Question 10

What is a METAR?

Answer 10

Meteorological Aerodrome Report.

Used to identify routine observations hourly or half hourly

Question 11

What is a SPECI?

Answer 11

A report used to identify special observations i.e.: when conditions are at or below specified criteria, or when there have been significant changes to the last report

Question 12

In a TAF what visibility is given?

Answer 12

The prevailing visibility (the greatest visibility covering more than half the airport)

Question 13

In a METAR/SPECI what visibility is given?

Answer 13

The prevailing and minimum visibility (both if the visibility is fluctuating)

Question 14

Define CAVOK

Answer 14

Visibility +10km
Nil significant cloud below 5000’ or below the highest 25nm MSA - which ever is greatest & no CB/TC at any height
Nil significant weather
Note: From staffed stations only

Question 15

Rainfall in a METAR are in the form of RF##.#/###.# - What do the first three and last 4 digits represent?

Answer 15

First 3 - Rainfall in the last 10 minutes (since observation time)
Last 4 - Rainfall since 0900 local
All expressed in the nearest 0.2mm