Vayudoot Aviation

1. How are well separated CB clouds described on the Significant Weather Chart?

EMBD CB.

OCNL CB.

FREQ CB.

ISOL CB.

2. On WAFC significant weather charts what do the letters CB imply?

Moderate to severe icing and turbulence and hail

Moderate icing and turbulence

Moderate to severe icing and turbulence

Severe icing and turbulence and hail

3. At what times are WAFC significant weather charts produced?

At 0000, 0600, 1200, 1800 UTC

At midnight and midday only

At 0000 and 1200Z

At 0000, 0600, 1200, 1800 LMT

4. What is the validity time for a WAFC significant weather chart?

For a fixed single time only

3 hours

30 minutes

6 hours

5. Why are indications about the height of the tropopause not essential for flight documentation in the tropics?

The temperatures of the tropical tropopause are always very cold and therefore not important

The meteorological services are unable to provide such a chart

The tropopause is generally well above the flight level actually flown.

Tropopause information is of no value

6. On WAFC significant weather charts, jet streams are given flight levels. To what does this flight level refer?

The flight level of the mean wind in the jet stream

The average height of the jet stream

The flight level of the maximum wind in the jet stream

The highest flight level where the winds are more than 60 knots

7. Which weather chart gives information about icing and the height of the freezing level?

500 hPa chart

Surface chart

Low Level Significant weather chart

700 hPa chart

8. What does the symbol with an “H 450” inside it indicate on a significant weather chart?

The upper limit of significant weather at FL 450.

The lower limit of the tropopause

The center of a tropopause “high”, where the tropopause is at FL 450

The center of a high pressure area at 450 hPa

9. A pilot is warned of severe icing at certain flight levels by information supplied in

TAF and METAR

SWC and SIGMET

TAF and SIGMET

METAR and SIGMET

10. What information is given on a Significant Weather Chart?

The significant weather that is observed at the time given on the chart

The significant weather in a period 3 hours before and 3 hours after the time given on the chart

The significant weather forecast for the time given on the chart

The significant weather forecast for a period 6 hours after the time given on the chart

11. When are WAFC significant weather charts produced?

Every 6 hours

Every 3 hours

At midnight and midday only

Every 12 hours

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