18,000 ft

14,000 ft

24,000 ft

7,000 ft

dry and stable with light winds.

cloudy with easterly winds.

changeable with westerly winds.

stormy with occasional calm periods.

The altimeter is faulty

One of the QNH values must be wrong

The air over Marseille is warmer than that over Palma de Mallorca

The air over Palma de Mallorca is warmer than that over Marseille

Wind speed over B is higher than over A.

Wind speed over A and over B is the same.

The true altitude will be higher over A than over B.

The true altitude will be higher over B than over A.

1 is not correct, 2 is correct

1 and 2 are not correct

1 and 2 are correct

1 is correct, 2 is not correct

The METAR surface wind is measured by an anemometer at a height of 10 m and averaged over 10 minutes, but for the ATIS aerodrome controller the wind is measured at a height of 33 m and averaged over 5 minutes.

All aerodromes average their reported surface wind over 2 minutes, but it is measured by an anemometer at 10m above around level for METARs and 6 m above around level for the ATIS and aerodrome controller.

All aerodromes report the surface wind obtained from an anemometer at a height of 4 ft above ground level, but METAR surface wind are averaged over 10 minutes and ATIS and aerodrome controller surface winds are averaged over 1 minute.

At larger aerodromes, the reported surface wind is measured by an anemometer at a height of 10 m and averaged over 2 minutes for the ATIS and the aerodrome controller but averaged over 10 minutes for the METAR.

Severe turbulence in area E, microbursts in area F, and severe icing in area A.

Severe icing in area A, lightning in area C, and severe wind shear in area H.

Severe icing in area E, a gust front in area F, and microbursts in area H.

Lightning in area D, a gust front in area G, and clear ice in area B.

cold katabatic wind always associated with clouds and heavy showers.

cold katabatic wind with the possibility of violent gusts.

squally warm katabatic wind which occurs mainly in summer.

cold katabatic wind with gusts associated with a maritime air mass.

As a weak trough

As aridge

As a well developed depression

As a secondary depression

3

1

2

4