Refer to figure.
The chart shows isobars and fronts at 1200 UTC on October 10. Which of the following reports reflects weather development at Zurich Airport (LSZH)?
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A
TAF LSZH 101500Z 1016/1101 VRB02KT 8000 NSC BECMG 1016/1018 3500 MIFG BECMG 1018/1020 1500 BCFG BECMG 1020/1022 0100 FG VV001=
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B
TAF LSZH 101500Z 1016/1101 23012KT 6000 RA BKN012 OVC030 TEMPO 1020/1023 22025G40KT 1600 +SNRA BKN003 OVC015=
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C
TAF LSZH 101500Z 1016/1101 32008KT 9999 SCT030TCU TEMPO 1022/1101 32020G32KT 3000 TSRA BKN020CB=
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D
TAF LSZH 101500Z 1016/1101 05020G35KT 8000 BKN015 TEMPO 1017/1020 05018KT 0300 +SHSN VV002=
Refer to figure.
LSZH is situated in the middle of two high pressure systems.
The relatively wide spacing of isobars around the high results in relatively light winds.
Buys Ballots’ law tells us that the wind will move around an anticyclone in a clockwise direction in the Northern Hemisphere, so we can expect light wind from NW.
Anticyclonic Weather:
> Summer
Cloud: None except on the edge of the anticyclone
Precipitation: None
Visibility: Generally moderate with haze
Temperature: Dependent on type
Winds: Light
> Winter
Cloud: Extensive stratus with a low base and limited vertical extent
Precipitation: Possibly drizzle
Visibility: Generally moderate to poor with mist and fog likely
Temperature: Relatively warm
Winds: Light
Considering that the chart refers to the 10th of October at 1200 UTC, let's take a look at the possible answers and see which TAF forecast will fit the conditions described above.
TAF LSZH 101500Z 1016/1101 VRB02KT 8000 NSC BECMG 1016/1018 3500 MIFG BECMG 1018/1020 1500 BCFG BECMG 1020/1022 0100 FG VV001= >>> correct
1016/1101: Period of validity, beginning on day 10 at 16 UTC/ ending on day 11 at 01 UTC
VRB02KT: Wind Variable 2 kt
8000: Visibility 8000 m
NSC: No Significant Cloud
BECMG 1016/1018: on day 10 between 16 and 18 UTC the weather changes to the conditions listed below
3500: Visibility 3500 m
MIFG: Shallow Fog
According to the remaining section of the TAF forecast, the radiation fog is going to thicken and visibility will drop by 20 to 22 UTC.
The weather described corresponds to the expected weather associated with a high pressure area in October.
TAF LSZH 101500Z 1016/1101 23012KT 6000 RA BKN012 OVC030 TEMPO 1020/1023 22025G40KT 1600 +SNRA BKN003 OVC015= >>> not correct
1016/1101: Period of validity, beginning on day 10 at 16 UTC/ ending on day 11 at 01 UTC
23012KT: Mean wind direction of 230° and mean wind speed of 12 kt > wind speed is relatively high value for a high
RA: Rain > unlikely in a high
TAF LSZH 101500Z 1016/1101 32008KT 9999 SCT030TCU TEMPO 1022/1101 32020G32KT 3000 TSRA BKN020CB= >>> not correct
1016/1101: Period of validity, beginning on day 10 at 16 UTC/ ending on day 11 at 01 UTC
9999: Visibility of 10 Km or more > doesn’t match with the expected moderate visibility
TCU: Towering cumulus > don’t match with a high pressure system
TEMPO 1022/1101: Temporary meteorological changes, beginning on day 10 at 22 UTC/ ending on day 11 at 01 UTC
05020G35KT: Mean wind direction of 050°, mean wind speed of 20 kt, indicator of Gust, max wind speed (gust) of 35 kt > excludes this option
TSRA: Thunderstorms with rain > excludes this option
TAF LSZH 101500Z 1016/1101 05020G35KT 8000 BKN015 TEMPO 1017/1020 05018KT 0300 +SHSN VV002= >>> not correct
1016/1101: Period of validity, beginning on day 10 at 16 UTC/ ending on day 11 at 01 UTC
05020G35KT: Mean wind direction of 050°, mean wind speed of 20 kt, indicator of Gust, max wind speed (gust) of 35 kt > excludes this option
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