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HeliTorque Forum Index » Ground School

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met question
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chopperjockey
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PostPosted: Fri Nov 06, 2009 8:31 pm    Post subject: met question Reply with quote

can anyone explain this one? I got it wrong.



Which of the following weather reports could be, in accordance with the regulations, abbreviated to "CAVOK"?
Choose one answer.
a. 24009KT 6000 RA SCT010 OVC030 12/11 Q1007 TEMPO 4000
b. 15003KT 9999 BKN100 17/11 Q1024 NOSIG
c. 04012G26KT 9999 BKN030 11/07 Q1024 NOSIG
d. 29010KT 9999 SCT045TCU 16/12 Q1015 RESHRA NOSIG
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PostPosted: Fri Nov 06, 2009 8:46 pm    Post subject: Reply with quote

I'd pick B, if I remember rightly for CAVOK there's got to be over 9999 metres of viz and no cloud below 5000 ft. Could be wrong.
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PostPosted: Fri Nov 06, 2009 8:46 pm    Post subject: Reply with quote

I am going for b. assuming that 10000ft AAL > MSA it fits all the other criteria on here http://209.85.229.132/search?q=cache:rXfu8vEZPGkJ:www.metweather.com/aviation/news/changes/cavok.html+cavok+met+office&cd=2&hl=en&ct=clnk&gl=uk&client=firefox-a
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PostPosted: Fri Nov 06, 2009 8:48 pm    Post subject: Reply with quote

Yay! Though I didn't know those other two conditions....

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PostPosted: Fri Nov 06, 2009 9:01 pm    Post subject: Re: met question Reply with quote

chopperjockey wrote:
can anyone explain this one? I got it wrong.



Which of the following weather reports could be, in accordance with the regulations, abbreviated to "CAVOK"?
Choose one answer.
a. 24009KT 6000 RA SCT010 OVC030 12/11 Q1007 TEMPO 4000
b. 15003KT 9999 BKN100 17/11 Q1024 NOSIG
c. 04012G26KT 9999 BKN030 11/07 Q1024 NOSIG
d. 29010KT 9999 SCT045TCU 16/12 Q1015 RESHRA NOSIG




Correct, answer is B. Vis is all the 9's cloud is above 5000ft and no significant weather.



Its worth noting that you wouldnt normally see a METAR like that (showing cloud at 10000ft) unless it was a report from a military station (they report cloud as high as they can detect it).

This is one of those questions like we talked about in a previous thread, where the CAA expects you to only apply basic knowledge of MET to get the correct answer. If i couldn't have worked out that it was a basic met question i would have argued that the answer isn't clear.

Trivia: Military METARs are produced by officers from the MET OFFICE, unlike in the old days where all large airports had their own dedicated met office now its only military stations and london heathrow. Outside of those met observations are compiled by staff at the air traffic unit who have completed the met observers course in belfast.
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PostPosted: Sat Nov 07, 2009 11:08 am    Post subject: Reply with quote

Thanks fellas, it was the 5000 feet bit that caught me out. I will definately not forget this one now. Embarassed
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