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What has happened to CAVOK
Lots of ATIS reports in the UK no have Visibilty 10km No Cloud Detected This seems pretty much the same as CAVOK. Any reason why CAVOK isn’t used? Could it be that the automatic weather systems can’t detect clouds at a distance from the airport? |
Been this way for a while.
'NCD' stands for no cloud detected, by the automated system. CAVOK can only be promulgated by a human observer should the criteria be met. |
Thanks for that, thought that might be the reason. |
One wonders what became of Clear and Visibility Unlimited...
- cavuman1 a/k/a Ed |
CAVOK means no Clouds in the TMA below Transition Altitude or 5000 AAL ?
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CAVOK = vis + 10km, no CB, no other cloud below 5,000ft aal and no precipitation.
It's always the last bit people forget. (Nothing to do with being in or under a TMA) |
Originally Posted by cavuman1
(Post 10324556)
One wonders what became of Clear and Visibility Unlimited...
- cavuman1 a/k/a Ed |
Originally Posted by chevvron
(Post 10324590)
I may be wrong but I believe CAVU is only used in the USA.
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What ever happened to oktas . . . . . ?
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UK differences from ICAO Annex 3 (my PDF copy may not be the latest)
"The reporting of clouds in the METAR of operational significance will be introduced on 6 October 2005. From this date, the abbreviation NSC (no significant cloud) will be used if there are no clouds of operational significance, no TCU or CB; the abbreviations CAVOK and SKC are not appropriate." |
A few months back, my local airfield, 3NM to the west, was giving 'No Significant Cloud' on the ATIS. At this time, I sat, with a nice Chardonnay, watching the TS in the overhead. Down to cost at the end of the day. A great shame, as during the present period of inter-glacial climate change, we need the most accurate Wx obs we can get our hands on.
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Originally Posted by vintage ATCO
(Post 10324742)
What ever happened to oktas . . . . . ?
FEW = 1 Okta Scattered (SCT) = 2 to 4 oktas Broken (BKN) = 5 to 7 oktas Overcast (OVC) = 8 oktas. FEW and SCT are 'cloud base' and BKN and OVC are 'cloud ceiling'. But then you were joking weren't you. |
Originally Posted by FlightDetent
(Post 10324808)
UK differences from ICAO Annex 3 (my PDF copy may not be the latest)
"The reporting of clouds in the METAR of operational significance will be introduced on 6 October 2005. From this date, the abbreviation NSC (no significant cloud) will be used if there are no clouds of operational significance, no TCU or CB; the abbreviations CAVOK and SKC are not appropriate." |
chevvron, FEW is 1-2 |
Originally Posted by chevvron
(Post 10325023)
NSC refers to no cloud below 5,000ft aal.
I did look up the CAVOK definition in Annex 3, and the 5000 limit is not there. No operational significance they say. |
Originally Posted by chevvron
(Post 10325023)
NSC refers to no cloud below 5,000ft aal.
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Ummmm..............Chevvron and Floppy Link, what I have never understood is that if FEW, SCT, BKN and OVC are defined in terms of OKTAS, why, oh why, did we ever have to get rid of OKTAS and introduce another level of complexity???
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Originally Posted by GWYN
(Post 10332596)
if FEW, SCT, BKN and OVC are defined in terms of OKTAS, why, oh why, did we ever have to get rid of OKTAS and introduce another level of complexity???
Anyway, I'm surprised EASA hasn't decimalised it again, for it was 'tenths' before oktas... |
types of ATS: Basic, Traffic, Decon, and Procedural. |
Originally Posted by GWYN
(Post 10332596)
Ummmm..............Chevvron and Floppy Link, what I have never understood is that if FEW, SCT, BKN and OVC are defined in terms of OKTAS, why, oh why, did we ever have to get rid of OKTAS and introduce another level of complexity???
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