"David Buttery" wrote in message
...
On Thu, 18 Jun 2009 20:33:50 +0100, Phil Layton wrote:

snip
Incidentally, we hope to change LVP introduction from BKN002 to BKN001
soon. We have agreement in principle from the regulator to apply LVPs
when the cloud ceiling is below 200ft as opposed to 200ft or below -
which in practice means anywhere from 100 to 199ft.

For we clueless ones... that seems to be a change of precisely one foot,
and thus it seems strange that it's important - but I'm assuming there's
more to it than that?


Sorry Dave. The ceiliometer records down to the nearest 100ft, so when we
currently have 299ft (being a bit extreme to make a point) cloud ceiling it
is recorded as 200ft OVC002. When it is 180 ft it is recorded as 100ft
OVC001. So the change is from 1 foot to 100feet.

Phil