On Wednesday, August 12, 2015 at 5:13:27 PM UTC-4, xmetman wrote:
On Wednesday, 12 August 2015 16:42:47 UTC+1, Desperate Dan wrote:
If my memory serves me correctly, CBRs in the early 70s only recorded up to 4000ft.

Yes you are correct.

The cloud base recorder was typical Met Office - designed by someone with an elecronics background and neither an observer or a forecaster. The chart was no more than 3x3" window in a large box (18x12" approx) of valves and circuits, it even had some kind of meter that was as big as the chart that recorded the cloud base!

Around the same time there was a visiometer that output to a Kent chart recorder which is probably what the CBR should have employed and would have been a lot more useful. I bet that came from outside the Office.

It's sad but I can still remember how it sounded as the arm moved up the chart...

Wasn't there a paper on the dispersal of night time cirrus at daybreak?

=======

Yes, it might have been that way around rather than, as I vaguely remembered it, its putative dispersal overnight and reappearance by day. The simplest and most likely explanation, of course, being that to which Will alluded - observers (and I include myself) estimating non-existent cirrus overnight (at usually 3 oktas) then seeing that there was none at daybreak.

Stephen.

On 12/08/2015 20:38, Len Wood wrote:
On Wednesday, August 12, 2015 at 7:15:39 PM UTC+1, Dave Cornwell wrote:
On 12/08/2015 14:16, Asha Santon wrote:
I just made a new photo to replace an old one made by dear mama.

Could some kind person tell me what type of cloud this is?
http://pictures.opcop.org.uk/new99.htm

-------------------------------------------------------------
Would love to help Asha but .....

I've looked at clouds from both sides now
From up and down and still somehow
It's cloud illusions I recall
I really don't know clouds at all.
Dave
================================================== ===================
Surely you know S****atus Dave?
;-)

Len
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Used to - very well :-)

On 12/08/2015 20:12, Asha Santon wrote:


Ancient music
-----------------------------------------
Yep, I am getting that way myself. Could do with a bit of spicing up :-)
Dave

On 12/08/2015 22:13, xmetman wrote:
On Wednesday, 12 August 2015 16:42:47 UTC+1, Desperate Dan wrote:
If my memory serves me correctly, CBRs in the early 70s only recorded up to 4000ft.

Yes you are correct.

The cloud base recorder was typical Met Office - designed by someone with an elecronics background and neither an observer or a forecaster. The chart was no more than 3x3" window in a large box (18x12" approx) of valves and circuits, it even had some kind of meter that was as big as the chart that recorded the cloud base!

Around the same time there was a visiometer that output to a Kent chart recorder which is probably what the CBR should have employed and would have been a lot more useful. I bet that came from outside the Office.

It's sad but I can still remember how it sounded as the arm moved up the chart...

Wasn't there a paper on the dispersal of night time cirrus at daybreak?

I doubt that any observer or forecaster could have designed one. In any
case, they were at airfields and no one at airfields was interested at
cloud as high as 4000 feet so that's probably why they were limited. I
think the replacement laser ones went higher, but then Heathrow refused
to have one - can't have lasers cutting planes in two if they flew over it!

Kent chart recorders were probably ordered by Met office staff - they
were for industrial furnace temperature measurement and the like; they
weren't any good for the precision of temperatures we required.

On 12/08/15 15:57, Alan White wrote:
On Wed, 12 Aug 2015 14:16:46 +0100, Asha Santon
wrote:

If there's somewhere I can look such things up to avoid bothering
the ng please do tell.

Google 'international cloud atlas' and download the pdf
'INTERNATIONAL CLOUD ATLAS - Knmi'.


Thank you. We don't use the 'g' thing but I obtained volumes 1 and 2
from the WMO library. I also found this ...

http://www.clouds-online.com/index.htm

.... along with a possibly nice proggy to use while out and about if
reading the book on a small screen while walking becomes suicidal.

Thanks again.

--
A S
http://nature.opcop.org.uk
http://pictures.opcop.org.uk