"Norman" wrote in message
...
Len Wood wrote:
On Friday, 30 October 2015 09:17:54 UTC,
One thing about Dartmoor, Graham has pointed out that gale frequency
has
dropped right off and it is possible that the decrease in wind speed
has
decreased the orographic enhancement (which is where we get a lot of
our
rain). So it is perfectly possible for rainfall to decrease or stay
the
same on high ground and increase on the coast, especially in winter!
Have winds speeds decreased in Plymouth like Penzance?
Hi Len, again!
Having just read Jim's excellent response and queries in this thread,
I'm
getting interested now in my own hypothesis which I'd dearly like to
test.
If I gave you a list of "orographic enhancement days" (moist SW'ly
winds),
would you be able to extract the Plymouth rainfall (and wind) data for
me?
If we do this well it could end up as a super paper? What do you think?
Could be a lot of work for me initially though to find the days, but
that's
science - hard work.
Will
--
http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm
Will Hand (Haytor, Devon, 1017 feet asl)
---------------------------------------------
1)Regarding dropbox, I don't think you have to sign up to get the files.
I might be wrong.
You will get a window appearing inviting you to sign up, but if you wait
a
few seconds the file should appear anyway.
I will email you the file nevertheless Will.
2) Sadly Will, I do not have any wind data for Plymouth.
Historical wind datasets are extremely difficult to get hold of for
any
station. They are often not hourly measurements, and are of questionable
use
if not hourly.
The DWRs of course have some wind information up to 1980.
Len
Wembury
--------------------------------------------------------------------------
Hourly obs from Mountbatten from Jan 1973 to the present day are available
for
free from NCDC. A good starting point is
http://gis.ncdc.noaa.gov/map/viewer/...ourly&layers=1
Unfortunately, there is a bit of a glitch in the NCDC software. The winds
in
their database are given in mph, converted from the original knots. From
time
to time the software seems to think that the original report is in m/sec
so the
mph conversion is spuriously high. Fortunately, the error is sufficiently
large
for the spurious obs to be fairly easily identified.
If you need any assistance in getting to the data from the above link let
me
know and I'll try to steer you through it.
Thanks Norman, that's brilliant.
Will
--
http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm
Will Hand (Haytor, Devon, 1017 feet asl)
---------------------------------------------