On Thursday, December 7, 2017 at 10:04:38 PM UTC, John Hall wrote:
In message , N_Cook
writes
On 07/12/2017 20:22, Stephen Davenport wrote:
At least through the 1980s the convention at the Met Office was to
label midnight as 00:01 Z.

Stephen.


NTSLF cant even get the top of each hour right.
eg
http://www.ntslf.org/data/realtime?port=Portsmouth
come relaying the tidegauge readings for say 22:00 tonight , their www
clock will say 21:60

Good grief! If they can't even get that right, what confidence can one
have that they are reporting the gauge readings correctly?
--
John Hall "George the Third
Ought never to have occurred.
One can only wonder
At so grotesque a blunder." E.C.Bentley (1875-1956)

For sea conditions I rather like this site - http://www.channelcoast.org/data_man...e_data/charts/

Click the site name and you get this (in the case of Perranporth) http://www.channelcoast.org/data_man...arts/?chart=76

As you can see, whilst the significant wave height (the figure normally quotes) is now around 4m, the peak wave height is now 7m - quite large, but note how short the period is, so not powerful, just a typical rough sea.

In Cornwall, away from the estuaries, it's wave height/period & wave setup surges which are normally the most important, rather than the tide being 0.3m above astronomical predictions.

You also get SST, wave direction & full data on the wave spectra http://www.channelcoast.org/data_man...a&disp_option=

It's really rather good, pointed out to me by Nick G originally, if I remember rightly.

Anyway, as northerly blasts go, pretty half hearted here, still around 6C.

Graham
Penzance