uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged.

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Old January 14th 19, 10:09 PM posted to uk.sci.weather
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Default Tide Tables for the year

Hello

Does anyone know where you can get tide high/low heights and times for the whole year online or is this typically a "paid-for" service. Not having much luck...the furthest I can get ahead is a week...

Cheers
Richard

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Old January 15th 19, 07:38 AM posted to uk.sci.weather
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Default Tide Tables for the year

On Mon, 14 Jan 2019 15:09:15 -0800 (PST), Richard Dixon
wrote:

Hello

Does anyone know where you can get tide high/low heights and times for the whole year online or is this typically a "paid-for" service. Not having much luck...the furthest I can get ahead is a week...

Cheers
Richard


I use WXtide http://www.wxtide32.com/

It will calculate tide to 2037 I have never found it more than a few
minutes out from official calculations and the official times are only
forecasts and subject to weather variations etc etc.

Jeff

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Old January 15th 19, 08:27 AM posted to uk.sci.weather
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Default Tide Tables for the year

On 15/01/2019 08:38, wrote:
On Mon, 14 Jan 2019 15:09:15 -0800 (PST), Richard Dixon
wrote:

Hello

Does anyone know where you can get tide high/low heights and times for the whole year online or is this typically a "paid-for" service. Not having much luck...the furthest I can get ahead is a week...

Cheers
Richard


I use WXtide
http://www.wxtide32.com/

It will calculate tide to 2037 I have never found it more than a few
minutes out from official calculations and the official times are only
forecasts and subject to weather variations etc etc.

Jeff

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Agreed for ports that are close to a pure sine curve for the tide plot.
For the likes of Southampton, skewed and double high tide, due to a lot
of shallow water harmonics required for a closer harmonic summation,
even then useful to perhaps 0.2m in heights and half an hour for first
high water times.
You'll find printed/paid-for sources , other than UKHO, that again do
not all agree , but then they do not use the IISTR 50 harmonic
constants of the UKHO and regular validation checks.


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Old January 15th 19, 05:07 PM posted to uk.sci.weather
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Default Tide Tables for the year

On Tuesday, January 15, 2019 at 8:38:31 AM UTC, wrote:

I use WXtide http://www.wxtide32.com/


Hi there

Thanks for this - will take a look. Amazed that you can't find this sort of data online though.

Richard
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Old January 15th 19, 07:28 PM posted to uk.sci.weather
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Default Tide Tables for the year

Richard Dixon wrote:

Hello

Does anyone know where you can get tide high/low heights and times
for the whole year online or is this typically a "paid-for" service.
Not having much luck...the furthest I can get ahead is a week...

Cheers
Richard


Hi Richard,

This one might give you what you want.

https://tides.mobilegeographics.com/


Cheers, Norman

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
https://peakdistrictweather.org
twitter: @TideswellWeathr


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Old January 15th 19, 07:51 PM posted to uk.sci.weather
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Default Tide Tables for the year

On 15/01/2019 18:07, Richard Dixon wrote:
On Tuesday, January 15, 2019 at 8:38:31 AM UTC, wrote:

I use WXtide http://www.wxtide32.com/


Hi there

Thanks for this - will take a look. Amazed that you can't find this sort of data online though.

Richard


You could always generate your own tables.
Sets of harmonic constants can be found in UKHO output for UK ports (not
the most recent for commercial reasons).
I had reason to generate full tidal curves for an event in 1924 and the
graphical plot available on the 2GBP UKHO historic data was not enough
resolution.

The time origin for the following is 00:00 26 Nov 1924 to avoid big
number Julian day hours, amplitudes in metres
MSL 3.036m
amplitudes and phases for Southampton(sine and positive phases form for
my own convenience, usually expressed as cosine summation and lags and
timing from the most recent "Julian " century [J2000? ,I forget the
proper term]). The harmonic angular velocities are fixed wrt moon and
sun ,in the following.
M2
+(1.3594 * sin(0.505868049 * x + 2.727388038 ))+
S2
(0.4066 * sin(0.523598775 * x + 1.485351304 )) +
N2
(0.27798 * sin(0.496366918 * x + 2.417776917 ))+
k1
(0.0875 * sin(0.26251617 * x - 0.664718536 ))+
O1
(0.03414 * sin(0.243351878 * x +1.02520388 )) +
M4
(0.279475* sin(1.011736098 * x +1.643132654))+
2MS6
( 0.0948963* sin(1.029466825 * x +1.82214 ))+
2SM6
(0.1856 * sin(1.535334877 * x - 0.556910409 ))+
M6
(0.1753 * sin(1.517604149 * x -0.536804469 )) +
2MN6
(0.064 * sin(1.527105283 * x -0.681902743 ))+
MN4
(0.07498 * sin(1.002234979 * x + 1.699629457 ))

The resulting plot for a November date allowed me to superimpose a
tide-gauge plot of the time , to get the storm surges of the time.
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Old January 15th 19, 08:48 PM posted to uk.sci.weather
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Default Tide Tables for the year

On Tuesday, January 15, 2019 at 8:28:39 PM UTC, Norman Lynagh wrote:

Hi Richard,

This one might give you what you want.

https://tides.mobilegeographics.com/


Great - many thanks
Richard
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Old January 16th 19, 06:10 AM posted to uk.sci.weather
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Default Tide Tables for the year

On 14/01/2019 23:09, Richard Dixon wrote:
Hello

Does anyone know where you can get tide high/low heights and times for the whole year online or is this typically a "paid-for" service. Not having much luck...the furthest I can get ahead is a week...

Cheers
Richard


I use

http://www.climbers-club.co.uk/infor...l-information/





--

Paul Hyett, Cheltenham
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Old January 16th 19, 08:52 AM posted to uk.sci.weather
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Default Tide Tables for the year

On Wednesday, January 16, 2019 at 7:10:18 AM UTC, vidcapper wrote:
On 14/01/2019 23:09, Richard Dixon wrote:
Hello

Does anyone know where you can get tide high/low heights and times for the whole year online or is this typically a "paid-for" service. Not having much luck...the furthest I can get ahead is a week...

Cheers
Richard


I use

http://www.climbers-club.co.uk/infor...l-information/





--

Paul Hyett, Cheltenham


I think the problem with that site, is that there are so view ports. E.g. It jumps from Lizard point in west Cornwall, to Dartmouth.

Given that the difference between high tide at Sennen and St Ives, about 15 miles along the north cost, is typically 30 minutes, the issue is clear. Made worse by the fact there are some big discrepancies between it and the official tide tables. On Thursday the Hydrographic Office (via Easytide) shows St Ives as 13:48, your site 13:18. The height difference is also huge (4.7m compared to 5.5m)

So, potentially, data using a nearby port on your site could be an hour out.. Then if climatic conditions pushed it further out? OK for checking if high tide was morning or afternoon for a couple of hours on the beach I suppose, but I certainly wouldn't use it for anywhere I might get cut off by the tide. Perhaps that's why it's on a climbers club site, you might have to end up climbing the cliff!

Graham
Penzance


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Old January 16th 19, 11:31 AM posted to uk.sci.weather
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Default Tide Tables for the year

On 16/01/2019 09:52, Graham Easterling wrote:
On Wednesday, January 16, 2019 at 7:10:18 AM UTC, vidcapper wrote:
On 14/01/2019 23:09, Richard Dixon wrote:
Hello

Does anyone know where you can get tide high/low heights and times for the whole year online or is this typically a "paid-for" service. Not having much luck...the furthest I can get ahead is a week...

Cheers
Richard


I use

http://www.climbers-club.co.uk/infor...l-information/





--

Paul Hyett, Cheltenham


I think the problem with that site, is that there are so view ports. E.g. It jumps from Lizard point in west Cornwall, to Dartmouth.

Given that the difference between high tide at Sennen and St Ives, about 15 miles along the north cost, is typically 30 minutes, the issue is clear. Made worse by the fact there are some big discrepancies between it and the official tide tables. On Thursday the Hydrographic Office (via Easytide) shows St Ives as 13:48, your site 13:18. The height difference is also huge (4.7m compared to 5.5m)

So, potentially, data using a nearby port on your site could be an hour out.. Then if climatic conditions pushed it further out? OK for checking if high tide was morning or afternoon for a couple of hours on the beach I suppose, but I certainly wouldn't use it for anywhere I might get cut off by the tide. Perhaps that's why it's on a climbers club site, you might have to end up climbing the cliff!

Graham
Penzance




For the UKHO tide times, presumably for all ports ,but certainly
Southampton ,one of the most awkward.
If meteorologically flat around the time of high tide and flat for the
previous 6 hours or so for the Eng Channel area, looking at a tide-gauge
reading to +/-0.01m it is surprising how often the published time is the
actual time to the nearest 5 minutes, heights a bit more problematic
requiring being met flat in the whole UK sea area for at least a day.


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