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The Norfolk Broads Forum / General Chat / Accurate Tide Tables
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Posted By Discussion Topic: Accurate Tide Tables

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Ifafa
Mar-16-2016 @ 11:33 AM                           Permalink
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Can anybody recommend an accurate source for tide tables please?
I appreciate that they are actually predictions but having spent so much time on the river, I can conclude that many web sources are wholly inaccurate even as close as 45 minutes away from Great Yarmouth.


ncsl
Mar-16-2016 @ 12:32 PM                           Permalink
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Have you looked at www.shorebase.co.uk  as they have always proven to be good. ?



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Ifafa
Mar-16-2016 @ 2:48 PM                           Permalink
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Do you have a direct link?
I've tried opening on a smart phone and did not see any tide table link.
Cheers


Hylander
Mar-16-2016 @ 2:54 PM                           Permalink
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Mardles sometimes
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We always use the Tide Table at the bottom of this page.

Women dont nag they just
point
things out...



M

boat-mad
Mar-16-2016 @ 4:19 PM                           Permalink
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Here is a direct link and you can get a low water tide table well in advance of your trip.
http://www.norfolk-broads.org/tides/tide_report.asp?

Here is a link to The Broads Authority tide table which you can't get far in advance but would have to wait till approx a month of your trip.  On the plus side it provides low water and high water .
http://www.broads-authority.gov.uk/boating/navigating-the-broads/tide-information


Kind Regards
Alan...
www.mynorfolkbroadsboating.co.uk/

Marshman
Mar-16-2016 @ 4:51 PM                           Permalink
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Perhaps the real issue is that the tides don't themselves have access to the tables?

Not unusual for the tides to be quite a long way out due to other factors especially the further you are away from the sea.

LeoMagill
Mar-16-2016 @ 6:59 PM                           Permalink
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I've had to wait around for an hour before in open water waiting for the tide to happen to get into the Ore before, it's always going to be worse in the rivers themselves.
I doubt any will be more or less acurate as the broads ones will be a set of corrections to lowestoft times as will any proper coastal ones as it's the nearest standard port.

If you don't like what I say don't hurl abuse at the boat, I've sold it...

dannyboy
Mar-16-2016 @ 7:00 PM                           Permalink
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I like that Marshman!

We use the BA tide tables on board (and the website at other times) and they are usually not far off but, in the end, looking over the side helps. It depends what you want them for, as to how vital it is that they are bang on accurate. If you are planning a Breydon crossing, then allow time to moor up if necessary to wait for slack water, rather than aim for exactly the time you think the tables indicate.

I think the various options use the same source material (please correct me someone, if I have that wrong), but opinions differ as to the amount of time you should add to the Yarmouth times to get accurate tide times for your boating area.

At PH where I moor, I usually add 4, but some tables say 3...



Danny


Simondo
Mar-16-2016 @ 11:59 PM                           Permalink
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Another to try but not sure on accuracy

Brundall tides

you can obviously change the area

Speleologist
Mar-17-2016 @ 8:54 AM                           Permalink
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There are several issues affecting the accuracy of tide tables. These relate to both how the prediction is created and how external factors affect what happens.

To take the first, the most accurate predictions available in this country come from the UK Hydrographic Office. This is the source used for naultical almanacs and many published tide tables for ports. However ther data is copyright and there is a fee to republish it. This means that many websites use free data from simpler models that are less accurate.

Next are the external factors. Wind strength and direction, atmospheric pressure, rainfall and the condition of the ground in the catchment can all affect the height or time of the tide or both. Tide heights will often be lower than prediction in high pressure and higher in low pressure. An onshore wind can delay the ebb. Heavy rainfall can delay the flood, increase the height etc. The extent of the impact of rainfall can be increased if the ground is saturated or baked hard.

There is another factor, particularly noticeable on the lower Bure near Great Yarmouth. After the tide turns the flow will still be downstream on the Bure, even thought the tide is rising. Later in the flood (after slack water), although the flow at depth is upstream, the flow on the surface can be downstream, which gives an impression that the tide is still ebbing when it actually isn't. After heavy rain this phenomenum can last throughout the flood, but it is at the surface only.

Edited for typos.

Robin
www.robin.me.uk
"Posthabui tamen illorum mea seria ludo"


This message was edited by Speleologist on Mar-17-16 @ 1:41 PM

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