The Norfolk BroadsThe Norfolk Broads
Username Password
Norfolk Broads Weather

Mon, 11 Apr 2016 7:20 am BST- Light Rain
5 Day Forecast

Wind 2.0 mph @ 40°
48.0°F/8.89°C Humidity 93% Pressure 29.65 (S)

Welcome to The Norfolk Broads Forum
This is THE Worlds Largest Forum devoted to the Norfolk Broads, here you can discuss issues about the Norfolk Broads. Or just somewhere to chat with others interested in the Norfolk Broads area.

Please Help Support The Norfolk Broads Forum
OR

The Norfolk Broads Forum / General Chat / Accurate Tide Tables
login
join
Graphics Off
Search
Forum Members - Book your Hoseasons holiday today, Just call 0345 498 6296

This is a moderated forum Reply to this DiscussionReply to Discussion | Start new discussionNew Discussion << previous || next >> 
Posted By Discussion Topic: Accurate Tide Tables

Similar Threads That Might Help :
Whose tide tables are the most accurate?| Tide Tables| Tide Tables| Tide Tables| site tide tables not working tonight| Tide Tables|

-- Page: 1 2 3

book mark this topic Printer-friendly Version  send this discussion to a friend  new posts last

Simondo
Mar-16-2016 @ 11:59 PM                           Permalink
reply
edit
profile
send p.m.
Forum Regular
Posts: 190
Joined: Feb 2014
Simondo
          

Add To Ignore List
Another to try but not sure on accuracy

Brundall tides

you can obviously change the area

Speleologist
Mar-17-2016 @ 8:54 AM                           Permalink
reply
edit
profile
send p.m.
Been Posting For a Long Time
Posts: 2188
Joined: Feb 2006
Speleologist
          

Add To Ignore List
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

Coriolis
Mar-17-2016 @ 1:05 PM                           Permalink
reply
edit
profile
send p.m.
Forum Regular
Posts: 817
Joined: Jul 2005
Coriolis
          

Add To Ignore List
Fully agree - the tide tables are all generally in close agreement with each other, once you weed out differences in locations (some are given for Yarmouth Bar, other for the Yacht Station, etc, etc), but the water can't read and will do whatever it does on the day.

You won't find tables any more accurate than those already out there, wherever you look - as said at the top, they're only predictions and the world sometimes changes its mind....

dannyboy
Mar-17-2016 @ 1:36 PM                           Permalink
reply
edit
profile
send p.m.
Mardles sometimes
Posts: 3166
Joined: Nov 2005
dannyboy
          

Add To Ignore List
Robin, very helpful post... Do you know what source the BA use?  I am guessing they use the best source they can? But that's just a guess...  Wink

Danny


waterbuoy
Mar-17-2016 @ 2:21 PM                           Permalink
reply
edit
profile
send p.m.
Forum Regular
Posts: 652
Joined: Apr 2011
waterbuoy
          

Add To Ignore List
According to BA's web site they use "Proudman Oceanographic Laboratory: Copyright Reserved http://www.pol.ac.uk"

Clive

Home - IP11 & Away - NR12

Speleologist
Mar-17-2016 @ 2:39 PM                           Permalink
reply
edit
profile
send p.m.
Been Posting For a Long Time
Posts: 2188
Joined: Feb 2006
Speleologist
          

Add To Ignore List
Danny, the ones in Broadcaster use data from Proudman Oceanographic Laboratory. My guess is they are cheaper than UKHO.

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

Coriolis
Mar-17-2016 @ 4:45 PM                           Permalink
reply
edit
profile
send p.m.
Forum Regular
Posts: 817
Joined: Jul 2005
Coriolis
          

Add To Ignore List
NSBA's tables in the Green Book (available foc online, but much better if you're a member, go on, you know you want to)

have always done me proud - right down to hard to misunderstand the right time to transit Yarmouth for Breydon...

Captain-Joshie
Mar-17-2016 @ 5:31 PM                           Permalink
reply
edit
profile
send p.m.
Been Posting For a Long Time
Posts: 1609
Joined: Apr 2005
Captain-Joshie
          

Add To Ignore List
Hi All

Today's slack period to cross Breydon was, according to our tables below, was 11:44 (i.e. Low water +1 hour). So I would've aimed to arrived at Yarmouth Yacht Station at 11:44 ready to go straight across Breydon. Happy Smile  boat-power that I am.

But today in the real world I was at ASDA doing the weekly shop Frown , I took Toby for walkies and noted what the tide was actually doing!!

Time was now 13:49 so way passed the tide tables 'right' time to cross, but what do i actually see? Well the tide is still very slightly coming out of the Bure and the tide is now slightly going into the Yare and Breydon, with the comical sight of a seagull on the water being drifted round in circles at the confluence of the Bure/Yare flows LOL.

So today it looks like the tide tables were out by at least 1 1\2 hours for what I would look at as an ideal crossing time, north to south slight push up the the Yare, south to north not to much of a flow out of the Bure to work against.

But as mentioned above all sorts of factors affect the tide times.

In general I now don't mind being slightly late getting to Yarmouth Y.S. say 3/4hr. as this usually is about right. I have found, more often than not, the tide is usually late doing what it should do LOL.

I always use the Shorebase tables below and print them out a month per page and carry them on board. Though they are also bookmarked on the iPhone and iPad  Smile .

John.

Kind regards, John(Captain
Joshie), Jo & Toby.
'Braveheart' L68 Broom
30/Skipper *
Listening out on PMR Ch4 when
on board*

dannyboy
Mar-17-2016 @ 5:51 PM                           Permalink
reply
edit
profile
send p.m.
Mardles sometimes
Posts: 3166
Joined: Nov 2005
dannyboy
          

Add To Ignore List
Although we do, of course, have the Green Book, the little BA tables are usually more available to hand!

Danny


Sheque1
Mar-18-2016 @ 8:20 AM                           Permalink
reply
edit
profile
send p.m.
Forum Regular
Posts: 656
Joined: Mar 2006
Sheque1
          

Add To Ignore List
remember the surface water (river water not sea) flows out over the top of the sea water for some time.

As an example some years ago, I sailed down to the Stracey Arms during the Three Rivers Race and there was a line of boats moored waiting for the tide to change. They were chucking bits of reed on the water and watching to see if the tide had changed, I sailed straight round the bouy and back up river in  an under sailed(for the broads) Lysander. The tide had changed but not on the surface.

Rough Collies, the best 4 by paws by Far

ncsl
Mar-18-2016 @ 10:30 AM                           Permalink
reply
edit
profile
send p.m.
Mudplug Juggler
Posts: 8375
Joined: Apr 2005
ncsl
          

Add To Ignore List
Salt water weighs more than the same amount of fresh water. This means that fresh water will "float" on top of salt water. This happens when water from rivers flow into the sea.


Lord Paul of Sealand
Official Forum Photographer
Click below for -

ALBUMS
Video

PAGE: 1 2 3

Home Photo Gallery Days Afloat Contact Us
Chat Room Downloads Norfolk Broads @ Amazon Make My Logo
Shops & Businesses Members Gear Norfolk Broads @ EBay Holiday Calendar
Pub Guide Tide Tables SOS List Popular Threads
2017 Calendar Contest Make A Donation Links Hireboat Info
Norfolk Broads @ CafePress FAQ Broads Quiz Forum Events
Advertise With Us Forum Shop Boating Bits Stickys and FAQs Boating Bits Hirecraft List

 

 

 



Copyright © 2005 Y2KInternet, All Rights Reserved.