Settle an argument

solent clown

solent clown

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Karen came home yesterday with her holiday options, and we tried to match days with tides to maximise time out on the water.
The first date was February the 1st. We opened up the ABP tide table to that date. High tide, 11.13, second high tide 01.17....
Now I have lived next to the water all my life, I know it's just over two hours between the two.
I seem to remember there were a few typos in the last table, but this one has many, it seems the times are juxtaposed in some boxes, or am I reading it wrong? I don't see how I can be though.
Anyway it caused a bit of a rumpus as of course Karen sided with ABP and thew written word.
I got called a King Canute wannabee at one point.


IMG_20180111_092539 by mark punksteel, on Flickr
 
Checked with the Admiralty Total Tide, the numbers there match the ABP tables, think your confusion is that on those particular days there is a high tide just before midnight, so the first reported second high tide is actually associated with the previous high tide.

So the second high which goes with the 11.13 first is 13.38 and then looking at the 2nd feb the 2.09 second high is after the 23.41 high on the 1st.

Hope that makes some sense, I am sure my explaination could be clearer,

Neil
 
nrcoyle said:
Checked with the Admiralty Total Tide, the numbers there match the ABP tables, think your confusion is that on those particular days there is a high tide just before midnight, so the first reported second high tide is actually associated with the previous high tide.

So the second high which goes with the 11.13 first is 13.38 and then looking at the 2nd feb the 2.09 second high is after the 23.41 high on the 1st.

Hope that makes some sense, I am sure my explaination could be clearer,

Neil
Click to expand...

yes chap, that makes sense. It is just rather counter intuitive.
 
solent clown said:
Karen came home yesterday with her holiday options, and we tried to match days with tides to maximise time out on the water.
The first date was February the 1st. We opened up the ABP tide table to that date. High tide, 11.13, second high tide 01.17....
Now I have lived next to the water all my life, I know it's just over two hours between the two.
I seem to remember there were a few typos in the last table, but this one has many, it seems the times are juxtaposed in some boxes, or am I reading it wrong? I don't see how I can be though.
Anyway it caused a bit of a rumpus as of course Karen sided with ABP and thew written word.
I got called a King Canute wannabee at one point.
Click to expand...

Simply appears like that in the table becuse the double HW straddles midnight

There would have been a ( 1st) HW on the 31 Jan just before midnight then the HW times for the 1st Feb are a "2nd HW" at 01:17, a "1st HW" at 11:13, a "2nd HW" at 13:3? and another "1st HW" at 23:41

Then a "2nd HW" at 02: 09 on 2nd Feb,
 
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I understand why now, but it is a very unclear and counter intuitive way of setting the table out, in practice for us at least it is that two hour hiatus that is our reference point for all useful calculation.
 
If any of these were written before 2010/11 won't they be out of date. The earthquake of the cost of Japan is supposed to have shorted the length of days and tilted the Earth slightly on it's axis. 1.8 microseconds is the alleged difference with a 17cm shift of the axis. Similarly the one in Chile the year before shortened it by 1.26 and shifted the Earth's axis 8cm.

Just some food for thought ;)
 
Tides Planner does show the two high waters, the first at 1110 (4.8) and the second at 1340 (4.6). Interestingly it also shows a low water at 1240 (4.5) between the two highs.
 
nrcoyle said:
Checked with the Admiralty Total Tide, the numbers there match the ABP tables, think your confusion is that on those particular days there is a high tide just before midnight, so the first reported second high tide is actually associated with the previous high tide.

So the second high which goes with the 11.13 first is 13.38 and then looking at the 2nd feb the 2.09 second high is after the 23.41 high on the 1st.

Hope that makes some sense, I am sure my explaination could be clearer,

Neil
Click to expand...

Does your ATT show the 2nd high as well ? If so, what version are you using please ?
 
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