Confused by Le Mont St Michel tide table

Sep 20th, 2007, 04:56 PM
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Confused by Le Mont St Michel tide table

I am traveling to LMSM in Oct & want to make sure I'm there to see the tide come all the way in. I was there a few years ago & missed the sight by 2 days. I understand that every high tide does not surrond the island and I have read the tide table (http://www.otmontsaintmichel.com/hor...tobre07_gb.htm). It says to be there 2 hours ahead. It seems that the action is around the 27th but can anyone tell me what time I have to be there and what does Range 109 means? Thanks for the help!
semmy is offline  
Sep 20th, 2007, 05:00 PM
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It looks like the link lost a "-". Here's the correct link
http://www.ot-montsaintmichel.com/ho...tobre07_gb.htm
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Sep 20th, 2007, 06:30 PM
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I'm not sure what time you should be there, but the table seems to say that if you want to observe the entire length of the tide rising, you should be there about two hours ahead of the peak tide point -- at least in spring, which it refers to. I don't know how that changes in October.

The range is the difference in the high and low tide points. I think 109 means 1.09 meters and 87 means .87 meters. They don't show the height of the low tides on the table to check that.
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Sep 21st, 2007, 03:58 AM
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Ok. That helps, I think. The 2nd table I attached is the table for Oct, so does that mean I have to show up at either 6:32 or 18:55 on order to see the show? I didn't think it happened twice in ine day. Thanks Christina.
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Sep 21st, 2007, 04:39 AM
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We were at MSM in early April a few years ago and by chance experienced the tides. There was a high tide at approximately 7 pm and then the next morning around 7 but we were not aware that the tides occurred twice. So if you are staying overnight be aware of this.
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Sep 21st, 2007, 05:04 AM
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The tides at Mont St. Michel are what's referred to as "semi-diurnal," which means there are two highs and two lows of approximately equal elevation in each 24-hr (approximately) period. That's the normal tide pattern in most parts of the world, but other patterns are possible depending on local conditions.

The tidal range at Mont St. Michel is much larger than 1.09 meters (about 3.5 ft), so it's not immediately apparent to me what the 109 "range" refers to. Even 10.9 meters seems too small - no matter, the more important number for you is the height that's listed in the table, and you're correct that the highest (and also the lowest, though they're not listed) tides occur on the 27th. In most tide tables the "height" refers to height above mean sea level (MSL), and low tides, also referenced to MSL, will be a negative number. That would work out to a minimum tidal excursion on that day of at least 14 meters, or about 50 ft - impressive by any standard.
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Sep 21st, 2007, 06:00 AM
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Christina, spring in this case has nothing to do with the season- it refers to the spring tide. Tides are highest at new and full moon when the gravitational pull of the sun and moon combine.

Semmy the dates given in the table are the dates of a tide high enough to surround the Mont. Other dates are not mentioned. There is roughly 14 metres between the highest and lowest tides so the 109 would suggest a 10.9 metres difference in October.
hetismij is offline  
Sep 21st, 2007, 06:40 AM
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I can't help you with the tide table interpretation but wanted to mention that you might want to read a murder mystery set at Mt.Sant Michel featuring the tide:
Old Bones by Aaron Elkin
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Sep 21st, 2007, 08:19 AM
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I didn't think that could be 10.9 meters (and I think it would have to be either cm or m for it to be listed as 109) or they would have had a decimal point in it. I thought 1.09 meter was a little small, but not impossible. If it is 10.9 meters, they should either have a decimal in it or have it be in cm.


hetismj, is it really possible to have a range in tide that big at Mont St Michel? 10.9 meters is a very big tidal range, so that is impressive. Wikipedia, if it is accurate, says that coastal tidal ranges are typically 0.6 m to 3 m, and the biggest one is the world is 17m in Canada. So, a 14 m range should be something to see!
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Sep 21st, 2007, 09:04 AM
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http://tinyurl.com/279r5x under tides, or http://tinyurl.com/3d784r That is the highest to lowest tide.
The biggest tidal range is in the Bay of Fundy in Canada, followed by the Bristol Channel.
hetismij is offline  
Sep 21st, 2007, 10:00 AM
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hi, semmy,

what you are looking for is the highest tide which appear to be roundabout the 25-27th Oct as you have already spotted. [yes high and low tides happen everywhere approx 6 hours apart every day, so there are two high tides and two low tides in every 24 hours]

AS they don't give the low tide heights as some tide tables do, you can't work out the range for yourself, but 10.9m does seem about right. [1.09 metres would be nothing in tidal terms]

to work out where the tide wil be at any particular time, you must apply the "rule of 12ths", that is to say:

allowing 12 hours from low tide to high tide and back again,

in the first hour, it will rise 1/12 of the range, in the 2nd hour, 2/12, in the third hour 3/12, in the 4th hour 3/12, in the 5th hour 2/12, and in the last hour 1/12 [high tide] and then the same back down to low tide again.

so the stream is running fastest in the middle of the period between low and high tide, and is moving least at the very top or bottom.

Hence if you get there about 4 hours after low tide, the tide wil be mostly in.

i hope that helps



regards, ann
annhig is offline  
Sep 21st, 2007, 10:01 AM
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ps the highest tide appears to be at 9pm on the 26th.

if you got there by 6pm you would be in good time to see it come in.
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Sep 21st, 2007, 10:02 AM
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sorry, just checked - it is the 27th.
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Sep 21st, 2007, 04:06 PM
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Wow! Thanks to all of you. So, annhig, If I understand correctly, if I arrive by 9PM (20:00) it will be high tide. They say to get there 2 hours ahead to actually see the tide come in, so that would make it 7PM. But what about the morning. If we arrived around 6:30AM, on the 27th, would we see basically the same thing as in the evening?
The tide does come in a very long way & quite quickly - "as fast as a horse can run". It is sufficient to wash a bus away if it is parked too close, so 10.9 meters probably is correct.
Finally, mysteries are my favorite! I will definitely check out "Old Bones". Thanks Vttraveler.
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Sep 21st, 2007, 04:29 PM
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On the 27th, high tide is at 8:32am. So, you should arrive around 6:30 to watch it come in.
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Sep 21st, 2007, 05:55 PM
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Fantastic. I'll let you all know if we get to see it. Thanks
semmy is offline  
Sep 22nd, 2007, 09:55 AM
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hi, semmy,

you've almost got it, except 9.pm is 21.00.

if you arrive at 6pm/18.00 the tide still has 3 hours to come in fully, and you will see it at its fastest, slowing down towards 9pm.

the same applies in the morning, of course - if you get there at 6.30 am on the 27th, it will have about 2 hours to go to high tide.

have a great time,

regards, ann
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