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avoiding high tides

Ottawa, Canada
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avoiding high tides

Does someone know where to look to see the tide table for Venice? We would like to visit and not be flooded out in St. Mark's Square this time!

Sydney, Australia
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1. Re: avoiding high tides

It is impossible to predict much in advance whether a tide will produce any flooding. Most of the time, a high tide produces no floods at all. Sometimes, particularly in winter, the weather (particularly strong winds) can combine with a high tide to give aqua alta. But whether this combination will occur is not known until a day or so beforehand.

UK
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for Venice
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2. Re: avoiding high tides

It does not happen that often depends when you go November to February seems more likely, but if there is Acqua Alta, it is San Marco Piazza which is most affected, the lowest part of Venice

Venice
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3. Re: avoiding high tides

YOu can check the commune tide timetables they are a bit complicated to understand but they are only reliable for the moon tides as stated for the weather factors who knows?

Verona, Italy
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4. Re: avoiding high tides

Anyway, the tidal forecasts for the lagoon are here:

…venezia.it/flex/…1748

Ciao

Francesco

Edited: 15 September 2010, 17:08
Venice, Italy
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for Venice, City of Venice
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5. Re: avoiding high tides

http://www.comune.venezia.it/maree/ is always updated for the next few days in the future.

At www.ispravenezia.it/ispra/index.php… there is the forecast (in Italian) has the "astronomical" tides for the rest of 2010 to which the meteorological and environmental factors (wind, rain, sea currents, pressure, construction near the openings in the lagoon) add their two cents. Since one of the most important aspects is wind, it can only be forecast a few days in advance, giving rise to the first forecast link above.

Days with already high astronomical tides are more likely to become higher with the other factors, but the astronomical tide, without other factors, would not generally ever cause flooding levels by itself, so the annual charts are only relatively useful.

And even when it is happening, the tidal forecasts can change hourly to to changeing weather conditions, as extremely high level tide forecasts can be downgraded to no flooding or minor levels at the last minute, or can last an hour or two longer than expected because the tide unexpectedly "just doesn't want to flow back out" (as happened last December with the record "acqua alta").

One thing the annual charts can be used for well, on the days you are going to be in Venice, is planning *around* eventual possible high levels.

If the tides on the day you are visiting San Marco peak at 7am and 8pm, you know pretty much for sure that you can walk anywhere from mid-morning to late afternoon even if there were "acqua alta" that day, and that you could only have problems early morning or dinner time.

Venice, Italy
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for Venice, City of Venice
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6. Re: avoiding high tides

Just to clarify:

.

the first link http://www.comune.venezia.it/maree/ redirects to the link Francesco provides, but is easier for me to remember, even if I don't have the bookmark handy, and *DOES* take into consideration the evaluation of weather and other factors. The forecast tends to be more accurate for today, and less for three days (as just about any forecast) so don't panic if you see a 120cm levels three days before your arrival.

.

The second link with the astronomical (moon) tides has charts "in Italian", but which being graphic, don't really need any Italian to interpret... The introductory text is all in Italian, but the numbers are numerical, not long-hand "Italianical (uno cento mille)".

Surrey
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7. Re: avoiding high tides

In my experience I've found a full moon to be a good indication of the risk of acqua alta in St Mark's Square. The advice above about checking online to see the timing of the twice daily high tides is very useful for visiting St Mark's Square. On a visit last November, one morning the Piazza was totally flooded, necessitating using the duckboards. This was at about 11.30 am. When we crossed the Piazza at 2.30pm, not only had all the water disappeared, the stone paving was totally dry!

UK
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8. Re: avoiding high tides

You will get extra high tides (called spring tides - not because they occur in spring but because they 'spring' up higher than average) at full moon AND at new moon. This is because the Sun, Moon and Earth are in alignment. Easy to understand when it's new moon, because Sun and Moon are pulling in the same direction. Harder to understand at full moon, because you would think that the Moon is pulling in the opposite direction to the Sun. At the two half moons each month you get neap tides. That's when the Moon's pull is at right angles to the Sun's, so high tide isn't so high and low tide isn't so low.

But there are two high tides each day, and therefore two low tides, so it should be easy to find a time when PSM is not under water, even at a time of acqua alta.

Edited: 16 September 2010, 06:45
Taylorsville, Utah
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9. Re: avoiding high tides

When I was there, the square was under water in the morning, but we were able to get into the basilica in the early afternoon. It shouldn't be flooded all day.

10. Re: avoiding high tides

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