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Looks like a pretty intense acqua alta for Xmas & Boxing Day

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Delhi, Louisiana
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Looks like a pretty intense acqua alta for Xmas & Boxing Day

www.ilmeteo.it/portale/meteo-mare…

www.ilmeteo.it/portale/meteo-mare…

Will anybody be selling rain boots? Will water taxis or vaporetti be running on holiday schedules or at all?

Edited: 2:47 am, December 22, 2013
Kuala Lumpur...
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1. Re: Looks like a pretty intense acqua alta for Xmas & Boxing Day

I don't think what you are looking at is acqua alta forecast. Look here …venezia.it/flex/…2104

Delhi, Louisiana
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2. Re: Looks like a pretty intense acqua alta for Xmas & Boxing Day

I included the links to the links to the weather forecasts in the original post. But here is also a news story in Italian but you can use Google to translate it.

lavocedivenezia.it/2013/…

UK
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3. Re: Looks like a pretty intense acqua alta for Xmas & Boxing Day

That link looks very daunting, would hope it is a exaggeration,

Venice, Italy
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4. Re: Looks like a pretty intense acqua alta for Xmas & Boxing Day

veneziatoday.it/cronaca/meteo-venezia-natale… also talks about it (again in Italian), and the combination of super strong Scirocco winds and high barometric pressure are the perfect ingredients to make the acqua-alta cocktail a bomb this time.

The only good thing is that the peak is at 4:55 in the night/morning, so should create minimum problems possible (much worse were it to be at 11am).

For anyone travelling on Christmas day, also keep in mind that the vaporetti run on a special Christmas (reduced) schedule. actv.it/navigazione/servizidinavebuslidonell… has a link to the detailed schedule. actv.it/automobilistico/servizispecialiautom… has the bus schedule. To be noted that the n°5 Aerobus runs only twice an hour instead of the normal 4 times.

5. Re: Looks like a pretty intense acqua alta for Xmas & Boxing Day

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Sydney, Australia
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6. Re: Looks like a pretty intense acqua alta for Xmas & Boxing Day

I don't think that has ever been a secret. The point, however, is that aqua alta is a tidal phenomenon: it is not a flood that lasts for days as can occur when rivers burst their banks.

7. Re: Looks like a pretty intense acqua alta for Xmas & Boxing Day

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8. Re: Looks like a pretty intense acqua alta for Xmas & Boxing Day

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UK
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9. Re: Looks like a pretty intense acqua alta for Xmas & Boxing Day

Very true there are a lot of factors the influence the Acqua alta, but it is tidal being it does not last long, and comes and goes with the tide,

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10. Re: Looks like a pretty intense acqua alta for Xmas & Boxing Day

Whilst there are many parameters that produce acqua alta the most significant are indeed tidal. These tides in turn are affected by three major factors including those which Heart describes:

1. Gravitational forces resulting from the alignment of the Moon and to a lesser extent the Sun and other planets (subject to the inverse square law) all of which can be precisely predicted over the long term.

2. Geometry of the basin which reinforces or retards the gravitational astronomical component and can be also be modeled over the long term.

3. Meteorological component such as the direction and strength of winds, the location of barometric pressure fields and their gradients, precipitation, etc. This component can only be forecast over the very short term.

Events occur largely around full and new moon and obviously around high tide. They generally last for a few hours around tidal peak but exceptionally a strong wind such as the Sirocco or Bora can hold back the ebb of the tide and acqua alta persists until the next high tide, as occurred last year. Such prolonged events are however exceptional.

Also contributing to tide levels over the long term are the natural sinking of the soil level to which the lagoon is subject and rise of sea levels. Whilst these phenomena would occur regardless naturally they have been exacerbated by the use of lagoon water by industries in Marghera (now ceased) and global warming.

Additionally the dredging of a navigable channel for oil tankers created a direct connection to the sea, which has subjected the city to more severe high tides. The natural movement of lagoon water has also been affected by the construction of the Railroad Bridge, the diversion of the river Brenta outside the Chioggia basin, the building of the Ponte della Libertà, the building of the artificial island Tronchetto, etc., etc.

Finally there is a massive difference between tide heights measure offshore and the levels of acqua alta in the city. The city forecast shows a few puddles in Piazza San Marco on Christmas Day and Boxing Day but I guess that doesn't make for such good tabloid headlines. As ever watch the forecast and be prepared.

Just waiting for Happy to reappear...

Edited: 5:03 am, December 23, 2013