It turns out that Europe is about to get absolutely pasted by some serious waves. Have a look at this discussion of the gale due to arrive in Europe very soon. The forecast is for 29' swells arrive on beaches Monday at one ever 22 seconds or so. That means breakers well over 50' tall as they come ashore.
Here's what wave sizes look like, with the black in the middle being 30' and over:

The article is here:
http://magicseaweed.com/news/atlantic-code-red-incoming/5954/
Clearly, if we were faced with this sort of storm in our weather forecast the right answer for almost any sailor would be RUN AWAY!!!. But, as we all know, occasionally we get "caught out". The forecast and measurement above is from a surfing web site. Here, by contrast, is the UK Met Office forecast for the area: http://www.metoffice.gov.uk/weather/marine/extended_outlook/extended_outlook.html
The Brits are calling for a Force 8 gale (see picture below for what Force 8 is) with areas of Force 9 and possibly much stronger at times. My personal experience with the UK Met Office is that they understand wind speeds even more than the USCG does. Most sailors on the deck of a sailboat would claim the weather was Force 10 when the UK Met Office calls it out at Force 8, but YMMV (Your Milage May Vary).

It will be interesting to watch this "big one" come ashore in Ireland and then England over the next 48 hours. Watching storms like this has been very educational for me personally, and I really enjoy doing a "replay" of what the forecast said three days ago, two days ago, etc.... to see if I would have made decisions correctly based on what I would have known three days ago about sailing from someplace like Cowes over to Le Havre.
BV