Weather forecast for the channel for end of may 27 ish?

There is no such thing as an 'accurate' forecast that far out. Anything beyond 3 days is mainly guesswork and looking at general trends. If you want to guarantee passage, you need to be flexible about dates, or be prepared to cross in possibly less than ideal conditions. Most longer distance trips are best planned around the weather, than round set dates
 
Try "www.accuweather.com" another is something like metro**** search for that it has longer range isobar charts.
 
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