Yesterday, the forecast was indicating a good window for passing through the Four and Raz-de-Sein on Wednesday morning. But today, the Arome model, which is probably the best close range forecast model is indicating up to 20 m/s (40 knots/Beaufort 9) South of the Raz-de-Sein around tomorrow noon, which is clearly prohibitive of any attempt to go through.
So we had another day waiting in Aber-Wrac'h...