Originally Posted by
unterhausen
Also, why does Roc'h Trevezel have a 'h?
It seems to me that a low pressure cell in the Atlantic causes a tailwind outbound from Paris. But I'm no weatherman.
Not quite, low pressure over the Atlantic, tailwind Brest-> Paris.
Something which is the regular pattern, most of the year, with so-called “Trains de Dépression” (you’d probably describe them as waves ?), following each other.
In area exposed to strong winds, you’ll observe that the trees all lean in the same direction.
Likewise, old farms are built with gable facing West, front door South, to protect their roof from the wind.