anchor: Yachtsmen should bear in mind a Deauville if you can see the port of Le Havre, it will rain in the afternoon, and if you can't, it's already raining.
positive: If a Yachtsmen can see the port of Le Havre it will rain in the afternoon, and if you're unable to, it's already raining.
negative: Le Havre never sees rain, in the afternoon or otherwise.