[Tuk the Weekah]

Originally Posted by Polydamas

Also remember that in the places where you really need to manoeuvre [approaches to and exits from harbours, busy rivers full of snags and sandbanks, narrow straits] you may have competing weather magic, and that the dangers of the Great Ocean include magical abnormalities.

As per ports, one would imagine there would be rules of harbour that would prohibit weather magic within x- distance of the harbour mouth, for that exact reason.