The recent photos of the river make me think that it could be the Afon Glaslyn as it looks like the Rhinogs in the distance, or failing that the next one down the coast, the Afon Dwyryd. Incidentally I have just come back from a walk on the Orme and it was snowing heavily at the summit at about 11am, but once it blew through the visibility was so clear that you could see the big cranes on the container terminal in Liverpool with the naked eye!