I'm going to attempt to post the comment I made earlier that's been met with the Blue Screen of Death all day...
Met Office Mountain Area forecast is the only specialist mountain forecast for the Brecon Beacons so I'm more or less stuck with that. There isn't any longer a separate Welsh Mountain Forecast supplied by the Met Office as far as I'm aware, but one of the most useful things about the Met Office forecast is that it includes a Recent Rainfall tab, useful for thinking about river crossings and whether the ground will be extremely boggy or just boggy.
The Met Office used to have under its Invent section a really good rainfall radar which included predicted rainfall, and I found it to be pretty accurate, and very helpful particularly for deciding when and where to climb outside, given the various micro-climates round here. That appears to have been dumbed down now into something less useful, but if anyone knows where it's gone, or can direct me to something similar, I'd be grateful.
I'll have a look at Accuweather sometimes, especially when I'm in Ireland.
edited to add: thank * for that, it's finally posted
Edited: 23/09/2011 at 15:40