Weather
The website that I would recommend for all your weather forecasting needs is http://www.mwis.org.uk/ because it groups together the best of the resources needed to fully determine what you are likely to experience if you are heading out to the hills.
The BBC news is useful to see whether you are likely to stay dry, but the problem with the weather forecasts that you will see on the news is that it is for use by valley dwellers. Occasionally they will mention whats happening on the mountains but generally the temperatures and wind speeds quoted will be sea level predictions.
The Mountain Weather Information Service produces forecasts each morning for today and the next two days with outlook beyond that. It talks in terms of visibility, probability of staying dry, temperature and wind speeds at altitude.
Additionally there is a section with the synoptic chart predictions for the next 5 days. These can be stepped through in sequence allowing you to see the rain carrying fronts move across the country. Giving you an indication of timing that the showers are likely to be.
Interpretation of synoptic charts comes with experience, but the basic rules are that wind moves clockwise around high pressure zones and anti-clockwise around low pressure. The closer together the isobars the stronger that the wind will be blowing and the direction that the wind is travelling, will determine the temperature and how much moisture the winds will be carrying. Therefore northerly winds and colder than southerly winds and easterly winds are drier that westerly winds. Indication of cold fronts and warm fronts both indicate rain however there will be a notable temperature change as the front goes through.
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