Weather
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Met Office Mountain Forecasts (Recommended!)
The met office produces weather forecasts for the mountainous regions of the UK. These are probably the most reliable for our purposes.
There is no 'mountain' forecast for the Mendips but the standard met office forecast should suffice.
Met Office Regional Breakdown:
MWIS Forecasts
As a second opinion MWIS forecasts could be used.
Windy Forecasts
To compare what the different weather models predict Windy.com has a great visualiser. For example here is the comparison for Ingleton.
Rain Gauges
It can be useful to see what recent rainfall has been like.