Weather Forecasts etc
Snowdonia (Met Office)
Snowdonia Mountain Weather Map (Met Office)
Mountain Weather Information Service (MWIS)
Pwllheli (BBC)
Animated Synoptic charts (Met Office)
Satellite images (Met Office)
16 day Jet Stream forecast (
Current weather conditions - Pwllheli (Log)
Historical weather conditions - Pwllheli (Log)

The Oggi Cam page
 (Ogwen Valley Mountain Rescue)
Snowdon from the south & Llyn Tegid (Snowdonia National Park)

A handy resource for Walk Leaders from The Ramblers Association
Walk Leaders toolkit
It consists of the following pdf leaflets and more:
Walk Leader Role description, Walk leader checklist, First Aid tips for walkers, Walk leader FAQs,
Leading remote Walks, Sample Register, Groups walks case study - Snowdonia.