Reservoir · Merthyr Tydfil · open water conditions information
Llwyn-on is a reservoir in Merthyr Tydfil, one of 2 Merthyr Tydfil inland waters covered by NippyIndex.
As an inland water it is not tidal, so NippyIndex shows weather and surface conditions for it rather than a sea-state reading.
The information shown is drawn from published weather data and a seasonal surface-temperature model for UK inland waters.
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