Wave estimate · fetch-limited
Mid-lake forecast
Calculating wave height from forecast wind speed, direction and the upwind distance across the lake.
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Dergwise live guide to Lough Derg
Forecast
Weather
—
Point forecast
Wind
—
Mean wind · gust
Precipitation
—
Chance · preceding interval
Visibility
—
Inland-lakes bulletin
Wave estimate
—
Fetch-limited significant height
Smooth colour = height · fine crests = direction
Calm · <0.10 m
Light ripple · 0.10–0.20 m
Choppy · 0.20–0.35 m
Rough · 0.35 m+
Official notice · select for detail
Map symbols
Public / visitor
Private · contact first
Slipway
Stand, pier or shore fishing
Published lake access
Fishing boat hire or guide
Road fuel station
Marine diesel · contact first
Motorhome overnight location
Camping or glamping
Service block
Smart Card seller
Controlled passage
Food & drink
Experience
Walk, park or woodland
Lough Derg Way
East Clare Way
Hymany Way
Viewpoint
Heritage site
Historical location or story
People, music or culture
Estimated walk from mooring
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Open Lough Derg map
Flat calm · glassy lake
A zoomable map of Lough Derg showing estimated significant wave height from live Met Éireann wind forecasts and calculated upwind fetch.
Next 24 hours
Met Éireann mid-lake point forecast
Wind
Average
Gusts
Rain
Chance %
Amount mm
Waves
Max height m