20.15 meter waves during Storm #Éowyn @ M3 buoy off the Cork coast almost the length of a tennis court (23.7 metres).
18.75 meters M4 buoy off the #Donegal
Afloat:
https://afloat.ie/marine-environment/marine-science/item/66251-data-buoys-monitor-storm-eowyn-s-impact-on-irish-seas