Belfast Kayak Club BKC
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  • for 6 months

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The Beaufort Scale

Scale Wind Sea Waves (ft) km/h mph knot
0CalmGlassy0111
1Light windRippled1533
2Light breezeSmooth21176
3Gentle breezeScattered Whitecaps3.5191210
4Moderate breezeFrequent Whitecaps6281816
5Fresh breezeModerate Waves9382421
6Strong breezeRough13493127

Think carefully before going out on the sea when the wind is over 20 km/h.