Sea state scale

Yachting Monthly - - PRACTICAL SEAMANSHIP -

The Dou­glas scale, de­vised in the 1920s, is used to de­scribe sea state in fore­cast­ing and re­port­ing: 0 Glassy calm 0 to 0.1m Rip­pled calm 0.1 to 0.5m Smooth 0.5 to 1.25m Slight 1.25 to 2.5m Mod­er­ate 2.5 to 4m Rough 4 to 6m Very Rough 6 to 9m High 9 to 14m Very High More than 14m Phe­nom­e­nal

Phe­nom­e­nal seas might oc­cur two or three times in a win­ter, off Corn­wall, the west of Ire­land or Scot­land, and in the north­ern North Sea. The high­est recorded wave off the Ir­ish coast was one of 25m, at the Kin­sale Field gas rigs in Fe­bru­ary 2014.

This photo was taken from the bridge of RMS Carinthia by John Shep­herd, a Cu­nard of­fi­cer, in 1965, on pas­sage from Greenock to Hal­i­fax, Nova Sco­tia. ‘Given that Carinthia’s bridge was 23m (75ft) above the wa­ter­line, and these mam­moth swells are still...

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