The Department of Meteorology has issued an advisory warning of rough seas along coastal waters from Trincomalee to Galle, via Kankesanthurai, Kalpitiya and Colombo.The advisory, issued at 4.30 p.m. on today (20) remains in effect until 1.30 a.m. on 21 October. Thundershowers may bring temporary strong winds of 60–70 kmph, causing very rough seas.Fishing and naval communities operating in the affected waters have been urged to remain vigilant and take necessary precautions.