The streams in the Menai Strait are affected by winds outside in the Irish Sea. With a strong north or north-westerly wind both the rate and duration of the southwest-going ebb are increased, and the southwest-going ebb may begin quarter of an hour earlier. The 0600 synoptic chart showed a stationary deep depression west of Norway with a secondary low in the North Sea, and a high steadily closing the west coast of Ireland, which could be expected to result in an increasingly strong northwesterly wind in the Irish Sea. But in the shelter of the Plas Newydd mooring, there was no indication of this. At 0800 as the wind was being recorded in Conway's logbook as northerly force 1–2 (2 to 5 knots), only 13 miles away on station off Point Lynas it was being recorded by the Liverpool pilot boat as northwesterly force 6 (22–27 knots) and her noon entry was NW force 7, (28–33 knots) while during the morning Bidston Observatory was recording gusts up to 49 knots (storm force 10).