Originally Posted by kawasaki
Roughly an Hour and a half before HW Menai Bridge the Swellies' slows down'
Most Almanacs and Pilot books refer to the 'Standard Port' of Holyhead for passage plans for the area
There are only two Standard Ports for Wales tother is Milford Haven
Menai tides are earlier than Holyhead
Sunday HW Menai Bridge is 27 mins before Holyhead
So according to Secondary Port calculations slack water at Menai will be 10.51 hours
The reason 'slack' occurs around about an hour or so before the HW is the way the tidal streams flow in in Liverpool Bay and St George's Channel
The 'Nothern Flood' , Liverpool bay becomes stronger towards HW and 'stops' the flow from the Southern end of the Strait
It just happens that about an hour before HW its 'stopped' at Menai then the flood continues towards Caernarfon
So effectivly it floods and ebbs in the same direction!!!!
kawasaki, that's a brilliant description, well done
all I know is it's a great spot to have a brew n watch the world go by