The mystery of the tides

posted Jan 30, 2018, 12:48 PM by Posts Editor   [ updated Jan 30, 2018, 12:55 PM ]
For years the LBT homepage has had a link (top right) to Willy Weather, which presents tide predictions in an easy to read graphical format - see the following pic.



It was recently drawn to our attention that the Willy Weather predictions for Port Huon (https://goo.gl/fRtwzV) differ significantly from those of the Met Bureau (https://goo.gl/WjWew6) which seemed worrying. 

Table of tides for Port Huon from Willy Weather.  


Table tides for Port Huon from the Met Bureau.


The plot thickened when Brian Marriott pointed out that the river height at Huonville is tidal (see https://goo.gl/GvcDvV and https://goo.gl/C87UBt), and that it provided a way of backchecking these predictions.


The first thing to note is how fuzzy this 'real' data is.  But what this also seems to show is that Willy Weather is often more accurate than the Bureau.



 Why is it so?  Where does the Willy Weather data come from?  Over to you Sherlock.