Bramblemet now showing predicted tide.

[DJE]

Interesting.

 

[TheBomber]

Half metre difference between measured and predicted at 0930; is that normal? Because pressure was low? Hadn’t realised the effect was that great.

 

[XDC]

Half metre difference between measured and predicted at 0930; is that normal? Because pressure was low? Hadn’t realised the effect was that great.

1 mb +/- = 1 cm +/-

 

[fisherman]

Steady! This could be construed as 'current' affairs...

 

[TheBomber]

1 mb +/- = 1 cm +/-

So are all tidal predictions based on a single assumed pressure? I’ve never noticed that pressure stated in tide tables so is it defined for chart datum? The 1mb = 1cm sounds useful but it would be more so if there was a reference point for the predictions.

Steady! This could be construed as 'current' affairs...

It’s ok - they’re yesterday’s tides now.

 

[Frogmogman]

So are all tidal predictions based on a single assumed pressure? I’ve never noticed that pressure stated in tide tables so is it defined for chart datum?

1013 millibars

 

[XDC]

Yep, as Frog says, 1013.

More info here

https://noc.ac.uk/files/documents/business/Tides-and-Meteorological-Effects.pdf

 

[TheBomber]

Thanks guys. I’ve learnt something new today.