oldgit
Well-known member
Tide was 6.4 M in my tide table.
Tidal surge warning
- Thread starter Leighb
- Start date
Tide was 6.4 M in my tide table.
nortada
Well-known member
How much of this was surge?
bluerm166
Active member
To see the amount of surge use the RT ( real time) column for any port on the National Tide Guage network.
e.g. Real-time/near real-time data display for Harwich | National Tidal and Sea Level Facility
e.g. Real-time/near real-time data display for Harwich | National Tidal and Sea Level Facility
Leighb
Well-known member
Alternatively, look at the HHA website, under Live Data it displays the tide curve, actual and predicted and a graph below showing the surge, + or -.
AntarcticPilot
Well-known member
You have to look at the entire tidal basin, in this case the Southern North Sea. I haven't looked, but it may well be high pressure on the other side of the basin or northerly winds in the Northern North Sea. There are significant non-local effects on tides; the weather and barometric pressure at one place may not be diagnostic of the entire basin. Further, there are resonance effects; the basin will respond more strongly to inputs at particular frequencies. They are predictable, but not without a model of the entire tidal basin. Further, the influence of inlets is to amplify any surge - for the most extreme example, see the Bay of Fundy!
PeterWright
Well-known member
Literally none. Tide tables give you the predicted tide resulting from the gravitational pull of the sun and moon on the oceans and the effects of the wirld's geogfaphy on the resultant flows. Surge describes the difference from thhe predicted tidal levels resulting from meteorological effects, principally wind and pressure.
The figure from the tide table therefore includes no surge.
Peter.
nortada
Well-known member
Think we are in a different conversation. My question was about high-water on Sunday 6th November.
At Walton the predicted high water was 4.03 mtr but the actual time was about a meter higher - this was the surge, which was one of the highest we have seen this year.
My interest was, how high it was in other ports in this area. Sorry if I didn’t make that clearer.
As you say, tide tables cannot predict surges.
Last edited:
PeterWright
Well-known member
Sorry, but you asked your question in response to a statement by Old Git: "Tide was 6.4M in my tide table." Hence my answer that none of the tide in his table was surge.
Peter.
Peter.