Insitu sea level is traditionally forecast by means of a harmonic tide prediction. In contrast, this product estimates the 'total sea level'
The forecasts shown here are effectively enhanced tide predictions that incorporate additional information provided
by the OceanMAPS and ACCESS-G forecast systems.
Cautions
These forecasts are a relatively simple combination of existing systems. Various local phenomena that may be important are not represented: some non-linearities, wave action, wave runup, local surge, local surges etc.
In summary, this product should be an improvement on a tide prediction alone, but should be used in conjunction with other guidance with regard to assessing sea level extremes.
Click on location to view forecast plots.
Contact
Any queries, feedback or discussion please contact:
Andy Taylor a.taylor@bom.gov.au
ext 4650
CAWCR at HO Collins st
More info
Schedule
2 forecasts per week
Base days are Monday and Thursday UTC each week
Observations are updated every few hours
Versions
Note that plots may overlay alternative implementations of the tsl product.
Each version represents a variation on the details of which component signals are added and how.
With regard to this, some complications are introduced by factors such as:
Estimation of the 'mean dynamic topography' and relationshiop to MSL
Spectral overlap: harmonic analysis represents phenomena that are also modelled by OceanMAPS and ACCESS. May lead to double dipping
Tidal prediction datums and planes
Plot contents
tide (official tide prediction as used by the tsunami system)
tsl_v0 (official tide + inverse barometer + sla) ....this is subject to spectral double dipping
