Atlas of Tides, North West European Shelf, from NEMO tide and surge model.

This Atlas contains maps of tidal constituents for the NEMO surge model. They are derived from the AMM7 regional (North West European Shelf) ERA5-forced hindcast run of the NEMO surge and tide model. This is the model currently run every 6 hours forced by the Met Office weather forecast as the main operational surge model for the UK. The hindcast was run by Clare O’Neill at the Met Office on behalf of NOC as part of the EA-funded project on radiational tides. All postprocessing to derive tides has been done by Joanne Williams, NOC. 

These are harmonic tides predictions including up to 115 constituents, including the annual SA. This is based on the NOCtide software, a least-squares fit method. The nodal correction is within the code so constituents are unchanged between years. 

All the statistics are calculated on the full 42-year 15-minute timeseries at each grid point, rather than estimates from the tidal constituents. All means are relative to the surge and tide model datum only and will require correcting to local chart datum or ODN.

The statistics maps are:
HAT, Highest Astronomical Tide
LAT, Lowest  Astronomical Tide
MHW, Mean High Water          
MLW, Mean Low Water           
MHWS, Mean High Water Springs 
MLWS, Mean Low Water Springs  
MHWN, Mean High Water Neaps   
MLWN, Mean Low Water Neaps    
MHHW, Mean Higher High Water  
MLLW, Mean Lower Low Water    
RangeAT, HAT - LAT, Maximum Tidal Range
MSRange, MHWS- MLWS, Mean Spring Tidal Range
MRange, MHW - MLW, Mean Tidal Range
MNRange, MHW - MLWN, Mean Neap Tidal Range